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High Brightness Tunable Tandem Optical Parametric Oscillator at 8-12μm

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Abstract

Nd:YAG radiation at 1.064μm is converted to the 8-12μm region, using two consecutive OPOs. The first conversion stage: 1064nm→1574nm is based on a non-critically phase matched KTP crystal. The second stage: 1574nm→8-12μm is an angle tuned AgGaSe2 OPO. In order to enable high- energy output we use large diameter pumping beams. Despite the large diameter beams, a low divergence is achieved on both OPOs by using unstable confocal resonators that reduce the divergence of the oscillating beams each round trip.

© 2004 Optical Society of America

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