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Proceedings Paper

Diffraction and coupling kinetics of photorefractive hologram
Author(s): Jianzhong Zhang; Francis T. S. Yu; Deanna K. McMillen
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Paper 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.

Paper Details

Date Published: 18 August 1995
PDF: 9 pages
Proc. SPIE 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications, (18 August 1995); doi: 10.1117/12.217026
Show Author Affiliations
Jianzhong Zhang, The Pennsylvania State Univ. (United States)
Francis T. S. Yu, The Pennsylvania State Univ. (United States)
Deanna K. McMillen, U.S. Army Missile Command (United States)

Published in SPIE Proceedings Vol. 2529:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications
Francis T. S. Yu, Editor(s)

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