高效率Nd:YVO_4/LBO临界相位匹配脉冲绿光激光器

High efficiency Nd:YVO_4/LBO critical phase matching green laser

报道了一种利用激光二极管(LD)端面泵浦Nd:YVO4晶体,声光调Q,LBO临界相位匹配腔内倍频的高效率、小体积、风冷绿光激光器。分析了不同偏振光泵浦的情况下,激光晶体对泵浦光的吸收特性。由分析得出,采用部分偏振光泵浦,可以提高激光晶体对泵浦光吸收均匀性,改善基波畸变,获得高转换效率激光输出。实验中,在泵浦光功率为33W、声光调Q重复频率为20kHz时,得到脉宽为23.96ns、平均功率为15W的1064nm基频光输出。经倍频后,得到平均功率为11.2 W的绿光输出,倍频效率为74.6%,总体光-光转换效率为34%。在输出功率为10W时,测得1h内输出功率不稳定度为0.512 2%,水平方向和竖直方向的光束质量因子M2分别为1.2和1.1。

A high efficiency, composite and air cooling LD end pumped Nd： YVO4 , acoustooptic （AO） Qswitched, and LBO（critical phase matching） intracavity doubled allsolidstate green laser is reported. By analyzing the absorption characteris tics, with different polarized light pump, the uniformity of the crystal absorption could be significantly improved when the gain medium was pumped with partially polarized light. The fundamental wave distortion could be improved and the conversion effi ciency could be enhanced. When the incident pump power was 33 W, the repetition rate of the AOQ switch was 20 kHz, a 1064 nm fundamental frequency laser with an output power of 15 W and a pulse width of 23.96 ns was obtained. The output power of 532 nm green laser was 11.2 W. The optical to optical conversion efficiency from diode to green and from IR to green laser were about 34% and 74.6%. The output power instability was 0. 512 2% at the output power of 10 W, the/V/2 beam quality factor was 1.2 in the horizontal direction and 1.1 in the vertical direction .