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研究了一种低温条件下(120K以下)运行的光纤耦合激光二极管(LD)端面抽运的Tm…YAG激光器。LD中心波长为785nm(15℃),光纤芯径为400μm,数值孔径为0.22。Tm…YAG晶体尺寸3mm×3mm×8mm,Tm3+掺杂原子数分数为3%。采用一种新型小型脉冲管制冷机制冷,具有冷端无振动、结构简单、寿命长的优点。将制冷机冷头与包裹晶体的紫铜热沉连接以冷却晶体,并置于真空环境中,防止结霜现象的发生。通过控制晶体温度,得到了激光器在80~290K温区内,阈值功率和输出功率随工作温度的变化关系。在晶体温度为80K,抽运功率为9W时,得到功率为3.78W的2.013μm连续激光输出,光光效率为42%,斜率效率为44.9%。
A Tm ... YAG laser with fiber-coupled laser diode (LD) end-pumped at low temperature (below 120K) was studied. The LD center wavelength is 785 nm (15 ° C), the fiber core diameter is 400 μm and the numerical aperture is 0.22. Tm ... YAG crystal size of 3mm × 3mm × 8mm, Tm3 + doping atomic fraction of 3%. The use of a new type of small pulse tube refrigerator refrigeration, cold without vibration, simple structure, long life advantages. Connect the cold head of the refrigerator with the copper heat sink wrapped in the crystal to cool the crystal and place it in a vacuum environment to prevent frosting. By controlling the temperature of the crystal, the relationship between the threshold power and the output power with the operating temperature is obtained in the temperature range of 80 ~ 290K. At a crystal temperature of 80 K and a pumping power of 9 W, a 2.013 μm continuous laser output with a power of 3.78 W was obtained with an optical efficiency of 42% and a slope efficiency of 44.9%.