Variable transmission composite interference filter

FIELD: physics, communications.

SUBSTANCE: filter comprises a first band-pass interference filter having a first dielectric layer placed between two reflective layers and a transmission band centred at a given wavelength and at a given angle, and a first transmission band shift. A second band-pass interference filter comprises a second dielectric layer placed between two reflective layers, having a transmission band centred at a given wavelength and at a given angle, and a second transmission band shift other than the first transmission band shift. A spacer is placed between the first and second band-pass interference filters. The difference between the first and second transmission band shifts results in less visible light transmitted through said composite interference filter at an angle of 45° to the given angle compared to the amount of light transmitted at the given angle through said composite interference filter.

EFFECT: reducing the amount of transmitted light while deviating the angle of incidence from a given angle.

16 cl, 8 dwg

 

RELATED APPLICATIONS

This application is a continuation application to U.S. patent No. 12/263441, filed October 31, 2008 included here fully by reference, and announces its priority in relation to the specified application.

The technical FIELD

The present invention relates in General to the field of filters, and in particular, bandpass interference filters used for selective transmission of the desired wavelengths of visible light.

The LEVEL of TECHNOLOGY

Device to filter the light with the selected wavelength, is well known and has been used for many years. In a typical case, the light from the white light source or light containing components with the wavelengths of the optical spectrum, filtered so that was only the desired wavelengths. Among the various traditional filters, commonly used as filters, can be called absorption filters and interference filters.

In one type of interference filters used in the dielectric layer, which have between two very thin layers of reflective material. The resulting filter passes light within a certain band of the visible spectrum. However, the wavelength range of the captured light is not constant for all angles of incidence. In a typical case, the bandwidth b the children to move with changing angle of incidence. Therefore, the visible color of the transmitted light can be varied by changing the angle of view of the observer. The wavelength of light and noise offset bandwidth is directly dependent on the thickness of the dielectric layer and the refractive index of this dielectric material.

Due to the presence of a large number of dielectric compounds from which to choose, and with the ability to control the dimensions of the various components with high precision can be produced such bandpass interference filters that pass light in a wide range of bands across the visible light spectrum.

Currently this technical field, requiring new kinds of filters, the advantage of which would be the production of useful filtering effects due to the use of the optical properties of conventional interference filters.

Device to filter the light with the selected wavelength, is well known and has been used for many years. In a typical case, the light from the white light source or light containing components with wavelengths from the spectrum of visible light is filtered so that was only the desired wavelengths. Among the various traditional filters, commonly used as filters, can be called absorptive filters interferention filters.

In one type of interference filters used in the dielectric layer, which have between two very thin layers of reflective material. The resulting filter passes light within a certain band of the visible spectrum. However, the wavelength range of the captured light is not constant for all angles of incidence. In a typical case, the bandwidth will shift with changing angle of incidence. Therefore, the visible color of the transmitted light can be varied by changing the angle of view of the observer. The wavelength of light and noise offset bandwidth is directly dependent on the thickness of the dielectric layer and the refractive index of this dielectric material.

Due to the presence of a large number of dielectric compounds from which to choose, and with the ability to control the dimensions of the various components with high precision can be produced such bandpass interference filters that pass light in a wide range of bands across the visible light spectrum.

Currently this technical field, requiring new kinds of filters, the advantage of which would be to provide useful filtering effects due to the use of the optical properties of conventional interference filter, the s.

The INVENTION

In accordance with the present invention here presented interference filters, combining the two band-pass interference filter in one composite interference filter.

Each of these two filters has at least one curve of the spectral bandwidth centered at the same wavelength of light incident at a given angle to the surface of the filter. However, the displacement curve of spectral transmittance of these components of the filter are different from each other, this reduces the amount of noise light when the angle of incidence deviates from the specified angle.

BRIEF DESCRIPTION of DRAWINGS

Figa is a graph showing the light transmission of the first interference filter at a given angle of incidence.

Fig.1b is a graph showing the light transmission of the first interference filter at an oblique angle of incidence.

