KGW 晶体外腔式高功率579 nm喇曼黄光激光器

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M_x-579.54²=5.829、M_y-579.54²=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.

KGW External Resonator High Power 579 nm Raman Yellow Laser

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 side-pumped ceramic Nd:YAG, BBO electro-optical Q-switched and type-I critical phase-matching 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 second-Stokes 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 M_x-579.54²=5.829, M_y-579.54²=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 optical-to-optical conversion and good power stability. Moreover, the additional usage of pulse LD with synchronous electro-optical Q-switch could generate high repetition rate, high average power, narrow pulse width and high peak power yellow laser.