We present an analysis of what is called parametric oscillation in photorefractive media. It is
shown theoretically that when a running grating and a constant electric field are applied to a …

The instability leading to the appearance of subharmonics in the presence of a square wave
applied field is investigated both theoretically and experimentally. The threshold conditions …

A new mechanism for enhancing the photorefractive grating amplitude in Bi_12SiO_20 is
presented. We show experimentally that, by recording two photorefractive running gratings …

The theory for two-wave mixing in a photorefractive material with an external electric field
and a moving grating is developed. Large gain enhancements are predicted for grating …

A new subharmonic regime in photorefractive bismuth silicon oxide has been discovered by
the use of the running-grating technique. In this regime the subharmonic grating splits into …

We analyze the nonlinear excitation of holographic gratings in a photorefractive crystal
being subject to an alternating electric field and a stationary light interference pattern. The …

The influence of beam coupling on photorefractive parametric oscillation generated in a
Bi_12SiO_20 crystal is investigated experimentally by comparing two configurations with …

We show analytically and numerically that the refractive-index gratings produced by the
photorefractive effect need not be of the same periodicity as the driving light intensity. Even …

We show that the dielectric grating induced by an external probe in a photorefractive crystal
with the period of the external probe can be unstable against period multiplication. We …

Abstract In 1988, Mallick et al.[1] found self-generated subharmonics in Bi 12 SiO 20 (BSO).
They used two coherent almost linear pump beams (wave vectors k→ p and k→ p′, see …