Figa is a graph showing the light transmission of the second interference filter at a given angle of incidence.

Fig.2b is a graph showing the light transmission of the second interference filter at an oblique angle of incidence.

Figa is a graph showing the light transmission of the composite interference filter is of the present invention at a given angle of incidence.

Fig.3b is a graph showing the light transmission of the composite interference filter of the present invention at an oblique angle of incidence.

4 is a schematic view in section of a variant of implementation of the composite interference filter of the present invention.

5 is a schematic view in section of one possible implementation of a double-cavity interference filter according to the present invention.

DETAILED description of the INVENTION

Below are the description of embodiments of the present invention.

The present invention provides interference filters that can be used in a wide variety of applications, including, for example, use as a protective screen, which limits the full review zone through the window on which the filter.

Interference filters of the present invention is the composite filter comprising at least two band-pass interference filters, combined into a single composite filter. These two band-pass filter has a bandwidth of light that is centered on the same wavelength at the drop of the filter to the specified angle.

Figa is the first filter having a passband centered at the wavelength of the s X, for light incident at a given angle Z. Figa represents the second filter having a passband centered at the wavelength of X, for light impinging at the same given angle. On fig.1b presents the bandwidth for the filter shown in figa at an angle which is oblique relative to the angle Z. the bandwidth shown in fig.1b has "shifted" to the strip with respect to the bandwidth, is shown in figa, and is centered on a shorter wavelength than the wavelength X. On fig.2b representing the bandwidth of the filter figa at an angle of incidence of light that is different from the predetermined angle Z is the offset bandwidth on a different value.

Each of the filters shown in figa or 1b, in case of their traditional use will work as a filter, which passes roughly equivalent to the amount of light within shifting bands of the visible spectrum when changing the angle of the incident light. This effect can be observed, for example, in the form of a color change from yellow light to green light by moving the observer so that the angle of view has changed from the normal angle to the squint angle of view.

The filter design of the present invention combines at least two interference filter, such as the changing structure of the data on figa and 2A, the result is a composite filter that reduces the total number of the captured light as the deflection angle of the light from a given angle. On figa shows the spectral transmittance of light to one variant of the composite filter according to the present invention, when light is incident at a given angle Z. As can be seen in this drawing, the result of a combination of two filters is a filter that transmits light at a given angle of incidence in the band, representing the Union of (overlapping) frequency bands of filters, which are its components.

On fig.3b shows the effect achieved by the composite filter of the present invention in the case where the light falls at an oblique angle relative to the angle z As shown in this drawing, different offset values bandwidth of these two separate filters result in almost complete blockage of light transmittance in the applicable wavelength range.

The embodiments of the present invention that use two filters, as described above, can be used to obtain effective visibility at a normal angle of view through a composite filter, while simultaneously reducing visibility through the filter under oblique angles. For these embodiments "given" angle is the angle normal to the surface is tee filter, and light transmission will in General decrease with increasing deflection angle from the normal angle.

In other embodiments, the implementation of a given angle may be different from normal, and this difference can be up to 70°, in various embodiments, the implementation of the results of the filter to pass a very small amount of light at angles of incidence close to the normal corner, while allowing a significant amount of light to pass at angles of incidence that differ significantly from normal. In other embodiments, the implementation of a given angle can have any value in the range between normal angle and an angle other than normal to 60°, 50°, 40°, 30° or 20°.

In the following embodiments, the implementation of filters can be applied, with many peaks in its spectrum bandwidth, provided that at least one peak in each of the two filters demonstrates the properties described above and represented in these drawings.

To obtain the desired optical effect combine at least two of the interference filter to obtain a composite filter of the present invention, as shown generally under item 10 in figure 4.

