Optical beam splitter in form of composite dichroic prism

FIELD: physics, optics.

SUBSTANCE: invention relates to optical instrument-making and an optical beam splitter. The optical beam splitter is a composite dichroic prism and is made in form of several transparent prisms glued together. The transparent prisms have on one face at the gluing point a dichroic coating intended for reflecting different frequency components of incident radiation. The shape and mutual arrangement of the transparent prisms is selected based on the condition of intersection of glued planes at one point.

EFFECT: higher compactness of the structure.

3 dwg

 

The use of

The invention relates to optical spectral devices using the decomposition of the light beam into multiple spectral components or using the addition of radiation from light sources with different spectral components in one bundle.

Prior art

Multicolor photometry requires the measurement of several portions of the spectrum that can be done or sequentially, in turn changing the required filters in the optical path of the photometer, or simultaneously, dividing the analyzed beam of light into multiple colored beams and directing each in its measuring channel. Most currently used photometers implements the first method of measurement because it requires minimum hardware cost: one photodetector, one amplifier, one recording device, and has the flexibility to specific Supervisory task.

Multi-color photometer with simultaneous measurement of the investigated flow in several spectral bands is structurally more complex, but has a number of advantages: reduced costs, time information, you can get an instant color quick-variable objects and secure the color of objects when not very good weather conditions, you can apply optimal the e for each spectral channel photodetectors. For this reason, various authors have repeatedly proposed multi-color multi-channel photometers, in which the luminous flux from the measured object shared between spectral channels using diffraction gratings, prisms or dichroic mirrors. For spectral analysis of images of the latter are adapted to the greatest extent. In this case, each channel is virtually all of the radiation corresponding to the spectral range, and the device is suitable for simultaneous multi-color dimensions weakly illuminated objects in complex background conditions.

Because the present invention is directed to the spectral analysis of images quickly proceeding processes, the prior art further considered in the field of beam-splitting systems on the basis of dichroic coatings, thin-film structures, which in some spectral range Δλ reflect almost all the light and let the rest of the radiation. Dichroic optical beam divider (OLD) represents a structure of alternating thin film layers of dielectric with high and low refractive indices deposited by vacuum deposition on a transparent substrate. The total number of layers of dichroic OLD is usually 20-30 depending on the requirements of the shape of the curve is tragedia (bandwidth) and to the working frequency range.

Most often, the OLD do as inclined at an angle to the incident beam of plane-parallel glass plates with multilayer-coated surface (US 8405048, G01J 1/58, 2009 [1] is similar). The disadvantage of plane-parallel glass plate as the basis for the deposition of multilayer coatings is the color flare in the direction of the reflected rays as a result of multiple reflection inside the plate. For this reason, the preferred beam-splitting prisms.

Known included in the spotlight of the OLD in the form of triangular dichroic prism output collecting face and a semi-transparent dichroic mirror coating on the other two, is designed to reflect different frequencies in the optical range of electromagnetic waves (US 6082863, G03B 21/14, 2000 - [2] - equivalent). This OLD does not glare, as in flat dichroic mirrors [1], but may not collect or arrange luminous flux if there are more than three of its frequency component.

Famous OLD as team dichroic prism (PSD) that contains the input or output face for respectively input or collect the total luminous flux and at least one bonding adjacent faces of at least two components specified dichroic prism transparent prisms with dichroic coating on one facet in place of each bonding to reflect this coverage depending on the angle with a luminous flux of different frequency components (http://ru.wikipedia.org/wiki/ [3] - similar). This OLD can decompose or collect luminous flux with an arbitrary number of frequency components. The disadvantages of [3] can be attributed to the fact that output or input beams of the light flux with different frequency ranges are not completely fill the volume of the PSD and have inside of a various length of the optical path (Fig. 1). This spectral component, cut one dichroic mirror, does not interact with another dichroic mirror, if their working band of wavelengths do not overlap.

Famous OLD in the form of a PSD that contains the input or output face for respectively input or collect the total luminous flux and at least one bonding adjacent faces of at least two components specified dichroic prism transparent prisms with dichroic coating on one facet in place of each bonding to reflect this floor, depending on the angle with a luminous flux of different frequency components (patent US 6327092, G02B 27/14, 2001 [4] - prototype). According to [4] geometry and mutual arrangement of the prisms constituting after gluing team dichroic prism is selected from the condition of intersection of the planes of the location of these cuts on the line. This, with the bulk symmetry PSD, makes the OLD design more compact.

