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报道了一台采用激光二极管(LD)侧面抽运Nd∶YAP晶体的全固态腔内三倍频447 nm连续(CW)蓝光激光器。对几种常用的晶体进行分析对比后,选取Nd∶YAP晶体作为增益介质产生1341.4 nm基频光,腔内采用Ⅰ类临界相位匹配(CPM)LBO晶体进行倍频(SHG)产生670.7 nm波长激光,基频光与倍频红光再经Ⅱ类临界相位匹配的KTP晶体和频(SFM)获得447.1 nm蓝光输出。采用四镜折叠腔结构,通过谐振腔稳定性分析,优化选取了合适的谐振腔参数。实验对比了不同腔长的输出特性,最终在534 W抽运功率下,获得了最高功率为114 mW的连续447.1 nm蓝光输出,光-光转换效率为0.02%,并分析了效率低的原因。
Reported an all-solid-state triple-frequency, 447-nm continuous-wave (CW) blue laser using a laser diode (LD) side-pumped Nd:YAP crystal. After analyzing and comparing several commonly used crystals, Nd: YAP crystal was selected as the gain medium to produce 1341.4 nm fundamental frequency light, and the cavity was internally subjected to frequency doubling (SHG) with Class I critical phase matching (CPM) LBO crystal to generate a 670.7 nm laser , And the blue light output of 447.1 nm was obtained by KTP crystal and SFM with fundamental frequency and frequency doubling red and phase Ⅱ critical phase matching. Using the four mirror folded cavity structure, through the analysis of the stability of the resonator, the optimal parameters of the resonator are optimized. The output characteristics of different cavity lengths are compared experimentally. Finally, a continuous 447.1 nm blue output with a maximum power of 114 mW is obtained at a pumping power of 534 W, and the light-to-light conversion efficiency is 0.02%. The reason for the low efficiency is also analyzed.