As shown in figure 4, the first band pass interference filter 12 includes a first layer 16 of dielectric located the war between the two reflective layers 20. Close to the first band pass interference filter 12 include a polymer film 22. The second band pass interference filter 14 contains a second layer 18 of dielectric located between the two reflective layers 21. Close to the second band pass interference filter 14 include a polymer film 24. These two polymer films 22, 24 are optional components in these embodiments, implementation, and can be added in the form of a substrate on which are formed the above interference filters, or, for example, in the form of an additional protective layer. In those variants of implementation, in which the polymer films are used as substrates, these polymer films 22, 24 may include a first layer which forms a component, which is reflective layer of the interference filter. In various alternative embodiments, the implementation instead of the polymer films 22, 24 can be used in hard coating layers, and in still other embodiments, the implementation instead of the polymer films 22, 24 can be applied to a rigid substrate, such as glass or hard plastic. The layers of the hard coating can also be applied as the first layer or the alignment layers between the band-pass interference filter and the substrate, on which he formiruete is.

Between the two interference filters have a separation strip 15, which may consist of any appropriate material and the role of which will be described in detail below.

The resulting composite filter 10 will demonstrate the combined filtering effect of the joint work of both band-pass interference filters, reflected in the fact that the noise light can be seen in the full range of angles, as described above.

An implementation option, shown in figure 4, can be modified to obtain subsequent embodiments by adding additional layers to the first band pass interference filter 12, the second band pass interference filter 14, or to both. In various embodiments implement one or both of the filters modify by adding one or more additional dielectric and reflective layers. Figure 5 shows one such option exercise. As shown in figure 5, two-resonator bandpass interference filter 26 includes the first dielectric layer 28, the second dielectric layer 30 and the three reflecting layer 32. As in the above-described variants of implementation, an optional layer 34 of the polymer film may be included as meanly the key, on which is formed a filter, or as a protective layer.

Two-resonator filters, such as those described above, can be used in composite filters of the present invention instead of one or both of the resonator filter shown in figure 4.

In addition to the two-resonator filters where applicable, instead of one or both of the interference filters in the composite filter of the present invention can also be applied band-pass interference filters containing three or more dielectric layers and the respective reflecting layers.

In accordance with this description of the two band-pass interference filter in combination with a dividing strip or no strip, as in some embodiments, implementation, can be combined to obtain a composite filter of the present invention, if the full amount of noise visible light at an angle of incidence of 45 degrees to the specified corner (where the centers of the two curves are combined) does not exceed 80% of the noise visible light at a given angle. In some embodiments, implementation of the full amount of noise visible light at an angle of 45 degrees to the specified corner (where the centers of the two curves are combined) is less than 60%, 40% or 20% noise visible light at a given angle.

In other embodiments, implementation of the present invention the above figures (values) refer to the infrared range of the electromagnetic spectrum, to ultraviolet range or to other ranges and filters according to the present invention can be used in combination with an infrared remote control devices, communication devices, or any device, using any part of the electromagnetic spectrum, for which you can use variable transmission according to the present invention.

Interference filters of the present invention can be used in a wide variety of applications of optical filters, for example, to callmerobbie light, suppression of light or for counterfeiting.

POLYMER FILM

Polymer film shown in figure 4 as elements 22 and 24 described herein may represent any suitable thermoplastic film used in applications that require optical film. In various embodiments, the implementation of such a polymer film can contain polycarbonates, acrylic fibers, nylon, polyesters, polyurethanes, polyolefins, such as polypropylene, cellulose acetate and cellulose triacetate, vinyl acetate such as poly(vinyl has butyral), polymers of vinyl chloride and copolymers and the like, or on the natives plastic, used for the optical film.

In various embodiments, implementation of the present invention the polymeric film presents a film of polyester such as poly(ethylene terephthalate). In various embodiments, implementation of the present invention the polymeric film may have a thickness from 0.012 mm to 0.40 mm, preferably from 0.025 mm to 0.1 mm or 0.04 mm to 0.06 mm

The polymeric film may include, where applicable, the primary layer, contributing to the binding plated layer with a polymeric substrate to provide strength to the substrate and/or improve the flatness.

