Abstract

The spatial subharmonic instability arising from the material equations is investigated theoretically for both square and sinusoidal applied alternating electric fields. The threshold conditions are given for the amplitude of the applied field as a function of the detuning frequency, contrast of fundamental interference pattern, and interbeam angle by the use of the temporal solutions for the amplitude of the space-charge field presented elsewhere [ J. Opt. Soc. Am. B. 10, 124 ( 1993)] The different effects of the square wave and sinusoidal applied fields for subharmonic generation are discussed.

© 1994 Optical Society of America

Fundamental space-charge fields for applied alternating electric fields in photorefractive materials

A. Grunnet-Jepsen, C. H. Kwak, I. Richter, and L. Solymar
J. Opt. Soc. Am. B 11(1) 124-131 (1994)

Parametric generation of a spatial subharmonic grating in photorefractive crystals: theory

O. P. Nestiorkin and Ye. P. Shershakov
J. Opt. Soc. Am. B 10(10) 1907-1918 (1993)

Frequency-dependent photorefractive response in the presence of applied ac electric fields

Frederick Vachss
J. Opt. Soc. Am. B 11(6) 1045-1058 (1994)

Investigation of photorefractive subharmonics in the absence of wave mixing

B. I. Sturman, T. E. McClelland, D. J. Webb, E. Shamonina, and K. H. Ringhofer
J. Opt. Soc. Am. B 12(9) 1621-1627 (1995)

Spatial subharmonics in photorefractive crystals

B. I. Sturman, A. Bledowski, J. Otten, and K. H. Ringhofer
J. Opt. Soc. Am. B 9(5) 672-681 (1992)