Efficient generation of mid-infrared radiation by noncritically phase-matched second-harmonic generation is demonstrated in a mixed chalcopyrite crystal, AgGa(x)In(1-x)Se(2), and compared with that in an AgGaSe(2) crystal. Nonlinear coeff icients d(36) of AgGa(x)In(1-x)Se(2) and AgGaSe(2) crystals have also been derived.

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Generation of third harmonic of CO¾ laser radiation has been obtained in a type-II, AE cut 9 mm thick AgGaSe¾ crystal for the first time by sum-frequency-mixing of the fundamental with its second harmonic, the latter being obtained using another type-I, AE cut 11 mm thick AgGaSe¾ crystal. The energy conversion efficiencies obtained for second harmonic and third harmonic generations are 6.3% and 2.4% respectively with the input fundamental pump power density of 5.9 MW/cm ¾ only. The wavelength of the fundamental CO¾ laser radiation used for the generation of harmonics is 10.6 m, È (20) line. A compact TEA CO¾ laser source has been built in the laboratory.