Holographic grating recording

The combination of these features presents photochromic IsoSm films as interesting and diverse media for optical data storage. In Section 5.4, we consider holographic grating recording in copolymer films and related (combined) photorecording techniques. 

BS - beam splitter, M - mirror, WP - wave plate, P - polarizer 

16 (A) Experimental setup for holographic grating recording (B) schematic representation of electric field patterns on a vertically installed sample. 

17 Microphocogra s of an (A) s,s-grating and a (B) sj -gracing from SK6 (22-pm pressed film) in crossed polarizers. 

The quality of holographic grating is estimated by the efficiency of the probe beam scattering from the grating, calculated as the ratio of light intensities for the first diffraction order and for the incident beam, The 

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Blinov, L. M., Kozlovsky, M. V., and Gipparone, G. Photochromism and holographic grating recording on a chiral side-chain polymer containing azobenzene chromophores, Chem. P/jys., 245,473 1999). 

Materials Design and Switching Mechanism. The dynamic holographic grating recorded with azobenzene SCLCPs is erased once the writing beams are turned off. It is of interest to develop materials with which one can record a stable diffraction grating that, after formation, can be repeatedly... 

The diffraction efficiency behavior of the holographic gratings recorded in photopolymers is due to several conditions such as monomer concentration, humidity, temperature, recorder beam intensity, pwlymerization velocity, mechanical vibrations, etc. 

Fig. 11. Holographic gratings recorded in AZ-containing LC block copolymers with well-defined structures and enhancement of gratings upon microphase separation.

Kwak C.H., Kim J.T. and Lee S.S., Scalar and vector holographic gratings recorded in a photoanisotropic amorphous AS2S3 thin-film. Opt Lett., 13,437-439 (1988). 

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