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High-efficiency blue generation by frequency doubling of femtosecond pulses in a thick nonlinear crystal

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Abstract

We have demonstrated highly efficient frequency doubling of femtosecond pulses in a thick, noncritically phase-matched KNbO3 crystal under conditions of large group-velocity mismatch. At low power we observed a slope efficiency of 300% nJ-1 for harmonic conversion, and at higher powers we generated 170 mW of second-harmonic blue output for 300 mW of input light. Furthermore, we have shown that the focusing dependence for our conditions of large group-velocity mismatch is considerably different from that obtained for frequency doubling of continuous-wave light. We have also demonstrated that one can tune the spectral width of the generated blue light by varying the focusing conditions.

© 1998 Optical Society of America

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