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

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Abstract

Second-harmonic output at 4.6–5.5 µm of the order of 6 m W with a 0.12% external conversion efficiency has been obtained by pumping a AgGaSe2 crystal with a low-power cw CO2 laser. The surface damage threshold of AgGaSe2 for cw radiation was found to be inside the limit of 33–45 kW/cm2 in the 9.2–10.8-µm wavelength region. Another important limitation of the pump power connected with a thermal lensing effect in crystal was determined experimentally. A comparison was made of AgGaSe2 and ZnGeP2 crystals as materials suitable for the efficient generation of the second harmonic of cw CO2 laser radiation.

© 1997 Optical Society of America

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