Accession Number : ADP006774

Title :   Low-Frequency Noise and Photoinduced Scattering in Photorefractive Crystals,

Corporate Author : INSTITUTE OF AUTOMATION AND ELECTRICAL MEASUREMENTS NOVOSIBIRSK (USSR)

Personal Author(s) : Sturman, B. I.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Photoinduced scattering (PS) is inherent in a varying degree in any photorefractive crystal. The origin of the PS is quite clear: this is an amplification of the weak seed scattering. A number of papers, deal with a description of the effect. The pump and scattered waves supposed usually to have the same frequency. In the framework of that approach, a steady-state PS may only be caused by the nonlocal photorefractive response (i.e. by shifted gratings). However, in many cases experiments show the steady-state PS to be abnormally large and this can not be accounted for by the nonlocal response. LiNbO 3 :Fe crystals, where the local response (i.e. unshifted gratings) exceed in value the nonlocal one by 10 1-10 2 times, can be pointed out as an example. We suggest a new interpretation of the PS for crystals with a predominant local response.

Descriptors :   *LIGHT SCATTERING, AMPLIFICATION, CRYSTALS, FREQUENCY, RESPONSE, SCATTERING, STEADY STATE, REFRACTION, LOW FREQUENCY, PHOTOCONDUCTIVITY, FREQUENCY SHIFT, SYMPOSIA.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE