SU734603A1 - Method of restoring transmitting holograms - Google Patents

Description

one

The invention relates to the field of Holographic And can be used in color and pulse holography, in the production of holographic portraits and the registration of living biological objects with a limited dose of radiation, in pictorial techniques, as well as in the recording of large and long objects.

There is a known method of restoring transmission holograms using a light source having a wide spectral range of 1.

This method (rainbow holograms) involves recording holograms in two stages. In the first stage, a conventional transmissive hologram is produced in converging beams. Then a copy is made from it, placing a horizontal gap of 8–10 mm in width on the path of the restoring beam. The copy pattern is in converging beams.

The disadvantage of this method is the absence of vertical parallax. The image itself strongly disperses, t, e. has a variable color, which is unacceptable in color holography.

The closest in technical essence is the method of recovering.

transmissive holograms 2 by illumination of the hologram with a beam, for which the reflected non-diffracted wave transmitted through the hologram is used. A mirror is placed on the path of the non-diffracted beam, which re-reflects the light in the opposite direction. The curvature of the reflected wave front is opposite

10 of the original. As a result, its real image is formed in the area of the object. Laser radiation is used to restore. The main application of the method in micro15 electronics is for the manufacture of integrated circuits,

The method is difficult to implement, since a laser monochromatic source is required to restore the image. (restraining in white light is impossible), and large aperture mirrors are used in the restoration, which complicates the whole process and makes it

25 bulky.

The purpose of the proposed method is to simplify the recovery process,

The goal is achieved by the fact that, in the method of restoring transmission holograms, a reflective hologram of the source is recorded, the location and characteristics of which are identical to the reference source when the transmission hologram is recorded, set it behind the transmission hologram and restore the resulting hologram system in white light from the transmission hologram.

FIG. 1 shows a recording scheme of a transmissive hologram; in fig. 2 shows a recording scheme of a reflective hologram of a restoring source; in fig. 3 is a diagram of restoring a transmission hologram to a reflection in white light.

The method is as follows. The transmissive hologram is initially recorded on a relatively highly sensitive photographic material. FIG. 1, the following designations are introduced: 1 — the location of the reference source, 2 — the recorded transmitting hologram of the object, 3 — the object, 4 — the observer.

Then, the reflective hologram 5 of source 1 is recorded (Fig. 2) The location of source 1 relative to hologram 5., its geometrical characteristics and spectral composition are identical to reference source 1 when recording transmissive hologram 2 (Fig. 1). Position 6 indicates the location of the reference source for the reflective hologram.

In the final stage (Fig. 3), the reflective hologram of the source is established behind the transmitting hologram, after which the resulting hologram is restored in white light. When illumination of holograms 2.5 with white light source b, which corresponds to source 6 (figure 2), an undifferentiated light wave

It reconstructs on the hologram 5 a wave identical to 1, which, in turn, is restorative for the transmissive hologram 2. As a result, observer 4 will see a monochromatic imaginary image 3 of object 3. The monochromaticity of the image spectrum is provided by the hologram 5.

The method makes it possible to significantly simplify the process of restoring transmission holograms by eliminating the need to use expensive laser and optical equipment, as well as expanding the class of objects whose holograms can be restored with white light.

Claims (2)

Invention Formula The method of restoring the transmission holograms by illuminating the hologram with a Beam, which uses a non-diffracted reflected wave transmitted through a hologram, characterized in that, in order to simplify the recovery process, the reflective hologram of the light source whose location and characteristics are identical to the reference source when recording the transmission hologram is recorded , install it behind the transmission hologram and restore the resulting system of holograms in white light from the side of the transmission holograms. Sources of information taken into account in the examination 1o Benton S.A. New method of hoEogram recording. JournaP of the OpticaP Society of America, v. 59, 1969, p. 1545. 2. US patent 3604777, cl. 350-3.5 publ. 1971 (prototype)