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Thermally boosted pumping of neodymium lasers

机译：钕激光器的热增强泵浦

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摘要

Pumping at 885 nm from thermally excited ground-state levels directly to the Nd:YAG upper lasing level is experimentally demonstrated by use of a Ti:sapphire pump laser. This approach utilizes thermal energy contained within the laser medium to provide part of the pump energy required to achieve population inversion. Slope efficiency increased by 12% compared with traditional pump band excitation (λ_(pump)=808 nm) and by 7% compared with ground-state direct pumping (λ_(pump)=869 nm). The combined transition from the first and second thermally excited Stark components of the ground state (~(4)I_(9/2)) to the upper lasing level (~(4)F_(3/2)) has characteristics that make thermally boosted pumping a suitable candidate for use with diode lasers: reasonable absorption (1.8 cm~(-1)) and bandwidth (2.7 nm FWHM). A model suggests that, compared with traditional 808-nm pumping, heat could be reduced by 40% by use of thermally boosted pumping.
机译：通过使用Ti：蓝宝石泵浦激光器实验证明了在885 nm处从热激发基态能级直接泵浦到Nd：YAG上激光能级。该方法利用激光介质中包含的热能来提供实现粒子数反转所需的泵浦能量的一部分。与传统的泵浦带激励（λ_（pump）= 808 nm）相比，斜率效率提高了12％，与基态直接泵浦（λ_（pump）= 869 nm）相比，斜率效率提高了7％。从基态的第一和第二热激发Stark分量（〜（4）I_（9/2））到最高激光能级（〜（4）F_（3/2））的组合跃迁具有使增强了泵浦二极管激光器的合适候选人：合理的吸收（1.8 cm〜（-1））和带宽（2.7 nm FWHM）。一个模型表明，与传统的808 nm抽运相比，通过使用热增强抽运可以将热量减少40％。

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