Progress of mid-infrared solid-state laser
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摘要: 本文介绍了中红外固体激光器中新型的Fe2+: ZnSe激光器和基于MgO: PPLN、ZnGeP2晶体的光参量振荡器的发展现状,讨论了它们在发展过程中遇到的技术难题,探讨了中红外固体激光器的未来发展方向。波长为3~5 μm的中红外固体激光器具有效率高、体积小和重量轻等优点,在工业、医疗、军事等方面具有重要应用价值,研制大尺寸、高质量中红外激光晶体和输出波长更长的红外高功率激光泵浦源已成为中红外固体激光器未来发展方向之一。
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关键词:
- 固体激光器 /
- 中红外 /
- Fe2+: ZnSe激光器 /
- 光参量振荡器
Abstract: Mid-infrared solid lasers, such as new type of Fe2+: ZnSe laser and Optical Parameter Oscillator(OPO) based on MgO: PPLN, ZnGeP2 crystals, are reviewed in this paper. The scientific and technical problems of the mid-infrared solid laser are analyzed. The technical tendencies of mid-infrared solid laser are summarized. Based on the advantages of high efficiency, light weight and small volume, 3-5 μm mid-infrared solid-state laser sources have very important applications in the fields such as industry, medicine and military. The development of mid-infrared laser crystal with large bulk and high quality, and laser pump sources with high power and longer wavelength has become one of the developing trends for mid-infrared solid state laser in the future.-
Key words:
- solid-state laser /
- mid-infrared /
- Fe2+: ZnSe laser /
- Optical Parameter Oscillator(OPO)
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图 2 主动调Q Er∶Cr∶YSGG激光泵浦的Fe2+∶ZnSe激光器实验装置
Figure 2. Fe2+∶ZnSe laser pumped by active Q-switch Er∶Cr∶YSGG laser
图 3 双端面泵浦的Fe2+∶ZnSe激光器实验原理图
Figure 3. Schematic diagram of Fe2+∶ZnSe laser with double end pump
图 4 自由运转Er∶YAG激光器泵浦的Fe2+∶ZnSe激光器实验原理图
Figure 4. Schematic diagram of Fe2+∶ZnSe laser pumped by free-running Er∶YAG laser
图 5 HF激光泵浦的室温Fe2+∶ZnSe激光器实验原理图
Figure 5. Schematic diagram of Fe2+∶ZnSe laser pumped by HF laser at room temperature
图 6 高能量HF激光泵浦的室温Fe2+∶ZnSe激光器实验原理图
Figure 6. Schematic diagram of Fe2+∶ZnSe laser pumped by high energy HF laser at room temperature
图 7 基于MgO∶PPLN的OPO波长随晶体极化周期、温度调谐曲线
Figure 7. Output wavelength tuning curves of MgO∶PPLN OPO with polarized periods and temperature
图 8 双MgO∶PPLN的中红外OPO实验原理图
Figure 8. Experimental setup of the OPO based on twin-MgO∶PPLN cascaded
图 11 光纤泵浦的单谐振中红外OPO激光器
Figure 11. Single-resonator mid-infrared OPO laser pumped by Yb-Fiber laser
表 1 中红外ZnGeP2OPO主要参数
Table 1. Main parameters of mid-infrared ZnGeP2OPO
年代 研究单位 泵浦源(波长、能量/
功率、重频、脉宽)ZnGeP2晶体尺寸 中红外输出参数
(波长、能量/功率)转换效率 2010 Norwegiandefence research
establishment,Norway[37]Ho∶YAG，2.1 μm，39 W，45 kHz，32 ns 8.5 mm× 6 mm×8 mm 信号光3.9 μm，闲频光4.5 μm，22 W 光光效率58%，斜效率75% 2011 中国工程物理研究院[38] KTP OPO，2.1 μm，15 W，8 kHz 8 mm×6 mm× 18 mm 信号光4. 1μm，闲频 光4.32 μm，5.7 W 斜效率46.6% 2013 Defence Science and Technology
Organisation，Australia[39]Ho∶YAG，2.1 μm，62 W，35 kHz，50 ns 长度16 mm的两块 ZnGeP 2晶体串联 3～5 μm，27 W 光光效率62%，斜效率69% 2014 哈尔滨工业大学[40] Ho∶LuAG，2.1 μm，13.1 W，5 kHz 长度18 mm 3～5 μm，5.51 W 斜效率59% 2014 University of Central
Florida,USA[41]Tm∶fiber，1.98 μm，0.84 mJ，4 kHz，7 ns 12 mm× 5 mm×4 mm 3～5 μm，165 μJ，峰值功率28 kW 斜效率49% 2014 哈尔滨工业大学[42] Ho∶YAG，2.1 μm，107 W，20 kHz， 23 mm×6 mm×6 mm 两块晶体并联 信号光3.94 μm，闲 频光4.5 μm，41.2 W 斜效率44.6% 2015 French-German Research Institute
of Saint-Louis ISL，France[43]Tm∶fiber，1.98 μm，20 W，40 kHz，65 ns 18 m× 4 mm×4 mm 3～5 μm，6.5 W，40 kHz，45 ns 光光效率32%，斜效率40% 
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