A 37-W cw CO2 laser operating on the R(30) 9-μm transition is used to pump a linear waveguide cavity containing NH3. Raman emission at 12.08 μm is observed with a cw output power of 10.2 W. This performance represents a photon conversion efficiency of >40%, the highest yet reported for a cw optically pumped infrared laser.
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Rolland et al. (1984) studied this question.
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