宽温范围LD端泵Nd:YAG激光器泵浦源光谱理论优化  

Theoretical Optimization for Spectrum of Pump Source of LD End Pumped Nd:YAG Laser in Wide Temperature Range

作　　者：彭春[1] 陈仁[1] 刘亚萍[1] 吴振宇[1] 罗杰平 李勤财 牟惠蓉 Peng Chun;Chen Ren;Liu Yaping;Wu Zhenyu;Luo Jieping;Li Qincai;Mu Huirong(Southwest Institute of Technical Physics,Chengdu,Sichuan 610041,China)

机构地区：[1]西南技术物理研究所,四川成都610041

出　　处：《光学学报》2022年第4期109-118,共10页Acta Optica Sinica

摘　　要：为实现二极管泵浦激光器在宽温度环境下免温控稳定工作,分析了激光器泵浦源发射光谱对激光系统稳定性的影响。综合考虑了泵浦过程中的能量利用率,提出了激光器免温控泵浦源光谱优化设计方案。所提方案可有效降低泵浦源波长漂移对激光器系统吸收率和热焦距的影响,实现激光器宽温度范围内免温控工作。在-40~60℃工作温区内,计算了不同吸收长度和掺杂浓度(原子数分数)的Nd:YAG激光器系统泵浦源的最优发射光谱。从理论角度而言,与一般无温控单波长激光二极管(LD)泵浦源相比,利用所提优化方案获得的泵浦源,可以将激光器系统的工作稳定性明显提高,将系统的泵浦光吸收率波动和晶体热焦距波动分别降低到13%和16%以内。对吸收长度为30 mm,掺杂浓度为0.8%的Nd:YAG激光器系统,设计了一种双波长LD泵浦源(中心波长为803.7 nm@10℃和809.2 nm@10℃,对应比重为68.4%和31.6%)。模拟结果表明,在-40~60℃温度范围内,晶体对该泵浦光的吸收率可保持在90.7%以上,泵浦光吸收稳定性和晶体热焦距稳定性分别为91.4%和85.4%。To enable the stable operation of diode-pumped lasers without temperature control in a wide temperature range,the influence of the emission spectra of laser pump sources on the stability of laser systems is analyzed.Taking into account the energy utilization efficiency of the pumping process,an optimization scheme for the pump source spectra of lasers without temperature control is proposed.The scheme can effectively reduce the influence of the wavelength drift of pump sources on the absorption efficiency and thermal focal length of laser systems,thus making lasers work stably in a wide temperature range without temperature control.In the operating temperature range from-40℃to 60℃,the optimal emission spectrum of a pump source is calculated for a Nd:YAG laser system with different absorption lengths and doping concentrations(atomic number fractions).In theory,compared with a conventional single-wavelength laser diode(LD)pump sourse without temperature control,the pump source designed by this scheme can significantly improve the working stability of laser systems and reduce the fluctuations of absorption efficiency and thermal focal length to less than 13%and 16%respectively.A LD pump source with two wavelengths(803.7 nm@10℃and 809.2 nm@10℃with proportions of 68.4%and 31.6%respectively)is designed for the Nd:YAG laser system with an absorption length of 30 mm and a doping concentration of 0.8%.The simulation results show that within the temperature range from-40℃to 60℃,the absorption efficiency of pump light remains above 90.7%,and the absorption stability and thermal focal length stability are 91.4%and 85.4%,respectively.

关 键 词：激光器 二极管泵浦 光谱优化 多波长泵浦 

分 类 号：TN242[电子电信—物理电子学]