SU1401432A1 - Apparatus for processing the holograms of phased objects - Google Patents

Abstract

The invention relates to optical instrument making. The goal is to expand the functionality of the device. Additionally, a reference hologram is introduced, optically coupled to the plane of the object hologram. An optical system is installed behind the reference hologram, comprising a lens, a filter and an additional recorder. 1 il.

Description

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The invention relates to optical instrument engineering, can be used in experimental gas and hydrodynamics, thermal physics, thermal engineering, acoustics, interference spectroscopy and in other fields of science and technology associated with the study of phase objects characterized by low densities, and also when controlling the quality of precise optical elements, it is an improvement of the device according to auth. № 1330603

The purpose of the invention is the extension -t. the functionality of the device by obtaining an arbitrary tuning of the interference fringes.

The drawing shows a diagram of the device.

The device contains a laser 1, a telescopic system consisting of two lenses 2 and 3, an illuminating mirror system 4-7 for separating and converging light beams, a photo shutter 8, an object hologram 9, two mirror lenses 10 and 11, in this case acting as pivoting mirrors and lenses, aperture 12 with two holes, a recorder 13, a second photogate 14, a folding mirror 15, a reference hologram holder 16, an optical system of spatial beam separation 17-20, mounted behind the reference hologram 16, made up of lenses 17 and 18, with a spatial filter 19 placed in the focal plane of the lens 17, and an additional registrator 20.

The device works as follows.

The radiation from laser 1 is expanded by a telescopic system made up of lenses 2 and 3, and is directed to an optical system 4-7 for dividing and converging light beams. Two light beams are directed through the open shutter 8 onto the object hologram 9. The object hologram 9 is obtained after n 1,2,3, ... rewriting buttons with interference + first orders of light diffraction on the original hologram. A wave front is recorded on the hologram with a 2-fold increase in the phase of the original wave front. However, the aberrations of the original wavefront, which must be compensated for by

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the power of the reference hologram 16 mounted in the holder.

The hologram is illuminated by two beams, formed by two beamer. Real cubes 4 and 6, and mirrors 5 and 7. The second beamsplitter 6 and mirrors 5 and 7 of the lighting system

we are equipped with angular turn mechanisms with respect to the axes, lying in horizontal and vertical planes. The angle between the two beams illuminating the hologram 9, the angular turns of the mirrors 5 and 7 and the cube 6 is set so that plus N-th diffraction order illuminating the hologram 9 of the light beam focused by the lens 10 passes through one aperture of the diaphragm 12 and minus Nth order of diffraction of another beam, illuminating the hologram 9j- through another aperture-i we 12.

The diaphragm 12 is made with the possibility of mutual displacement of the two holes. The light beams that pass through the holes in the diaphragm are reflected and collimated by the mirror lens 11, reflected by the hinged mirror 15 and directed onto the reference hologram 16. In this way, the beams experience diffraction on the reference hologram, on which only aberrations of the original wave front are recorded (without phase changes LC introduced by the test object). From the reference hologram. two wave fronts, free from the aberrations of the optical elements, are reconstructed.

One wavefront has a phase plus N2 ucf, another wave front minus N2 uCf, and phase distortions due to aberrations of optical elements are compensated for. These wavefronts are focused by the lens 17, filtered against the background of interference by the diaphragm 19 and sent to the lens 18, which optically interfaces the plane of the hologram 16 with the plane of the additional recorder 20.

In the plane of the additional recorder 20, an interference pattern of the phase object under study is formed with an increase in sensitivity of 2- N C |) pa3 and compensation for the aberrations of the optics used to register the original hologram. For arbitrary tuning of the interference. 1x bands, the twist beam splitter 12 is used.

Claims (1)

The claims of the invention Device for processing holograms of phase objects according to ed. No. 1330603, characterized in that, in order to expand the functional capabilities of the device due to arbitrary adjustment of the interference holder, which is optically conjugated to the plane of the object hologram by means of optical elements of the receiving system and a folding mirror, and an optical system installed behind the reference hologram, containing mounted lens, spatial frequency filter located in the focal plane of this lens, a second lens and an additional recorder, the second vetodelitel mirror and lighting system equipped with mechanisms angular turns about axes lying in the horizontal and vertical planes, and vypolnepolos diaphragm incorporated therein grams mounted on the support kolodvuh holes are mutually offset in the regulated