Temperature Tuned 90° Phase-matched CO_2 laser doubling in AgGa_(1-x)I_xS_2 Crystal

摘要

90° phase-matched type-I second harmonic generation (SHG) of CO_2 laser radiation at 10.591μm is demonstrated at 203℃ in mixed chalcopyrite AgGa_(1-x)In_xS_2 crystal with x = 0.14 ± 0.01. In addition, temperature-tuned difference frequency generation (DFG) at 4.02μm is obtained by mixing the idler output of a Nd: YAG third harmonic pumped β-BBO optical parametric oscillator and its fundamental source at 1.0642μm. The Sellmeier and thermo-optic dispersion formulas that reproduce well these experimental results are presented.