The wavefront sensor |
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IPC classes for russian patent The wavefront sensor (RU 2046382):
     
 The method of illumination of the object / 2040032
The invention relates to applied optics, and more specifically to optical holography, and is intended to create optical displays a new type
 The way you write rainbow holograms / 2040031
The invention relates to optical holography and is designed to produce fine, coding and promotional holograms, restored in white light
The way you write rainbow holograms / 2040031
The invention relates to optical holography and is designed to produce fine, coding and promotional holograms, restored in white light
 Narrow-band selector on the basis of the reflective phase of the three-dimensional hologram / 2035766
The invention relates to holography
 A method of manufacturing a recording medium for recording volume holograms / 2035765
The invention relates to three-dimensional holography, more specifically to a recording media for holography, and can be used to create a volume holographic recording media, working on various physico-chemical mechanisms for production on the basis of the holographic optical elements of the spectral selectors, multiplexers, other, requiring for its purpose the absence of side-peaks in the pattern and the contour of the spectral selectivity of the functions of the selective response
 The recording medium for recording the phase of the three-dimensional holograms and a method of manufacturing a three-dimensional phase holograms / 2035764
The invention relates to holography
The recording medium for recording the phase of the three-dimensional holograms and a method of manufacturing a three-dimensional phase holograms / 2035764
The invention relates to holography
 The method of determining the state of an object / 2035691
The invention relates to measurement techniques, in particular immersion-holographic methods of optical and physical measurements
Narrow-band selector on the basis of the reflective phase of the three-dimensional hologram / 2035766
The invention relates to holography
 Diffraction display, diffraction device, method for forming of display and method for forming different diffracted beams / 2256202
Device is used for displaying graphic images. One of variants of its realization includes holographic diffraction picture 100, positioned on constant magnet 120 or element connected to it, and coil or wire 160, through which current is let for moving the magnet. Rotation of holographic diffraction picture relatively to axis 10 forms an image using light, diffracting on holographic diffraction grid. Other variant of realization of display includes faceted rotary element, including facets matrix, each of which contains diffraction grid, and drive, meant for rotation of faceted rotary element from idle position to observation position. Rotation of faceted rotary element leads to forming of image by diffracted light.
 Directing optical signals by means of mobile optical diffraction component / 2256203
Source 70, 72, 74, 76 of optical signals 10 is directed toward mobile optical diffraction component 32. Each optical signal is characterized by its respective wavelength. Mobile optical diffraction component generates output optical signals 92, 94 and distributes them between output devices 88, 90.
 Photopolymer recording media for three-dimensional optical memory for very-large-scale information capacity / 2325680
Invention pertains to organic light sensitive recording media and can be used for making archival three-dimensional holographic optical memory with large scale information capacity. The photopolymer recording medium is described. It consists of solid triplexed polymer films or glass plates and light-sensitive layer between them, including unsaturated compounds, which are capable of ion-radical photopolymerisation; a system providing for photoactivation through radiation in the 400-600nm range and consisting of photochromic compounds and co-initiator. The light sensitive layer contains photochromic compounds with a long mean life of the photo-induced state or thermal irreversible photochromic bonds, and not necessarily, polymer binder, plasticizer and non-polymerisation organic liquid with a large refractive index. There is also proposed usage of such a recording medium in devices for three-dimensional holographic memory of large scale capacity.
 Hologram filter (versions) / 2376617
Hologram filter relates to devices for filtering optical radiation. The filter consists of a transparent substrate, coated with a transparent polymer film which contains a reflection hologram, and a protective layer adjacent to the polymer film. In the first version, the protective layer is in form of an optical wedge, the working surface of which, except the radiation inlet window in the thin part of the wedge, is coated with a reflecting layer. In the second version the filter additionally contains a mirror, placed opposite the reflecting hologram with possibility of varying the angle between the mirror and the hologram. Upon double passage of radiation through the reflecting hologram at different angles of incidence, a narrow spectral peak of the passing radiation is obtained at the output.
 Multipoint ophthalmological laser probe / 2435544
Group of inventions relates to medical equipment, namely, to laser probes and their combinations, applied in ophthalmology. Probe contains irradiating optic fibre for light beam irradiation, optic system, located on the irradiation side of irradiating optic fibre, and two or more receiving optic fibres, located opposite to irradiating optic fibre. Optic system contains diffractive surface. Light beam, irradiated by irradiating optic fibre, is diffracted into two or more diffracted light beams, focused in plane, parallel to diffraction surface. Receiving ends of each of two or more receiving optic fibres, are intended for reception of light beam, diffracted by optic system, are located in plane, parallel to diffraction surface. Another version of implementation is ophthalmologic laser probe, containing irradiating optic fibre and optic system, located on irradiation side of irradiating optic fibre. Optic system is made in the same way as in the previous version. Connection for laser probe contains case, optic system, located in case, first connecting link, located on one side of optic system; and second connecting link, located on the other side of optic system. Optic system contains diffraction surface, each of two or more diffracted light beams is focused in plane, parallel to said surface.
