Abstract
The nonlinear optical properties of a novel AgGa1-xInxSe2 crystal were investigated. Its absorption coefficients and band gap were determined at wavelength 0.8-19 μm. The coefficients of its Sellmeier dispersion equations were calculated by using linear interpolation based on the Sellmeier equations of pure AgGaSe2 and AgInSe2. The corresponding phase matching curves for the second harmonic generation (SHG) of CO2 laser radiation were calculated and plotted. The walk-off angle and accept angle curves were also determined and plotted. The measured phase matching angle θm and acceptance angle δθ·L are 68.5° and 3.66°·cm respectively for sample AgGa1-xInxSe2 (x=0.2).
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