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Proceedings Paper

Control of output pattern of a photorefractive oscillator using a spatially filtered feedback
Author(s): Hong Lin; Endri Trajani; Kristian M. Bodek; George A. Ruff
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Paper 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.

Paper Details

Date Published: 17 February 2003
PDF: 7 pages
Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); doi: 10.1117/12.474400
Show Author Affiliations
Hong Lin, Bates College (United States)
Endri Trajani, Bates College (United States)
Kristian M. Bodek, Bates College (United States)
George A. Ruff, Bates College (United States)

Published in SPIE Proceedings Vol. 4833:
Applications of Photonic Technology 5

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