Applied polymer films typically are optically transparent (i.e. objects located near one side of the layer, the observer can easily see by looking through this layer on the other side). In various embodiments, implementation of the present invention the polymeric film contains materials such as re-stretched thermoplastic film having these properties, including polyesters. In various embodiments, implementation of the present invention is applied poly(ethylene terephthalate), and in different variants of implementation of the present invention poly(ethylene terephthalate) biaxially stretch for increased strength, and are subjected to tests to characterize low is th strivesto when exposed to elevated temperatures (for example, less than 2% retraction in both directions after 30 minutes of exposure at 150°C).

The preferred polymeric film is poly(ethylene terephthalate).

As used in the description and shown in the drawings, the term "polymer film" includes a multilayer structure, and the single-layer and coextrudable film. For example, as polymer films of the present invention can be used two or more separate polymer layers which have eliminirovali, compressed, or otherwise connected with each other for the formation of a uniform film.

Applicable with the present invention, examples of polymer films include are described in U.S. patents 6049419 and 6451414, as well as in U.S. patent 6830713, 6827886, 6808658, 6783349 and 6569515.

For those embodiments of the present invention, in which a polymer film is used as a dividing strip, the thickness of the polymer film can be taken the same as for other described here, the dividing strips.

DIELECTRIC LAYERS

The dielectric layers of the present invention can include any suitable materials known in the field. To applicable dielectrics include silicon dioxide, titanium dioxide, magnesium fluoride and zinc sulfide. In preferred embodiments, the implementation of the present invention in two ignores naturnah interference filters, which components of the composite filter of the present invention, are the following pairs of dielectrics: TiO2or Nb2O5- for the first filter and SiO2, MgF2That YF2for another filter. In General, preferred are a pair of dielectric refractive indices which differ significantly from each other. In various embodiments, the implementation of this difference is one unit or more.

The dielectric layers of the present invention can be formed with a thickness appropriate to provide the desired filtering effect. In various embodiments, the implementation of the thickness of the dielectric layers may comprise two or more quarters of the waves. In various embodiments, the implementation of the thickness of the layers in the pair can be from 340 to 420 nanometers, for example, for a layer MgF2and from 160 to 240 nanometers, for example, for a layer of TiO2.

The dielectric layers of the present invention may have any appropriate combination of high/low refractive index, for example greater than 2 and less than 1.8 and more than 2.2 and less than 1.5.

The dielectric layers of the present invention can be formed using any acceptable method known in this field, for example, using methods of chemical or physical vapour deposition, such as thermo is goodnoe evaporation or sputtering. Various technology layers described in the "Handbook of processes and equipment for deposition of thin films", edited by Klaus K. Sugriva, publisher Noyes (Handbook of Thin-Film Deposition Processes and Techniques, edited by Klaus K. Schuegraf. Noyes Publications).

REFLECTIVE LAYERS

Reflecting layers of the present invention are well known in this field and include any suitable metal composition. In various embodiments, the implementation of the reflecting layers of the present invention contain a material having high reflectivity with respect to infrared radiation. Examples include silver, gold, aluminum and copper, and their alloys. High reflectance with respect to infrared radiation is required in many applications to avoid the passage of heat through the filter, for example, those variants of implementation, in which the filtered light from incandescent lamps. The reflected infrared radiation is also a desirable characteristic for heat-sensitive substrates, such as poly(ethylene terephthalate).

Reflecting layers of the present invention can be formed by any acceptable method, such as sputtering, and they can be of any reasonable thickness.

Multiple reflecting layers of the present invention may consist of the same material or from asnyk materials, and may have the same thickness or different thicknesses in accordance with a specific embodiment of the present invention.

In preferred embodiments, the implementation of the present invention the metal reflecting layers contain silver or silver alloys.

DIVIDING STRIP

The dividing strip of the present invention can include any laminating adhesives, or layers of polymer film or combinations thereof. In addition, the separating strip can include glass and hard plastic layers, such as polycarbonate layers and other appropriate rigid substrate.

