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Proceedings Paper

Study of laser-induced damage in PPLN
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Paper Abstract

Periodically-poled lithium niobate (PPLN) is a well- established nonlinear material for down converting the output from a solid state laser, the pump wavelength, to generate an emission close to 4 micrometers . A simple OPO configuration was used with a resonated signal beam passing through a heated PPLN crystal, to avoid photo-refraction. A Q-switched Nd:YAG pump laser was used for generating short- duration, high-intensity one micron pulses. Direct modulation of the diode sources enable the emission to be controlled. The pump beam had good beam quality, with an M2 of about 1.8 in each axis, and modulated average power in excess of 6 W. Damage to PPLN crystals used in the solid state laser has been observed. Irreversible damage of the nonlinear medium has been recorded: initially to the output face of PPLN crystals, but latterly to the bulk structure. These observations were made over a range of pumping conditions and OPO configurations. Estimates of the damage threshold have been surprisingly low, of the order of 1.5 J/cm2.

Paper Details

Date Published: 9 April 2002
PDF: 9 pages
Proc. SPIE 4679, Laser-Induced Damage in Optical Materials: 2001, (9 April 2002); doi: 10.1117/12.461695
Show Author Affiliations
David H. Titterton, Defence Science and Technology Lab. (United Kingdom)
Jonny A.C. Terry, QinetiQ (United Kingdom)

Published in SPIE Proceedings Vol. 4679:
Laser-Induced Damage in Optical Materials: 2001
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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