Abstract
Improvements in the generation of 8 - 12 mm radiation have been accomplished using the tandem OPO approach. Greater than 3 mJ/pulse at 5 Hz (η = 9%) was obtained from a AgGaSe2 OPO module consisting of a 10 × 10 × 25 mm3 crystal with direct contact AR coated ZnSe windows pumped at 1.54 µm. The idler beam quality was improved from 250 mm-mrad to 150 mm-mrad by a factor of four reduction in cavity Fresnel number.
© 1999 Optical Society of America
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