Chiang A C, Huang Y C, Fang Y W, Chen Y H
Opt Lett. 2001 Jan 15;26(2):66-8. doi: 10.1364/ol.26.000066.
We report the first demonstration to our knowledge of 220-ps visible laser generation from passively Q-switched-laser pumped periodically poled lithium niobate (PPLN) in a single-pass, cascaded frequency-conversion process. The monolithic PPLN consists of a 1-cm section for frequency doubling the 1064-nm Nd:YAG pump laser to a 532-nm laser and a subsequent 4-cm section for generating the visible laser in a 532-nm-pumped optical parametric generation (OPG) process. In generating the 622.3-nm OPG signal wavelength we measured a 3.0-microJ/pulse pump threshold at the 1064-nm wavelength, 16% overall efficiency, and 35% slope efficiency at two times threshold. At 10(-6) pump duty cycle and 20-mW average power in the visible, photorefractive damage was not observed at the phase-matching temperature of 40.3 degrees C.
据我们所知，我们首次展示了在单次级联频率转换过程中，由被动调Q激光泵浦的周期性极化铌酸锂（PPLN）产生220皮秒可见激光。单片PPLN由一个1厘米长的部分组成，用于将1064纳米的Nd:YAG泵浦激光倍频为532纳米激光，随后是一个4厘米长的部分，用于在532纳米泵浦的光参量产生（OPG）过程中产生可见激光。在产生622.3纳米的OPG信号波长时，我们在1064纳米波长下测量到3.0微焦/脉冲的泵浦阈值、16%的总效率以及两倍阈值时35%的斜率效率。在10^(-6)的泵浦占空比和可见光下20毫瓦的平均功率下，在40.3摄氏度的相位匹配温度下未观察到光折变损伤。