 Devices and methods for data storage / 2459284
Storage device comprises a plastic substrate, having multiple volumes arranged in the form of paths along multiple vertically packaged layers. The substrate demonstrates a non-linear optically sensitive functional characteristic, which is a threshold functional characteristic. The device comprises multiple micro-holograms, every of which is contained in the appropriate one of the volumes. Availability or absence of a microhologram in each of volumes characterises a stored data area.
 Plastic apochromatic lens / 2464600
Lens consists of five components, the first of which is in form of a biconvex lens, the second consists of a negative meniscus whose convex surface faces the object, on which a holographic optical element with optical power equal to 0.005-0.015 times the optical power of the lens is deposited, and a biconvex lens whose larger convex surface faces the object; the third and fourth components are aspherical positive menisci whose convex surfaces face the object; the fifth component is a plane-parallel plate.
 Optical system for holographic video camera / 2464608
Optical system for a holographic video camera includes an optical waveguide with an input holographic element on its surface, a lens, a visible radiation detector, an infrared radiation detector and a photoelectric converter connected to said detectors. The input holographic element is configured to split input radiation into visible and infrared parts. The optical waveguide is configured to transfer the visible part of radiation towards the visible radiation detector and the infrared part towards the infrared radiation detector. The lens is configured to form an image of an object through the optical waveguide and the holographic element on the detector. The photoelectric converter is configured to determine the phase difference between output signals, which are radiation intensity distribution in images obtained from visible and infrared radiation detectors.
 Method of making high radiation brightness laser diode / 2477915
Wide-emitter laser medium which is capable of generating multimode optical radiation is formed, having an active waveguide emitting layer, a first end and a second end. A partially transparent mirror is formed at the second end of the wide-emitter laser medium. The wide-emitter laser medium with a partially transparent mirror is placed on a high thermal conductivity substrate. A device is formed for adjusting the mode structure, which is based on a digital planar hologram, having an input end, said device being formed by forming a digital planar hologram at the first end of the wide-emitter laser medium in optical interaction with said hologram; the digital planar hologram is used as an opaque mirror by placing it on the same substrate as the laser medium, as a result of which an optical cavity is formed, and modes of optical radiation of the laser diode are selected, adjusted and amplified according to a give function.
 Method for protecting holograms from forgery and device for automatic control of hologram validity / 2246743
Method includes recording a hidden image on hologram in form of two-dimensional matrix of light optical points, wherein individual check code is set in predetermined angles of matrix; also, for positioning protective hologram an image of point object is recorded on it, outside limits of mask aperture, and during reading of hidden image protective hologram is displaced until restored image of point object placed outside mask aperture, fits point aperture in micro-diaphragm, and until an electric signal with maximal amplitude is detected at output of positioning control photo-detector, which shows correctness of positioning of protective hologram.
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(57) Abstract: The invention relates to the optical instrument and is intended for measurement of aberrations of optical systems. The inventive sensor, the wavefront containing a dispersing element in the form of diffraction gratings, they are anharmonic, the phase profile which is set depending on the form of a fixed aberration. 3 S. p. f-crystals, 5 Il. The invention relates to measuring technique and can be used for measuring aberrations of optical systems. When the light beam passing through the optical system (or the track distribution) there is a need to assess the effects of the optical system (or tracks) on the phase profile of the beam, for example, to compensate for this influence. Known wavefront sensor based on the measurement of the energy of the radiation passing through the airy disk [1] the Criterion for the quality of the beam in this case is the ratio of the magnitude of the intensity at a point aperture in the presence of aberrations to the intensity in their absence. This criterion is called factor of acted. However, the sensor has acted as a significant drawback it does not give the number of the second entity to the present invention is the Hartmann sensor [2] In this sensor, the entire aperture of the light beam through the element, representing a bitmap of N2holes in a thin opaque plate is divided into N2subaperture. Diffracted on the raster, the radiation is focused by a lens on a matrix of four (quadrant) photodetectors, so that each hole has its own photodetector. The local slope of the wavefront at each subaperture leads to change the position of the focal spot on the quadrant photodetector. The magnitude of the photocurrent from each element of the quadrant photodetector estimated value of the slope. In the Hartmann sensor used 4N2measuring channels, information from which is interpolated to the entire aperture. Then carried out the calculation of the coefficients in the decomposition of the phase profile with respect to orthogonal Zernike polynomials by the method of least squares. The coefficients of the decomposition is the main result, which gives an idea about the phase aberrations in the common form. The large number of measuring channels and complex mathematical processing leads to time-consuming for the calculation of the coecients in the expansion phase aberration, which reduces the efficiency of the measurements. Ceago front, including an element carrying out the decomposition of the light beam, a lens, a set of photodetectors with