Thermo-optic and electro-optic tuning sensitivities of the second-harmonic generation in KH2PO4 crystal measured by diverging beam technique

Abstract

Second-harmonic wave is generated in type-1 and type-2 cuts of KH2PO4 crystal by using a diverging Nd+3–glass laser beam. Angular full width at half-maximum of the conversion efficiencies are measured by recording the diverging output on photographic emulsion. Thermo-optic and electro-optic tuning sensitivities for the two types of crystal cuts are measured accurately from the recorded diverging output beam. The measured thermo-optic tuning sensitivities are 0.005 46±4×10−5 deg/°C for type-1 and 0.0143±4×10−4 deg/°C for type-2, and the measured electro-optic tuning sensitivities are 0.004 37±3×10−5 deg/kV cm for type-1, and zero for type-2.