Abstract

We report a doubly resonant continuous-wave CO₂ laser frequency-quadrupling device that generates 200 nW of $2.55-\mathit{\mu }\mathrm{m}$ $\left(4\omega \right)$ and as much as 2 mW of $5.1-\mathit{\mu }\mathrm{m}$ $\left(2\omega \right)$ radiation out of 1.7-W fundamental radiation at $10.2 \mathit{\mu }\mathrm{m}$ $\left(\omega \right)$. The quadrupling process results from two resonant cascading second-harmonic generations by use of a walk-off-compensated twin AgGaSe₂ device $\left(\omega \to 2\omega \right)$ and a ZnGeP₂ nonlinear crystal $\left(2\omega \to 4\omega \right)$.

© 1997 Optical Society of America

Efficient continuous-wave frequency doubling of a tunable CO₂ laser in AgGaSe₂

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