Feasibility of Fe2+: ZnSe laser pumped by continuous wave HF laser
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摘要: 针对目前Fe2+: ZnSe激光器缺乏有效的高功率泵浦源这一关键瓶颈，提出了采用连续波HF化学激光器泵浦Fe2+: ZnSe来实现4 μm波段激光输出的技术路线，结合实验和理论手段考察了此技术路线的可行性。首次获得了由连续波HF化学激光泵浦的Fe2+: ZnSe激光器的W级激光输出，输出功率约为1.7 W，谱线峰值波长为4.18 μm，出光时间约2 s。
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关键词:
- 4 μm波段激光 /
- Fe2+: ZnSe激光器 /
- HF化学激光器 /
- 功率放大 /
- 热管理
Abstract: In view of the key bottleneck that Fe2+: ZnSe laser lacks effective high-power pumping source at present, the technical route of using a continuous wave HF chemical laser to pump Fe2+: ZnSe to achieve laser output in 4 μm band is proposed. The feasibility of this technical route is investigated both experimentally and theoretically. The output of a continuous wave HF chemical laser pumped Fe2+: ZnSe laser at watt level is obtained for the first time. The output power is about 1.7 W, the central wavelength is 4.18 μm, and the lasing lasts about 2 s.-
Key words:
- 4 μm band laser /
- Fe2+: ZnSe laser /
- HF chemical laser /
- power amplifier /
- thermal management
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图 1 连续波HF化学激光器泵浦Fe2+: ZnSe晶体的原理性示意图
Figure 1. Schematic diagram of continuous wave HF chemical laser pumped Fe2+: ZnSe laser crystal
图 2 HF全谱激光泵浦时的泵浦和输出光谱图
Figure 2. Pump and output spectrum when pumped by full spectrum HF laser
图 3 2900 nm窄带激光泵浦时的输出激光光谱
Figure 3. Output spectrum when pumped by narrow band laser at 2900 nm
图 6 不同厚度碟片晶体、铟和热沉下晶体上表面的径向温度分布
Figure 6. Radial temperature distribution on the top surface of disk crystal with different thickness of disk crystal, indium plate and heat spreader
图 7 不同射流温度下晶体上表面的径向温度分布
Figure 7. Radial temperature distribution on the top surface of disk crystal with different cooling temperature
图 8 不同泵浦功率密度下最大输出功率和光光转化效率随输出耦合率的变化
Figure 8. Output power and optical-optical conversion efficiency vs output coupling rate with different pump power density
图 9 不同ASE阈值下最大输出功率随耦合率的变化
Figure 9. Output power vs output coupling rate with different ASE threshold
图 10 不同腔内损耗下最大输出功率随耦合率的变化
Figure 10. Output power vs output coupling rate with different cavity loss
表 1 各材料的物性参数
Table 1. Physical properties of materials
material radius/mm thickness/mm thermal expansion
coefficient/℃−1Young’s
modulus/PaPoisson’s
ratiothermal conductivity/
(W·m−1·℃−1)disk 25 1.00 7.10×10−6 7.03×1010 0.28 18 indium 25 0.10 3.20×10−5 1.10×1010 0.45 82 heat spreader 40 1.20 7.40×10−6 2.60×1011 0.288 142 
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