Abstract
The investigation of the thermo-optic coupling process of AgGaSe2 crystal was carried out via pulsed CO2 laser during doubling frequency at wavelength of 9.6 µm. To further detecting the thermal anisotropic property of AgGaSe2, a thermo-optic coupling model of the nonlinear crystal under IR frequency was constructed, following the coupling process was simulated according to this model. The simulation results present the intensities of the fundamental and harmonic beams, transformation efficiency and temperature distributions during the evolution process in detail. At the same time, temperature distribution has been identified that influence the conversion efficiency and light intensity significantly. Consequently, data provide fruitful evidences that compensation for the phase mismatch induced by the thermal effect is an outstanding approach in recovering the reduction of conversion efficiency compared with the temperature control.
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