Effect of optical feedback on beam patterns of a photorefractive oscillator

摘要

We have experimentally studied the effect of an optical feedback on spatiotemporal dynamics of a unidirectional photorefractive oscillator. The output of the photorefractive oscillator is sent to a feedback arm in which two lenses form a 4-system. The relative phase difference between the feedback signal and the oscillating beam is changed with a piezoelectric translator attached to one of the mirrors in the feedback arm. Spatial filtering is implemented in the Fourier plane in the feedback arm. The phase sensitive feedback can be used to select beam pattern belonging to the same oscillating family or to drive the photorefractive oscillator from one family to another. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 29]