Influence of composition ratio on second harmonic generation and optical parametric oscillation of CdGe(As1-xPx)2

Based on the theories of phase matching and acceptable composition ratio, the influence of composition ratio on the frequency conversions of CdGe(As1-xPx)2 was investigated. In consideration of Sellmeier equations, phase matching diagrams of second harmonic generation and optical parametric oscillations pumped by the popular Ho3+:YLF and Cr:Er:YSGG lasers were calculated, as well as acceptable composition ratios with various compositions. It is shown that the second harmonic generation of noncritical phase matching can be realized in 2~9 μm and parametric light in 2~18 μm can be generated by optical parametric oscillations. Acceptable composition ratios decrease approximately linearly with composition ratio, and show different tendencies with changing wavelengths.