diaphragms and the servo system, the element carrying out the decomposition of the light beam, made in the form of anharmonic phase diffraction grating, providing a diffraction light beam in the N2orders and making a set of different (compensating) phase aberrations, the magnitude and sign of which is determined by the number of order of diffraction, while the number of measuring channels is reduced 4 times. In Fig. 1 shows an optical diagram of the wavefront sensor of Fig. 2 shows the numbering of the sensors; Fig. 3 illustrates the principle of operation of the device of Fig. 4 shows the dependence of the values of the center of gravity of the intensity measured at the +1 and -1 orders of diffraction, the amount of phase distortion (x= X2); Fig. 5 is an optical diagram of a wavefront sensor with a correction on the slopes. The wavefront sensor includes a specially made diffraction grating 1, the lens 2, set 3 photodetectors with diaphragms, servo system 4. The sensor operates as follows (Fig. 1). The light beam falls on the phase grating 1, after which A radiation. The signal from a single-element photodetectors (photodiodes) in the servo system 4 is amplified, digitized and processed by the microprocessor before submission to the desired shape of the expansion coefficients of the phase aberrations by Zernike polynomials. In measuring systems that can be numbers, and, therefore, the servo system includes a display device information copropagate or digital indicator. In automatic control systems (adaptive systems) that control the wavefront corrector voltage, which are formed in the servo system using amplitude amplifiers. The phase diffraction grating is manufactured in accordance with the expected set of aberrations. So, to measure astigmatism (x2-y2and defocusing you can use the phase grating profile sin (ax2+ bx) + sin (ay2+ by), where a and b lattice constant. For example, the wave front is astigmatic type X2where an unknown factor. The result of the wavefront sensor such aberration manifests itself in the redistribution of intensities in orders of diffraction (Fig. 3b) in relation to the case of the absence of aberrations, i.e., when 0 (Fig. 3A). This is because cow, where this aberration leads to polvocasero adding with a complex conjugate of the aberration caused by the phase grating (in this case, the plane of focus of the position P is shifted to the P position'). The value of the coefficient is calculated from the position of the center of gravity of the maxima of the intensities Im,nin the diffraction ordersxywhere n and m the number of the column and row of the matrix of photodetectors; N2the number of photodetectors. The dependence of the phase distortion from the position of the center of gravity of the intensity maximum is monotonous character. An example of such dependence for the two photodetectors shown in Fig. 4. For the measurement of spherical aberration and defocusing you can use the phase grating profile sin [a(x2+ y2)2+ bx]+ + sin [a (x2+ y2) + by] for measuring astigmatism any orientation: sin [a (x2y2)+ + bx] + sin (axy + b). The accuracy of the measurement of the aberrations of the wave front corresponds to the precision specified by the factor of acted (for example, for the standard deviation of the wave front in 0.1 from the plane factor of acted reduced to 60%). The measurement range of the phase aberrations is limited by the lattice parameters and the h wave front position of the diffraction orders is changed, i.e., the operation of the sensor is critical to the change in the slope. This can be eliminated by introducing into the servo system control channel tilt mirror 5 that connects the mirror to peoplewatch with the quadrant photodetector installed in the zero diffraction order (Fig. 5). The change in the slope of the wave front leads to the displacement of the focal spot on segments of a sensor and a corresponding change of the photocurrent from each segment. Subtracting the signals from opposite segments of the photodetector, get information about the tilt of the wave front. For ease of presentation, these signals can be calibrated. After measuring the slope if the slope required) differential signals are amplified and fed to piezodrive mirrors. Piezodrive are made of bimorph piezoceramic plates (piezoplates, glued opposite polarization, which is due to the inverse piezoelectric effect when connecting to spray on them to contacts of an electrical voltage curve, because one plate is lengthened and the other shortened the resulting bending moment). These piezodrive one end attached to the frame and the other to the edge of the mirror. Depending on the magnitude and sign of applications to the grid. The choice of the gain in the control channel tilt mirror servo-system is made so that the management was sustainable and mirror perform the correction of the tilt of the wave front. The wavefront sensor is to be used for measurement of the astigmatism of the semiconductor laser for the manufacture of expansion joints. Another important use of adaptive optical system for optical communication through the atmosphere and intracavity correction in technological lasers. 1. The wavefront SENSOR, including associated optical dispersive element in the form of a diffraction grating, a lens, a set of photodetectors with diaphragms connected to the servo system, characterized in that, for the purpose of measuring astigmatism and defocus, diffraction grating made anharmonic phase profile sin(ax2+ bx) + sin(ay2+ by), where a and b lattice constant. 2. The wavefront sensor, including associated optical dispersive element in the form of a diffraction grating, a lens, a set of photodetectors with diaphragms connected to the servo system, characterized in that, for the purpose of measuring spherical aberration and defocus, difraction the/SUP>) + by] where a and b lattice constant. 3. The wavefront sensor, including associated optical dispersive element in the form of a diffraction grating, a lens, a set of photodetectors with diaphragms connected to the servo system, characterized in that, for the purpose of measuring astigmatism any orientation, diffraction grating made anharmonic phase profile sin[a(x2y2) + bx] + sin(axy + bx), where a and b lattice constant.
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