SU1615657A1 - Apparatus for copying holographic diffraction gratings - Google Patents

Abstract

The invention relates to the precision measurement of linear displacements, as well as information storage systems, and can be used in machine-tool construction, measuring microscopy, metrology, spectroscopy, holographic memory devices, holographic cinema and television. The device contains a source of coherent radiation, a collimating system, an original and a substrate with a photosensitive layer, facing each other by recording layers, rigidly connected to each other. In order to make copies with a length greater than the exit aperture of the collimating system, a mirror is additionally introduced into it, which is movable along the length of the original and installed between the collimating system and the original. The mirror is set at an angle of 45 ° + 22O / 4, where 22O is the angle between the axes of the arms of the interferometer used to record the original.

Description

The invention relates to precision measurement of linear displacements, as well as information storage systems, and can be used in machine-tool construction, measuring microscopy, metrology, spectroscopy, holographic memory devices, holographic cinema and television.

A device for obtaining copies of holograms is known, consisting of a hologram of a matrix on which liquid synthetic polyester resin is applied, and a glass substrate. Its operation is based on the use of the relief of the photo-emulsion layer -l.

The disadvantages of this device are the presence of phase distortions due to the heterogeneity of the layer

resins formed during polymerization, as well as the need to treat harmful substrates and the original with harmful substances and substances.

The closest to the present invention is a device for the interfacial copying of microhalsgrams, which contains a source of coherent radiation, a collimating system, a fixed original and a substrate: with recording: layers, facing each other emulsions and rigidly connected with each other G2 ,

A disadvantage of the known device is that it provides copying, within the aperture, of the output lens of a collimating system, to which, in the case of a presi

Si

Od sp

feasting has increased aberration requirements (less than / 10) which is very difficult

; The aim of the invention is to obtain a copy of the holographic diffraction and on-grating larger than the aperture of the upper dinza of the collimating system

The goal is achieved by a known device for copying holographic diffraction gratings containing a source of

relative radiation collimating

1, the original and the substrate with a photosensitive layer facing the dзуg to the friend, recording layers, rigidly interconnected between them, a mirror was additionally introduced,

e-mail with the ability to move along the length of the original and installed between the collimating system

OriginalMass

In this case, the angle of inclination of the .4 axis mirror is (5), where b | - the angle between the axes of the interferometer arms used to record the original

I Fig. 1 shows the principle of the iibHaH optical design of the device; HJA FIG. 2 a - a diagram of the relative p | position of the mirror and the substrate

I The principal optical scheme of the device consists of a coherent radiation source 1, a collimator 2, 3, a mirror 4 that can be moved along a stationary original 5, the mirror being set at an angle to the original, the substrate 6 with a photosensitive layer on which the copy will be recorded. The original | al and the substrate face each other. Registration layers are fixed on a fixed surface and placed horizontally. The device works as follows: piasoMo

The beam from the radiation source 1 after passing through the collimator 2, 3 falls on the mirror 4. Reflecting from the Mirror, the beam falls under the 0/2 K fragrance normal and the surface of the original Pass through the original, the light beam is modulated in accordance with the amplitude and phase phase the distribution of the original, diffraction on it, and interferes with the undifferentiated beam in the plane of the photosensitive copy layer. At the same time, standing waves are created that are identical to standing waves, in which the grid-origi

0

five

cash ,. Stumps are recorded with a copy. Mirror 4 moves along the original at speed V, detecting the entire length of the original and the copy. This is equivalent to illuminating the original with a reduced beam of light with an aperture equal to the length of the moving mirror. Velocity V is determined experimentally, based on the requirements of illumination of the photosensitive layer, respectively, with its characteristic photosensitivity curve to obtain maximum diffraction efficiency (° C ° C AZ - - 0/4 is also optimal for y d, (, (; It was experimentally found that the highest diffraction efficiency is obtained when the copy is recorded at the same angle to its normal, at which the original was recorded. The angle of the mirror to the original depending on the angle 9 between the axes Cove in the interferometer with the original recording is determined depending on the given m using the notation of FIG. 2.

 18SR

R

 180 ° -SO - (1) (2)

From equation (1) (6

180 ° 5

0

five

0

five

Substituting the value of f from (2), get

; - "..

Since the mirror has the ability to move along the substrate axis, copying in the proposed device is carried out in continuous mode,

Using this device, a copy of long holographic diffraction gratings was obtained at the Leningrad Institute of Nuclear Physics. The original length was 700 mm, the frequency was 1000 LIN / MM, and the accuracy was 0.4 µm for the entire length of the Aperture of the illuminating collimator 150 mm. Linear section is 70 mm. Copy length is larger than the aperture of the output lens of the illuminating collimator with

Thus, the proposed device for copying holographic diffraction gratings, in comparison with the best samples of a similar purpose, makes it possible to perform interference copying of holographic diffraction gratings 1615657

current length bopie than aperture time collimating lenses

output lens of a collimating system- (lenses) small aperture available

we, which allows for manufacturing and manufacturing, and are widely produced

To copy a large length, in infusion industry Yuo

Figg

Claims (1)

1. A DEVICE FOR COPYING HOLOGRAPHIC DIFFRACTION GRATINES containing a source of coherent radiation, a collimating system, an original and a substrate with photo