Research Papers in Physics and Astronomy

 

Date of this Version

7-1998

Comments

Published in Journal of the Optical Society of America B 15:7 (July 1998), pp. 2154-2160. Copyright © 1998 Optical Society of America. Used by permission.

Abstract

The complex coupling constant of a photorefractive polymer was measured as a function of an applied electric field by use of a modified ac phase modulation technique. We determined that both a photorefractive index grating and a nonphotorefractive absorption grating were present. The electric field dependencies of the amplitude and the phase of the photorefractive gain coefficient were accurately described by standard photorefractive theory. The accuracy of the photorefractive phase shift as measured by this phase-modulation technique was ±1° near phase shifts of 90° and ±3° near phase shifts of 45°.

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