Control of output pattern of a photorefractive oscillator using a spatially filtered feedback

Hong Lin; Endri Trajani; Kristian M. Bodek; George A. Ruff

doi:10.1117/12.474400

17 February 2003 Control of output pattern of a photorefractive oscillator using a spatially filtered feedback

Hong Lin, Endri Trajani, Kristian M. Bodek, George A. Ruff

Proceedings Volume 4833, Applications of Photonic Technology 5; (2003) https://doi.org/10.1117/12.474400
Event: Applications of Photonic Technology 5, 2002, Quebec City, Canada

Abstract

We have experimentally studied pattenr control in a unidirectional photorefractive oscillator in which a barium titanate crystal is used to provide two-wave mixing gain. The crystal is pumped with a single frequency argon laser and the cavity length is actively stabilized. The output of the photorefractive oscillator is sent to a feedback arm that consists of two mirors and two lenses. The lenses are arranged to form a 4f-system. Spatial filtering is implemented by placing a mask in the Fourier plane in the feedback arm. The relative phase difference between the feedback signal and the oscillating beam is changed with a piezoelectric translator attached to one mirror in the feedback arm. Using this contorl theme we can change the output pattern, e.g., from a Gauss-Laguerre mode to an Gauss-Hermite mode or to suppress and enhance side lobes in a pattern.

Citation Download Citation

Hong Lin, Endri Trajani, Kristian M. Bodek, and George A. Ruff "Control of output pattern of a photorefractive oscillator using a spatially filtered feedback", Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); https://doi.org/10.1117/12.474400

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