Diffraction and coupling kinetics of photorefractive hologram

Jianzhong Zhang; Francis T. S. Yu; Deanna K. McMillen

doi:10.1117/12.217026

18 August 1995 Diffraction and coupling kinetics of photorefractive hologram

Jianzhong Zhang, Francis T. S. Yu, Deanna K. McMillen

Proceedings Volume 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications; (1995) https://doi.org/10.1117/12.217026
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The coupling kinetics of a reflection-type photorefractive (PR) hologram are studied in this paper, in which we have found that the coupling between the adjacent channels increases as the reading time prolongs. As long as the wavelength difference between the writing and reading beams is sufficiently large, there is only a small amount of increase in coupling. However, as wavelength difference between them is adequately small (but larger than the minimum wavelength separation calculated by Kogelnik's formula), the coupling between two channels increases to a significant value and then decreases. Our study shows that the reading beam is modulated by the grating in another channel for which it produces a weak back scattered light. As the backward scattered light interacts with reading beam, a new grating is formed. It in turn amplifies the back scattered light. Therefore, the coupling increases very rapidly as compared with the normal fanning process. In this paper, we have used the Kukhtarev's charge transport model to evaluate the time-evolution of coupling. We have found that the calculated results are consistent with the experimental observation.

Citation Download Citation

Jianzhong Zhang, Francis T. S. Yu, and Deanna K. McMillen "Diffraction and coupling kinetics of photorefractive hologram", Proc. SPIE 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications, (18 August 1995); https://doi.org/10.1117/12.217026

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