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4 November 2010 Performance comparison of nonlinear crystals for frequency doubling of an 894nm Cs vapor laser
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An examination of the efficiencies of three commonly used nonlinear crystals (PPKTP, LBO, and BiBO) when generating second harmonic of a Cesium laser is presented. The experiment investigates both the intracavity and single pass second harmonic generation of 895 nm Cs laser light when operating in quasi-CW and in CW modes and pumped by several watts. A degradation of the conversion efficiencies for each crystal was observed when high fundamental powers or a high duty cycle of the pump were used. For a Cs laser operating at 894nm, PPKTP is found to be the optimal crystal for intracavity SHG in both pulsed and CW modes when operating at SHG powers of several watts. At higher powers, however, the increased absorption coefficient of PPKTP at 447nm, compared to that of BiBO or LBO, may become significant to where another crystal will be more appropriate for this application. Maximum blue light power obtained with PPKTP crystal was about 1.5W in CW mode and 2.5W in QCW.
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B. V. Zhdanov, M. K. Shaffer, Y. Lu, B. Naumann, T. Genda, and R. J Knize "Performance comparison of nonlinear crystals for frequency doubling of an 894nm Cs vapor laser", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460B (4 November 2010);

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