Laminating adhesives include those species that are traditionally used in this area for adhesion of the films to each other, for example (without limiting), poly(vinyl has butyral), polyurethane, silicone, etc.

The dividing strip of the present invention include combinations of polymer films and laminating adhesives. In some embodiments, implement, for example, two of the interference filter can be formed on two separate substrates made of polymer film elements 22 and 24 in figure 4), and then be laminated to the strip of polymer film using the adhesive, in this case laying on a polymer film and an adhesive substance to form a divide is inuu gasket. Layers of the polymer film include everything mentioned in this description.

In other embodiments, implementation of the present invention, the separating strip can be formed using only the polymer film is required for separation of the strip thickness, for which a band-pass interference filters formed directly on one polymeric film. In these embodiments, the first band pass interference filter is formed on one surface, and the second band pass interference filter is formed on the opposite surface of the polymer film. Then open (due to impact) surface filters can be protected with a layer of a polymeric film or solid coating known in this field of technology. Polymer film for the barrier strip may include, if necessary, the primary layers.

The dividing strip of the present invention can have any suitable thickness, and in various embodiments, the implementation of the dividing strip has a thickness of at least seven quarters wavelength optical thickness. In various embodiments, the implementation of the dividing strip has a thickness of from 0.8 to 1.2 microns.

The dividing strip of the present invention may also be what combinatii of the above materials. For example, a dividing strip can be a combination of glass and polymer films, and one or more polymer films bonded to the glass. The dividing strip of glass and hard plastics of the present invention can have any suitable thickness, and, in a different implementation, such a dividing strip may have a thickness up to 1 mm, and in other embodiments, implementation of the thickness may exceed 1 millimeter.

Composite filters of the present invention can be used effectively in many applications, for example (without limiting), as filters glued to the Windows and glass, as color filters for various applications in lighting, in applications to combat counterfeiting, as directional filters, etc.

The present invention allows to create a composite interference filters, enabling variable filtering light in a certain range of angles. Among the many advantages of composite filters can be called the ability to maintain confidentiality, which cannot be seen through the hole while passing inside a quantity of light falling below the acceptable angles.

The present invention is described with reference to examples of variants of its domestic who, however, qualified specialists in this field will be clear that they can make various changes and replace them with elements of equivalents without departure from the scope of the invention. In addition, it is possible to make many modifications to adapt a particular situation or material to the ideas of the present invention without going beyond it. Therefore, it is understood that the present invention is not limited to specific variants of its implementation, is presented as the best means for its implementation, however, the present invention is to cover all variations in its implementation, is not beyond the scope of the appended claims.

Will also be understood that any range of values, quantities or specifications submitted for any component of the present invention, can be used interchangeably with any ranges of values, quantities or specifications submitted for any of the other components of the invention, compatible with the first, which gives the opportunity to get an implementation option with specific values for each of the components, as presented in this description.

All reference position mentioned in the abstract or in any of the claims are only for illustrative purpose and should not limit the volume of the m invention to any particular embodiment, shown in any drawing.

Drawings made not to scale, unless otherwise specified.

All reference materials, including journal articles, patents, patent applications, and books, to which it made reference, fully included here by reference.

The present invention is described and shown with reference to examples of its implementation, however, qualified specialists in this field will be clear that they can make various changes in form and details, and it will not be considered a violation of the scope of the present invention defined by the attached claims.

1. The composite interference filter including:
the first band pass interference filter containing first dielectric layer located between the two reflective layers, with said first band pass interference filter has a bandwidth centered at a given wavelength and at a given angle, and has a first offset bandwidth;
the second band pass interference filter that contains a second dielectric layer located between the two reflective layers, while the second band pass interference filter has a bandwidth centered at a given wavelength and at a given angle, and who meet the second offset bandwidth, different from the first offset bandwidth;
and
separating gasket located between the first and second band pass interference filters, and the difference between the first offset bandwidth and the second offset bandwidth reduces the amount of visible light passed through the composite interference filter at an angle of 45° to the specified preset angle, relative to the amount of visible light, noise at a given angle through the composite interference filter.

