Noncritical second harmonic generation of CO2 laser radiation in mixed chalcopyrite crystal

We have generated a tunable second harmonic of CO2 laser radiation noncritically for the first time in a potential mixed chalcopyrite crystal AgGaxIn1−xSe2. Wide angular acceptance and increased conversion as compared to AgGaSe2 have been observed and the tuning characteristics have been explained using the dispersion data of its two end crystals.