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为了实现激光器在一定温度范围内LD泵浦源免温控稳定工作,具有较高并且稳定的泵浦光吸收效率,分析了DPL激光器中LD发射谱和Nd:YAG增益介质吸收谱的特点及匹配问题,据此提出了一种激光器免温控泵浦源的多波长选择理论和方法,同时增加泵浦光吸收长度克服Nd:YAG吸收谱和LD波长失配的不利影响。优化设计了一个波长为802.35 nm@25℃、813.15 nm@25℃和810.95 nm@25℃的三波长LD泵浦方案,计算结果表明:在一定吸收长度下,多波长泵浦光吸收效率可达73.96%,并且在-15.7~65.7℃宽温度波动范围内,激光器输出能量不稳定度优于5%。同时还模拟分析了增益介质吸收长度和掺杂浓度对泵浦光吸收效率的影响。
In order to realize stable and stable pump light absorption efficiency of LD pump source in a certain temperature range, the characteristics of LD absorption spectrum and Nd: YAG gain medium absorption spectrum in DPL laser were analyzed. In this paper, a multiwavelength selection theory and method for pump temperature-free pump is proposed. At the same time, increasing the pump light absorption length overcomes the adverse effect of Nd: YAG absorption spectrum and LD wavelength mismatch. A three-wavelength LD pumping scheme with wavelength of 802.35 nm @ 25 ° C, 813.15 nm @ 25 ° C and 810.95 nm @ 25 ° C has been designed and optimized. The results show that the absorption efficiency of multi-wavelength pump light is up to a certain absorption length 73.96%, and the laser output energy instability is better than 5% within the wide temperature fluctuation range of -15.7 ~ 65.7 ℃. At the same time, the influence of absorption length and doping concentration of gain medium on the absorption efficiency of pump light was also simulated.