2. The composite interference filter of claim 1, wherein said first dielectric layer has a dielectric selected from the group consisting of TiO2and Nb2O5.

3. The composite interference filter of claim 1, wherein said second dielectric layer has a dielectric selected from the group consisting of SiO2, MgF2That YF2.

4. The composite interference filter of claim 1, wherein the specified separator strip contains an element selected from the group consisting of adhesives, poly(ethylene terephthalate), and air.

5. The composite interference filter of claim 1, wherein the specified reflective layers containing an element selected from the group consisting of silver, gold, aluminum and copper.

6. The composite interference filter of claim 1, wherein said first dielectric layer contains a material having a refractive index greater than 2, and the second dielectric layer contains a material having a refractive index less than 1.8.

7. The composite interference filter of claim 1, wherein said first dielectric layer contains a material having a refractive index greater than about 2.2, and the second dielectric layer contains a material having a refractive index less than 1.6.

8. The composite interference filter of claim 1, wherein the difference between the first offset bandwidth and the second offset bandwidth leads to a reduction of at least 65% transmittance of visible light through the composite interference filter, the incident angle of 45° to a preset angle relative to the transmittance of visible light through the composite interference filter, falling under the specified angle.

9. The composite interference filter of claim 8, in which the difference between the first offset bandwidth and the second offset bandwidth leads to a reduction of at least 80% transmission of visible light through the composite interference filter, the incident angle of 45° to a preset angle, with respect to PR is to pass visible light through the composite interference filter, falling under the specified angle.

10. The composite interference filter of claim 1, wherein the specified separator strip contains laminating adhesive.

11. The composite interference filter of claim 1, wherein the specified separator strip contains polymer film.

12. The composite interference filter of claim 1, wherein either the first or second mentioned band-pass interference filters contains a two-resonator filter.

13. The composite interference filter of claim 1, wherein both the first and second mentioned band-pass interference filters contain two-resonator filters.

14. The composite interference filter of claim 1, wherein said first band pass interference filter has more than one peak bandwidth.

15. The composite interference filter of claim 1, wherein each of the first and second mentioned band-pass interference filters has more than one peak bandwidth.

16. How to change the spectrum transmittance of electromagnetic radiation through the hole containing the steps:
provide a composite interference filter containing:
the first band pass interference filter containing first dielectric layer located between the two reflecting the layers, while said first band pass interference filter has a bandwidth centered at a given wavelength and at a given angle, and has a first offset bandwidth;
the second band pass interference filter that contains a second dielectric layer located between the two reflective layers, while the second band pass interference filter has a bandwidth centered at a given wavelength and at a given angle, and has a second offset bandwidth, different from the first offset bandwidth; and
separating gasket located between the first and second band pass interference filters
but such a difference between the first offset bandwidth and the second offset bandwidth reduces the amount of visible light passed through the composite interference filter at an angle of 45° to the specified preset angle, relative to the amount of visible light, noise at a given angle specified composite interference filter; and
skip the specified electromagnetic radiation through the composite interference filter at a given angle; and
skip the specified electromagnetic radiation cher is C specified composite interference filter at an angle of 45° to the specified preset angle.



 

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FIELD: physics, optics.

SUBSTANCE: tunable optical filter with Fabry-Perot interferometre has transparent plates with mirror coatings with spacing in between. When making the said optical filter, a sacrificial layer is deposited on one plate with the mirror coating. A mirror coating is then deposited on top and the second transparent plate is attached through a layer of hardening material. After that the said plates are attached to holders through a hardening material and the sacrificial layer is removed through evaporation by heating to temperature below the thermal destruction temperature of the hardening layer.

EFFECT: easier obtaining of controlled spacing between plates, avoiding use of special methods of obtaining surfaces with high degree of flatness, avoiding the need to monitor the value of the spacing and its wedge.

1 dwg

FIELD: optical engineering.

