We report a doubly resonant continuous-wave CO2 laser frequency-quadrupling device that generates 200nW of 2.55-μm (4⍵) and as much as 2mW of 5.1-μm (2⍵) radiation out of 1.7-W fundamental radiation at 10.2 μm (⍵). The quadrupling process results from two resonant cascading second-harmonic generations by use of a walk-off-compensated twin AgGaSe2 device (⍵→2⍵) and a ZnGeP2nonlinear crystal (2⍵→4⍵).
© 1997 Optical Society of America
K. Stoll, J.-J. Zondy, and O. Acef, "Fourth-harmonic generation of a continuous-wave CO2 laser by use of an AgGaSe2/ZnGeP2 doubly resonant device," Opt. Lett. 22, 1302-1304 (1997)