Pruneri V, Butterworth S D, Hanna D C
Opt Lett. 1996 Mar 15;21(6):390-2. doi: 10.1364/ol.21.000390.
We report on first-order quasi-phase-matched frequency doubling of picosecond pulses to the green, using a sample of periodically poled lithium niobate. In cw mode-locked operation, 330 mW of average green power was generated with an average conversion efficiency of ~52%. With a quasi-cw mode-locked pulse train an average conversion efficiency of ~65% was achieved, and 1.3 W of green power (average power within the 10-micros pulse envelope) was produced. At these powers there was no significant photorefractive damage, as confirmed by measured M(2) beam-quality factors of ~1.1 for both output fundamental and second-harmonic beams.
我们报道了利用周期性极化铌酸锂晶体，将皮秒脉冲一阶准相位匹配倍频至绿光波段的实验结果。在连续锁模运转模式下，产生了330 mW的平均绿光功率，平均转换效率约为52%。采用准连续锁模脉冲序列时，平均转换效率达到了约65%，产生了1.3 W的绿光功率（10微秒脉冲包络内的平均功率）。在这些功率水平下，未观察到明显的光折变损伤，输出基频光和二次谐波光束的M(2)光束质量因子测量结果均约为1.1，证实了这一点。