SUBSTANCE: at least two dielectric layers are produced with preset thickness. Layers are disposed one onto the other to form pack of layers. Thickness of layer packs is subject to reduction and thicknesses of separate layers are similarly reduced by means of deforming layer packs to keep relation of thicknesses or relation of thicknesses of layers. Layer pack is disposed between two carrying layers before subjecting the layers to deformation. At least one carrying layer is formed from several separate layers, which are supposed to be disposed subsequently at the end of process of partial deformation at any previous layer of carrying layer. Separate layers of carrying layer can be overlayed onto previous separate layers of carrying layer.

EFFECT: simplified process of manufacture; improved reflection factor.

22 cl

Reflecting surface // 2256942

FIELD: optical instrument engineering.

SUBSTANCE: invention can be used for wide-band light reflecting. Reflecting surface has dielectric layers A, B and C. A layer is made of material having low refractivity, B layer is made of material with average refractivity and C layer is made of material having high reflectivity. Optical thickness of layers equals to λr/4, where λr is wavelength of middle part of interval having high refractivity. Sequence of layer alternation looks like (CDCABA)KCBC, where K>=and has to be integer. Spectrum range with high reflectivity is widened due to shift in adjacent bandwidths at opposite sides along wavelength scale.

EFFECT: widened spectrum range with higher refractivity.

5 dwg

FIELD: optical engineering.

SUBSTANCE: device can be used for getting image from space, including surface of Earth, from space and from different sorts of air carriers. Device has at least one information channel which channel has objective, filter and multi-element receiver. Filter is made of two lenses, which lenses form flat-parallel plate. Lenses are made of the same material with equal radiuses of curvature of their spherical surfaces. Interference coatings are applied onto spherical surfaces, which coatings form, together with material of lenses, spectral range of device. Filter can be installed between objective and radiation receiver. In this case the first lens is made flat convex, the second one is flat concave. Center of radius of curvature of spherical surface of flat-convex lens is brought into coincidence with center of exit pupil of objective. Filter can be installed in front of objective.

EFFECT: constancy of borders of spectral sensitivity and of level of transmission within total area of angle of view; improved precision of measurement.

7 cl, 3 dwg

FIELD: optical instrument engineering.

SUBSTANCE: optical filtering device can be used for building devices for spectral filtration of optical images, for example, for wavelength re-tune optical filters, IR imagers working within specified narrow spectral ranges. Filtering device being capable of re-tuning within preset wavelength range is based upon interferometers. Interferometers are disposed along path of filtered radiation flow at different angles to axis of flow. Reflecting surfaces of plates of any interferometer, which plates are turned to meet one another, are optically polished and they don't have metal or interference mirror coatings. To filter selected wavelength of λm; the following distances among reflecting faces of interferometers: d1=(λm/2)k, k=1 or k=2, dn=(n-1)d1 or nd1. Filtering device is equipped with different filters which cutoff radiation outside borders of range to be filtered, including filters which are made of optical materials being transparent within band of spectral characteristic of sensitivity of consumer's receiver, which receiver registers filtered radiation. Filter cutting off short wavelength radiation is made of materials, which form border with positive derivative of dependence total internal reflection angle depending on wavelength. Filter cutting off long wavelength radiation is made of materials which form border with negative derivative of angle of total internal reflection depending on wavelength.

EFFECT: improved stability of parameters; increased transmission ability in maximal points of bands and reduction in number of transmission bands; increased relative aperture; higher quality of filtration; reduced number of side maximums.

4 cl, 5 dwg

FIELD: narrowband filtration covers.

SUBSTANCE: narrowband filtration cover contains two systems of alternating dielectric layers with different refraction coefficients and equal optical thickness λ0/4, in the form of high reflection mirrors, and a dielectric layer dividing them. In accordance to the invention, structure of high reflection mirrors additionally features dielectric layers with intermediate value of refraction coefficient and dividing layer has optical thickness λ0 or one divisible by it, and sequence of layer alternation has form (CBCABA)KD(ABACBC)K with nA<nB<nC, where refraction coefficient of dividing layer nD is not equal to nA (for example, nD=nC) and k≥1 is an integer number, where: λ0 - maximal filtration cover throughput wave length; A, B and C - dielectric layers with values of refraction coefficient nA, nB and nC respectively, and D - dividing layer.

