Abstract
We report a doubly resonant continuous-wave CO2 laser frequency-quadrupling device that generates 200 nW of and as much as 2 mW of radiation out of 1.7-W fundamental radiation at . The quadrupling process results from two resonant cascading second-harmonic generations by use of a walk-off-compensated twin AgGaSe2 device and a ZnGeP2 nonlinear crystal .
© 1997 Optical Society of America
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