Phase-matching temperature shifts in blue generation by frequency doubling of femtosecond pulses in KNbO3
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چکیده
We have demonstrated temperature rises that result from nonlinear absorption in single-pass frequencydoubling experiments using femtosecond pulses and a 3-mm-thick KNbO3 crystal. These temperature changes shift the phase-matching curve and must be accounted for to optimize the conversion efficiency. We obtained a maximum second-harmonic generation (SHG) efficiency of 66% at an input power of 107 mW and a slope efficiency of ;1.5%/mW at low input powers. We have investigated, for the first time to our knowledge, the focusing dependence of the phase-matching temperature. We have also found that the temperaturedependent SHG efficiency in femtosecond SHG experiments is significantly different from that obtained for frequency doubling of continuous-wave light. © 1999 Optical Society of America [S0740-3224(99)01008-5] OCIS codes: 190.0190, 190.2620, 190.4160, 320.2250, 320.7110, 320.0320.
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تاریخ انتشار 1999