EFFECT: increased selectivity due to expansion of high reflection bands on the sides of pass band.

5 dwg

FIELD: fiber-optic transmission systems.

SUBSTANCE: optical multilayer filter has N dielectric layers made of materials with different refractivity. Optical thickness of any layer equals to λ/4, where λ average wavelength of transmission band of optical filter. Optical multilayer filter is composed of input optical transformer, selective part and output optical transformer. Level of signal distortions is reduced till preset value for wide range of frequency characteristics of decay of filter within preset transmission band and decay is improved within delay band till preset value.

EFFECT: widened area of application.

5 dwg

FIELD: fibre-optic communication, optical multilayer filters.

SUBSTANCE: optical multilayer filter (OMLF) consists of an input optical transformer (In. OT 1), a selective part (SP 2), and output optical transformer (Out. OT 3) and substrates 5, 6. The In. OT 1, SP 2, and Out. OT 3 consist of NIn=2s, Nsp=4k and Nout=2r alternating layers 7 and 8, respectively, with high nh and low nl values of refractive indices of materials they are made of. The thickness of every layer d=0.25λ, where λ is the mean OMFL bandwidth wave length. Refractive indices of adjoining layers of the In OT and SP, and those of SP and Out.OT are equal. Note that the SP alternating layers are made from materials with refractive indices mirror-symmetric relative to the SP centre. The first layer of In. OT and the last layer of Out. OT are connected to substrates. Proposed are the relations to calculate the parameters of claimed arbitrary type OMLF.

EFFECT: reduction of signal distortion to preset magnitude in a wide frequency range of the filter attenuation in the preset bandwidth and increase in attenuation to the preset magnitude that allows wider application of the aforesaid filters.

3 cl, 7 dwg

FIELD: physics.

SUBSTANCE: invention concerns area of optical thin-film coatings. The spectral divider contains the optical interference system with alternating quarter wave layers; part of them has an optical thickness not multiple to quarter of length of an emission wave. The spectral divider design allows obtaining the optimised spectral characteristics having small fluctuations of the transmittance factor in a working range of transparency.

EFFECT: spectral divider can be used at a direct and inclined light ray tilt angle in various geodetic devices and special purpose devices.

2 cl, 4 dwg

FIELD: physics, optics.

SUBSTANCE: tunable optical filter with Fabry-Perot interferometre has transparent plates with mirror coatings with spacing in between. When making the said optical filter, a sacrificial layer is deposited on one plate with the mirror coating. A mirror coating is then deposited on top and the second transparent plate is attached through a layer of hardening material. After that the said plates are attached to holders through a hardening material and the sacrificial layer is removed through evaporation by heating to temperature below the thermal destruction temperature of the hardening layer.

EFFECT: easier obtaining of controlled spacing between plates, avoiding use of special methods of obtaining surfaces with high degree of flatness, avoiding the need to monitor the value of the spacing and its wedge.

1 dwg

FIELD: physics.

SUBSTANCE: fibro-optical connector comprises first and second half-couplings to receive first and second sections of optical fiber. First and second pairs of step-down optical multilayer transformers are arranged on end faces of said sections. Air gap is arranged between outer layers of said first and second pairs of said transformers. Layers of first and second pairs of aforesaid transformers are made from materials with differing indices of reflection and are counted from outer layers of aforesaid transformers in direction of the end faces of connected sections of optical fiber. Thickness of every layer makes one fourth of average signal wave λ0 transmitted over optical fiber, while the number of layers is selected subject to conditions covered by invention claim.

EFFECT: reduced power loss, expanded performances.

4 cl, 9 dwg

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