光子学报, 2012, 41 (6): 708, 网络出版: 2012-06-19
KGW 晶体外腔式高功率579 nm喇曼黄光激光器
KGW External Resonator High Power 579 nm Raman Yellow Laser
摘要
报道了579 nm高功率KGd(WO4)2喇曼晶体外腔式喇曼黄光激光器的输出特性.基于808 nm脉冲激光二极管侧面泵浦Nd∶YAG陶瓷、腔内BBO电光晶体同步延迟调Q和Ⅰ类临界相位匹配的LBO晶体腔外倍频方案,并通过外腔式KGW晶体Ng轴二阶斯托克斯喇曼频移,获得了579.54 nm黄光激光输出.当脉冲信号重复频率为1 kHz、532 nm泵浦光最高平均功率为5.02 W、脉冲宽度为10.1 ns时,获得了最高平均功率2.58 W、脉冲宽度7.4 ns、峰值功率348.6 kW的579.54 nm二阶斯托克斯喇曼黄光激光输出;532 nm至579.54 nm的光光转化效率为51.4%、斜率效率为54.8%,光束质量因子M2x-579.54=5.829、M2y-579.54=6.336,输出功率不稳定性小于±2.35%.实验表明:外腔式喇曼结构能够高效地获得喇曼黄光,具有很高的光光转化效率及良好的功率稳定性,并通过脉冲LD结合同步延迟电光调Q可获得高重复频率、高平均功率、窄脉冲宽度和高峰值功率的黄光激光输出.
Abstract
The output characteristics of 579 nm high power resonator KGd(WO4)2 Raman yellow laser were reported. 579.54 nm yellow laser was generated based on 808nm pulse LD sidepumped ceramic Nd∶YAG, BBO electrooptical Qswitched and typeI critical phasematching LBO crystal extracavity frequency doubling project. With the 5.02 W, 10.1 ns and 1 kHz output power pumped at 532 nm, the laser produced high average power of 2.58 W and pulses of 7.4 ns duration secondStokes wavelength at 579.54 nm. Conversion efficiency was 51.4% and slope efficiency was 54.8%. The beam quality factors M2 of 579.54 nm were M2x-579.54=5.829, M2y-579.54=6.336 and power instability less than ±2.35%. Experimental results indicate that external resonator Raman structure is an effective method for obtaining Raman yellow laser with its high opticaltooptical conversion and good power stability. Moreover, the additional usage of pulse LD with synchronous electrooptical Qswitch could generate high repetition rate, high average power, narrow pulse width and high peak power yellow laser.
金辰杰, 李力飞, 任兆玉, 白晋涛, 白杨, 贺庆丽. KGW 晶体外腔式高功率579 nm喇曼黄光激光器[J]. 光子学报, 2012, 41(6): 708. JIN Chenjie, LI Lifei, REN Zhaoyu, BAI Jintao, BAI Yang, HE Qingli. KGW External Resonator High Power 579 nm Raman Yellow Laser[J]. ACTA PHOTONICA SINICA, 2012, 41(6): 708.