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通过分析含有热透镜的平平腔结构腔模及聚焦位置对倍频效率的影响,设计了聚焦位置不随入射高斯光束束腰大小而改变的倍频聚焦结构,进一步分析了周期极化晶体PPMg OLN的最佳匹配温度、温度和波长接收带宽等参数。实验上使用光纤耦合激光二极管泵浦Nd:YVO4,在最大30W泵浦功率时获得了14.3W多纵模1064nm激光输出,通过腔内插入双标准具,获得了12.3W单纵模输出。使用15×2.1×0.5mm的PPMg OLN分别对多纵模和单纵模基频光进行倍频,分别获得了0.97和1.16W绿光输出,相应转换效率为6.8%和9.4%。所得到的理论分析和实验结果可推广到连续光纤激光器腔外倍频产生绿光中。
By analyzing the influence of cavity mode and the focal position on the frequency doubling efficiency of the cavity, the double-frequency focusing structure whose focal position does not change with the size of the incident Gaussian beam waist is designed. The effect of PPMg OLN Best matching temperature, temperature and wavelength bandwidth and other parameters. In experiment, the Nd: YVO4 is pumped by a fiber-coupled laser diode, and a 14.3W multi-longitudinal mode 1064nm laser output is obtained at the maximum pump power of 30W. The dual-standard etalon is inserted into the cavity to obtain a 12.3W single longitudinal mode output. Multi-longitudinal mode and single-longitudinal mode fundamental frequency light were multiplied respectively by 15 × 2.1 × 0.5mm PPMg OLN to obtain 0.97 and 1.16W green light output respectively, the corresponding conversion efficiencies were 6.8% and 9.4%. The theoretical analysis and experimental results obtained can be generalized to the green light produced by continuous fiber laser doubling frequency doubling.