Holographic image recording

An interesting application of the high spatial resolution power associated with photopolymerization of diacetylenes is holographic image recording recently studied by Richter, Guttler, and Schwoerer These authors irradiated a high quality... 

The refractive indices of the azobenzene-modified polysilsesquioxane films in trans and cis conformations were measured. The differences between the refractive indices (A d = d,trans d,cis) are 0.007 and 0.009 for 4-tert-butylphenylazophe-nol and 4-phenylazophenol modified polysilsesquioxanes, respectively. We can expect that the photocontrolled refractive indices of the azobenzene-modified polysilsesquioxanes will have novel applications in optoelectronics, switching devices, optical waveguides, and holographic image records. 

Blinov, L. M., Gipparone, G., Kozlovsky, M. V., Lazarev, V. V., Scaramuzza, N. Holographic development of a hidden UV image recorded on a liquid crystalline polymer. Optics Commun. 73, 137 (2000). 

In the reflection type holographic image storage (where the Ic is used as reference beam, shown in section 4.1), the angles between the two recording waves is 173°, so it is proved that this sample can store the gratings with spatial frequency of 63001ines/ mm. 

Fig. 33. Optical setup and the patterns displayed on the SLM in rewritable coUinear holographic image storage (a) Optical setup (b) Recording process pattern (c) Reading process pattern...

Garan, S. S. (2013) Holographic imaging Information recording and retrieval. Journal of the Indian Institute of Science, 93,35-45. 

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