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基于脉冲管制冷机的低温Tm:YAG激光器

Cryogenic Operation of Tm:YAG Laser Based on Pulse Tube Cooler

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摘要

研究了一种低温条件下(120 K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785 nm(15 ℃),光纤芯径为400 μm,数值孔径为0.22。Tm:YAG晶体尺寸3 mm×3 mm×8 mm,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80~290 K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80 K,抽运功率为9 W时,得到功率为3.78 W的2.013 μm连续激光输出,光光效率为42%,斜率效率为44.9%。

Abstract

A fiber-coupled laser diode (LD) end-pumped Tm:YAG laser operated under cryogenic condition is studied. The central wavelength of the fiber-coupled LD is 785 nm at 15 ℃, with fiber core diameter of 400 μm and numerical aperture of 0.22. The Tm:YAG crystal, with the dimension of 3 mm×3 mm×8 mm, is doped with Tm3+ with atomic fraction of 3%. Pulse tube cryocooler used to cool the crystal in the experiment is a new type of micro-cryocooler with the advantages of no vibration in the cold end, simple structure and long lifetime. The copper heat embedded with Tm:YAG crystal is attached to the cold head of the cryocooler and then fixed in a vacuum chamber to prevent frost. By adjusting the crystal temperature, the dependence of threshold and output power of Tm:YAG laser on crystal temperature in the range of 80~290 K is investigated. When the crystal temperature is 80 K, the highest continuous wave output power of 3.78 W at 2.013 μm under the pumping power of 9 W is achieved, corresponding to optical-optical conversion efficiency of 42%, and slope efficiency of 44.9%.

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中图分类号:TN248.1

DOI:10.3788/cjl201441.0102001

所属栏目:激光物理

收稿日期:2013-08-09

修改稿日期:2013-08-27

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作者单位    点击查看

张斌:中国科学院理化技术研究所, 北京 100190中国科学院大学, 北京 100049
李建国:中国科学院理化技术研究所, 北京 100190
蔡京辉:中国科学院理化技术研究所, 北京 100190

联系人作者:张斌(zhangbin86.32@163.com)

备注:张斌(1986—),男,博士研究生,主要从事脉冲管制冷机与固态激光器耦合等方面的研究。

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引用该论文

Zhang Bin,Li Jianguo,Cai Jinghui. Cryogenic Operation of Tm:YAG Laser Based on Pulse Tube Cooler[J]. Chinese Journal of Lasers, 2014, 41(1): 0102001

张斌,李建国,蔡京辉. 基于脉冲管制冷机的低温Tm:YAG激光器[J]. 中国激光, 2014, 41(1): 0102001

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