光学学报, 2020, 40 (16): 1614001, 网络出版: 2020-08-07
基于空芯光纤的光泵浦4 μm连续波HBr气体激光器 
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Optically Pumped 4 μm CW HBr Gas Laser Based on Hollow-Core Fiber
图 & 表
图 1. HBr分子的特性。(a) HBr分子产生4 μm波段激光的能级跃迁示意图;(b) H79Br分子在2 μm波段的吸收谱;(c) H79Br分子在4 μm波段的发射谱
Fig. 1. Characteristics of HBr. (a) Schematic diagram of energy level transition of HBr molecules depicting 4 μm laser; (b) absorption spectrum of H79Br molecules at 2 μm band; (c) emission spectrum of H79Br molecules at 4 μm band
图 3. 可调谐2 μm光纤泵浦源输出特性。(a)可调谐输出光谱;(b) R(2)吸收线附近的光谱细节图;(c)中心波长随归一化调节电压的变化;(d)输出功率随793 nm半导体激光器功率的变化
Fig. 3. Output characteristics of the tunable 2 μm fiber pump source. (a) Tunable output spectrum; (b) fine spectrum at R(2) absorption line; (c) measured wavelength change with the normalized tuning voltage; (d) output laser power change with the power of 793 nm LD
图 4. 泵浦源线宽特性。(a) F-P干涉仪测量泵浦源线宽实验结构图;(b)线宽测量结果
Fig. 4. Characteristics of the pump laser linewidth. (a) Experimental setup for the measurement of the pump laser linewidth by F-P interferometer; (b) measured results of laser linewidth
图 5. 实验装置(插图为空芯光纤横截面电镜图)
Fig. 5. Experimental setup (inset is the electron micrograph of hollow fiber cross section)
图 6. HBr吸收线宽及泵浦源波长稳定性。(a)测得的1.8 mbar和4.1 mbar HBr分子R(2)吸收线线宽;(b)泵浦源波长在R(2)吸收线中心时残余的泵浦光随时间的变化
Fig. 6. Absorption linewidth of HBr and the wavelength stability of pump source. (a) Measured HBr molecule absorption linewidth around R(2) absorption line at 1.8 mbar and 4.1 mbar; (b) residual pump power with respect to time when tuned at center of R(2) absorption line
图 7. 输出的4 μm光谱图(插图为R(2)吸收线产生P(4)和R(2)发射线的能级跃迁图)
Fig. 7. Output 4 μm spectrum(inset is energy transition diagram of HBr for P(4) and R(2) emissions when pumped at R(2) absorption line)
图 8. 4 μm激光输出功率特性。(a)不同气压下4 μm输出功率随入射泵浦光功率的变化;(b)不同气压下转化效率随入射泵浦光功率的变化;(c)不同气压下4 μm输出功率随耦合的泵浦光功率的变化;(d)不同气压下转化效率随耦合的泵浦光功率的变化;(e)被吸收的泵浦光功率随耦合泵浦光功率的变化;(f)被吸收的泵浦光功率和最大输出的4 μm激光功率随气压的变化
Fig. 8. Characteristics of 4 μm laser output power. (a) Measured output 4 μm power and (b) optic-to-optic efficiency varies with incident pump power at different pressures; (c) measured 4 μm power and (d) optic-to-optic efficiency varies with coupled pump power at different pressures; (e) absorbed pump power as a function of coupled pump power; (f) measured absorbed pump power and the maximum output 4 μm laser power as a function of HBr pressures
表 1波长2 μm以上掺稀土离子连续光纤激光特性
Table1. Characteristics of rare-earth-doped CW fiber lasers with emission wavelength above 2 μm
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表 2H79Br在2 μm波段的吸收谱线和相应的4 μm波段激射波长
Table2. Absorption lines at 2 μm band and corresponding emission lines at 4 μm band of H79Br
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周智越, 李昊, 崔宇龙, 黄威, 王泽锋. 基于空芯光纤的光泵浦4 μm连续波HBr气体激光器[J]. 光学学报, 2020, 40(16): 1614001. Zhiyue Zhou, Hao Li, Yulong Cui, Wei Huang, Zefeng Wang. Optically Pumped 4 μm CW HBr Gas Laser Based on Hollow-Core Fiber[J]. Acta Optica Sinica, 2020, 40(16): 1614001.
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