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利用激光二极管(LD)抽运Nd∶YVO4晶体产生914 nm谱线振荡,再通过腔内倍频技术获得457 nm激光输出,是获得大功率蓝光激光器的一条重要的技术路线,因而实现高效率运转的914 nm激光输出则是方案的关键。报道了激光二极管端面抽运Nd∶YVO4晶体、连续波运转的大功率914 nm准三能级激光器,方案中采用掺杂原子数分数为0.1%的低掺杂Nd∶YVO4晶体,有效地降低了热效应的影响,并通过准三能级理论模型的模拟计算选择了最佳晶体长度;通过对腔镜介质膜参数的适当控制,有效地抑制了波长为1064 nm和1342 nm的高增益谱线。实验中,914 nm激光器的阈值抽运功率仅为8.5 W,在31 W的抽运功率下914 nm激光输出功率高达7.2 W,激光器的斜率效率为32%,光-光转换效率为23.2%。
Laser diode (LD) pumped Nd: YVO4 crystal 914 nm line oscillation, and then through the intracavity frequency doubling technology to obtain a 457 nm laser output, is to obtain a high-power blue laser an important technology route, enabling high-efficiency operation The 914 nm laser output is the key to the solution. A high-power 914 nm quasi-three-level laser with a Nd: YVO 4 crystal and a continuous wave driven by a laser diode is reported. The low doped Nd: YVO 4 crystal doped with 0.1% atomic fraction is effectively reduced Thermal effect. The optimal crystal length was selected through the simulation calculation of the quasi-three-level theoretical model. The high gain line with the wavelength of 1064 nm and 1342 nm was effectively suppressed by the proper control of the cavity dielectric film parameters. In the experiment, the threshold pumping power of the 914 nm laser was only 8.5 W, and the output power of the 914 nm laser was 7.2 W at the pumping power of 31 W. The slope efficiency of the laser was 32% and the light-to-light conversion efficiency was 23.2%.