Disclosure of inventions

The objective of the invention is to Powys the th efficiency of OLD, made in the form of SDP. The technical result of the invention is to create the most compact design PSD with a symmetrical arrangement of an arbitrary number of keywords. light component.

The specified task and the technical result is ensured by the fact that in the OLD in the form of a PSD that contains the input or output face for respectively input or collect the total luminous flux and at least one bonding adjacent faces of at least two components specified dichroic prism transparent prisms with dichroic coating on one facet in place of each bonding to reflect this floor, depending on the angle with a luminous flux of different frequency components, according to the invention, the geometry and mutual arrangement of the prisms constituting after gluing team dichroic prism is selected from the condition of intersection of the planes of the location of these cuts at one point.

A causal relationship between the features and achievable technical result is that the intersection of the planes of the location of splices at one point ball provides volumetric symmetry PSD, creating the greatest possible compactness OLD.

A brief description of the illustrations

In Fig. 1 schematically OLD according to the analogue of [3], Fig. 2 - scheme Of The D according to the invention with receivers derived from it frequency component; in Fig. 3 - scheme of the same OLD on a larger scale with the axonometric image of the intersection of the planes of the location of splices prisms PSD at one point.

Detailed description of the device

OLD as PSD 1 contains in this example (Fig. 2-3) of the input face 2 to enter the total luminous flux 3 and N cuts...2 2.1.N adjacent faces falling into the dichroic prism of transparent prisms with dichroic coating on one facet in place of each of the specified bonding to reflect this floor, depending on the angle with a luminous flux of different frequency components 3.1...3.N total luminous flux 3. Geometry and mutual arrangement of the prisms constituting after gluing PSD, selected from the condition of intersection of the planes of the location of these cuts at one point 4 (Fig. 3). In particular, PSD radial divider of Fig. 2, 3 is a transparent cube, cut six planes on six pyramidal prisms. On each plane 2.1...2.5 obtained prisms caused his dichroic coating, and then produced the bonding is obtained by cutting cube prisms in SDP 1 with the input face 2 located at an angle of 45° with respect to the incident beam 3. Faces of prisms with adhesions 2.1...2N oriented relative to each other with the same or different spatial angles α (Fig. 2) based on the C required frequency bands of the light component, reflected by the dichroic coatings, and the convenience of the output of the divider or by typing in the appropriate rays...3 3.1.N. On the path of these rays is set accordingly photodetectors or photoslittle 5.1...5.N (Fig. 2). Between each photodetector 5.1...5.N and the corresponding output line SDP is set collecting lens (not shown). The maximum number of frequency components at the output of the PSD, you can ensure you are running the latest in the form of faceted sklonnogo ball with an arbitrary number of prisms (not shown).

The operation of the device

The OLD according to the invention is as follows. Initial luminous flux 3 is applied to the input face 2 PSD 1. The bandwidth of each frequency component 3.1...3N, reflected by the dichroic coating adhesions 2.1...2N, depends on the angle of the degradable components of the beam relative to the plane of the corresponding bonding with dichroic coating. Passing through the output face PSD frequency components 3.1...3N through a collecting lens serves on the photodetectors 5.1...5.N. The OLD in the opposite direction when collecting frequency component from emitters 5.1...5.N is similar.

Industrial application

The proposed OLD can be used in spectroscopy to highlight certain spectral component, video or photographic technique for the division of the exposed image on the three basic colors, for the spectral composition of a light beam projector systems, laser TVs, medical endoscopes, etc.

Optical beam splitter in the form of team dichroic prism containing the input or output face for respectively input or collect the total luminous flux and at least one bonding adjacent faces of at least two components specified dichroic prism transparent prisms with dichroic coating on one facet in place of each bonding to reflect this floor, depending on the angle with a luminous flux of different frequency components, characterized in that the geometry and mutual arrangement of the prisms constituting after gluing team dichroic prism is selected from the condition of intersection of the planes of the location of these cuts at one point.



 

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