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采用Nd∶YAG与Nd∶YVO4晶体组合应用的方案,将具有优良导热和光电性能的Nd∶YAG晶体作为抽运光的前端吸收晶体,其后端放置具有较宽吸收谱的Nd∶YVO4晶体,用来吸收由于谱宽不匹配而没有被Nd∶YAG晶体吸收的抽运光能量成分。两种晶体在波长1064nm处的发射谱相互重叠,其吸收的抽运光能量可以转化成共同波长的振荡激光,提高了抽运光的利用效率。这种组合应用的方式还可以有效抑制振荡光功率随抽运源工作温度变化而产生的波动。实验证明,采用这种激光晶体的组合应用方案,相对于单一Nd∶YAG晶体方案,激光器的光光转换效率可提升22.9%,输出功率对温度的敏感度由7%降到1%以内。
Nd:YAG crystal with excellent thermal conductivity and photoelectric properties was used as the front-end absorption crystal of pumping light and the Nd: YVO4 crystal with wider absorption spectrum was placed at the back end of the Nd: YAG crystal. Used to absorb pump light energy components that are not absorbed by Nd: YAG crystals due to spectral width mismatch. The emission spectra of the two crystals overlap each other at a wavelength of 1064 nm, and the energy of the absorbed pump light can be converted into an oscillating laser of a common wavelength, thereby improving the utilization efficiency of the pumping light. This combination of ways can also be used to effectively suppress fluctuations in the power of the oscillating pump as a function of the operating temperature of the pump source. Experiments show that with this combination of laser crystal applications, the laser light-to-light conversion efficiency can be increased by 22.9% and the output power sensitivity to temperature from 7% to less than 1% compared to a single Nd: YAG crystal.