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Proceedings Paper

Cleanup of Nd:YAG laser beams by two-wave mixing in InP:Fe
Author(s): Hans Joachim Eichler; Y. Ding; S. Kerekgyarto; Bernhard Smandek
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Paper Abstract

A two wave mixing experiment using a Nd:YAG laser, operating at 1064 nm, and a photorefractive InP:Fe crystal resulted in a gain coefficient (Gamma) of 17 cm-1 and a signal gain (gamma) of 15. In the case of a (pi) /2 spatial phase shift between the light interference fringes and the refractive index grating, phase cross talk is eliminated. Amplitude cross talk can be eliminated using volume hologram averaging of the beams. With this scheme a weak Gaussian beam is amplified by a pump beam containing strong phase and amplitude aberrations. Energy efficiencies of 27% were obtained under preservation of the nearly diffraction limited beam shape.

Paper Details

Date Published: 22 April 1993
PDF: 12 pages
Proc. SPIE 1834, Laser Energy Distribution Profiles: Measurement and Applications, (22 April 1993); doi: 10.1117/12.143862
Show Author Affiliations
Hans Joachim Eichler, Technical Univ. of Berlin (Germany)
Y. Ding, Technical Univ. of Berlin (Germany)
S. Kerekgyarto, Technical Univ. of Berlin (Germany)
Bernhard Smandek, Technical Univ. of Berlin (Germany)

Published in SPIE Proceedings Vol. 1834:
Laser Energy Distribution Profiles: Measurement and Applications
James M. Darchuk, Editor(s)

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