2.94 μm室温连续Er:YAG激光器的研制

刘政邑; 叶先林; 张淞; 魏星斌; 任怀瑾; 王卫民

doi:10.11884/HPLPB202335.220391

2.94 μm室温连续Er:YAG激光器的研制

doi: 10.11884/HPLPB202335.220391

刘政邑^{1, 2, 3,},
叶先林^{1, 2},
张淞^{1, 2, 3},
魏星斌^{1, 2, ,},
任怀瑾^{1, 2},
王卫民^{1, 2}

1.
中国工程物理研究院应用电子学研究所，四川绵阳 621900
2.
中国工程物理研究院高能激光科学与技术重点实验室，四川绵阳 621900
3.
中国工程物理研究院研究生院，北京 100088

基金项目: 中国工程物理研究院创新发展基金项目

详细信息

作者简介:
刘政邑，15927397317@163.com

通讯作者:
魏星斌， wishingbeing@hotmail.com

中图分类号: TN248.1
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- 文章访问数: 925
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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-17
- 修回日期: 2023-02-27
- 录用日期: 2023-02-27
- 网络出版日期: 2023-03-13
- 刊出日期: 2023-06-15

Development of 2.94 μm room temperature CW Er:YAG laser technology

Liu Zhengyi^{1, 2, 3
,},
Ye Xianlin^{1, 2},
Zhang Song^{1, 2, 3},
Wei Xingbin^{1, 2
, ,},
Ren Huaijin^{1, 2},
Wang Weimin^{1, 2}

1.
Institute of Applied Electronics, CAEP, Mianyang 621900, China
2.
Key Laboratory of Science and Technology on High Energy Laser, China Academy of Engineering Physics, Mianyang 621900, China
3.
Graduate School of China Academy of Engineering Physics, Beijing 100088, China

摘要

摘要: 研制了一种结构简单的LD端面泵浦2.94 μm Er:YAG连续激光器。该激光器采用双端键合YAG端帽方式降低了晶体的端面温度。泵浦源采用小芯径的输出光纤和非球面镜耦合系统，减小了小泵浦光斑在晶体中的发散速度，并提高了泵浦均匀性。当泵浦光波长为969.7 nm时，Er:YAG晶体前段对泵浦光的吸收较弱，因此激光器增益介质前端热聚集效应得到了缓解。通过热像仪在实验中对键合和非键合Er:YAG晶体端面温度进行观测对比，并使用COMSOL软件对激光器热分布进行了模拟分析，证明了上述措施对减小高掺杂Er:YAG晶体热效应的有效性。最终成功实现了155 mW的2.94 μm连续激光输出。另外还观测到激光器输出波长随泵浦功率增加的红移现象并对其在能级跃迁层面进行了理论解释。
- 2.94 μm连续激光器 /
- Er:YAG激光器 /
- 泵浦波长 /
- 非球面耦合 /
- 键合晶体
Abstract: In this paper, we report a simple structure, room-temperature operation, LD end-pumped 2.94 μm Er:YAG continuous wave laser. The laser uses double-ended bonded YAG end caps to reduce the end-surface temperature of the crystal. The pump source uses a small core diameter output fiber and an aspheric mirror coupling system, which reduces the dispersion rate of small pump spots in the crystal and therefore improves pumping uniformity. When the pump light wavelength is 969.7 nm, the absorption of pump light in the front section of Er:YAG crystal is weak, accordingly the thermal aggregation effect of the front end of the laser gain medium is mitigated. We observed and compared the temperature of the end faces of bonded and non-bonded Er:YAG crystals with a thermal imaging camera, simulated the thermal distribution using COMSOL software, and proved the effectiveness of the above measures in reducing the thermal effect of highly doped Er:YAG crystal. We finally succeeded in achieving a continuous laser output of 2.94 μm at 155 mW. We also observed the output wavelength’s red-shift phenomenon with the pump power increase and explained it theoretically at the energy transfer level.
- 2.94 μm CW laser /
- Er:YAG laser /
- pump wavelength /
- aspherical coupling mirror /
- bonding crystals

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图 1 Er:YAG激光器实验装置图

Figure 1. Experimental setup of Er:YAG laser

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图 2 晶体前端面温度分布

Figure 2. Temperature distribution of the front surface of the crystal

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图 3 键合/非键合晶体温度分布曲线

Figure 3. Temperature distribution curves of bonded/non-bonded crystal

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图 4 晶体内部温度分布剖面模拟图

Figure 4. Simulated temperature distribution profile

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图 5 泵浦光吸收和温度分布曲线

Figure 5. Pump light absorption and temperature distribution curves

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图 6 输出功率和光束质量

Figure 6. Output power and beam quality

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图 7 不同输出功率时的光谱

Figure 7. Spectra at different output power

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图 8 Stark能级分布

Figure 8. Stark energy level distribution

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表 1 泵浦波长随冷却温度的变化

Table 1. Pump wavelength with different cooling temperature

temperature/℃	wavelength/nm
18	964.8
24	967.4
30	969.7
36	972.2

下载: 导出CSV

参考文献(16)

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