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利用光纤耦合输出的半导体激光器(LD)端面抽运Nd∶YVO4晶体,激光谐振腔采用四镜环形腔结构,通过KTP晶体内腔倍频,获得了高功率全固态连续单频绿光激光输出。根据临界相位匹配下椭圆高斯光束的倍频理论,通过旋转Nd∶YVO4晶体的方向选取合适的基频光偏振方向,使KTP晶体的走离角所在平面与谐振腔弧矢面平行,可提高内腔倍频转换效率。当抽运功率为20 W时,激光器最大单频绿光输出功率达4.8 W。作为对比,控制基频光偏振方向使KTP晶体的走离角所在平面与谐振腔子午面平行时,激光器最大单频绿光输出功率为4.1 W。对比两种情形下的实验结果,激光器的光-光转换效率从21.8%提高到25.5%。
The Nd: YVO4 crystal is pumped by the end face of a semiconductor laser (LD) with fiber-coupled output. The four-mirror ring cavity is used as the laser resonator. The high-power all-solid-state continuous single-frequency green laser is obtained by double- According to the theory of frequency doubling of elliptic Gaussian beams under critical phase matching, the polarization direction of the fundamental frequency light is selected by rotating the Nd: YVO4 crystal so that the KTP crystal is parallel to the sagittal plane of the resonant cavity, Frequency conversion efficiency. When the pumping power is 20 W, the maximum single green laser output power reaches 4.8 W. In contrast, when the polarization direction of the fundamental frequency light is controlled so that the KTP crystal is parallel to the meridional plane of the resonator, the maximum single green laser output power is 4.1 W. Comparing the experimental results of the two cases, the light-to-light conversion efficiency of the laser is increased from 21.8% to 25.5%.