Parameter optimization of Gaussian unstable resonators for high-brightness laser output
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摘要:
为提升LD侧面泵浦固体金宝搏188软件怎么用 器的光束质量，实现高功率、高光束质量金宝搏188软件怎么用 输出，研究了高斯镜非稳腔金宝搏188软件怎么用 器。采用边界有限元法分析了谐振腔腔长、高斯镜膜斑半径及曲率半径参数变化对于高阶模的抑制效果；利用模式损耗差泛函理论分析了高斯镜膜斑半径模式匹配范围及最优参数区间；通过建立输出功率模型，讨论了补偿损耗功率的最佳中心透过率理论值。基于理论仿真结果对金宝搏188软件怎么用 器结构参数进行优化，分别测量了在不同高斯输出镜下输出光束的模式分布及光束质量。在谐振腔长为400 mm、泵浦电流为7.3 A、重复频率为100 Hz的实验条件下，采用膜斑半径为3 mm、曲率半径为1.5 m、中心透过率为17%的高斯输出镜，获得光束质量
M x 2=2.09、M y 2=2.20的1064 nm高光束质量金宝搏188软件怎么用 输出。-
关键词:
- 固体金宝搏188软件怎么用 器 /
- 非稳腔 /
- 模式分布 /
- 光束质量 /
- 透过率
Abstract:To achieve high-power and high-beam-quality laser output from a laser-diode side-pumped solid-state laser, this study investigates an unstable resonator incorporating a Gaussian output mirror. The boundary finite element method was utilized to analyze the effects of the resonant cavity length, Gaussian mirror membrane spot radius, and curvature radius on high-order mode suppression. The functional theory of mode loss difference was applied to determine the mode-matching range and the optimal parameters for the spot radius. Furthermore, an output power model was established to derive the theoretical optimal central transmittance for compensating loss. Based on the theoretical and simulation results, the resonator parameters were optimized, and the output beam’s mode distribution and quality were experimentally characterized using different Gaussian mirrors. Under the operational conditions of a 400 mm resonator length, 7.3 A pump current, and 100 Hz repetition frequency, the implementation of a Gaussian mirror with a 3 mm spot radius, 1.5 m curvature radius, and 17% central transmittance produced a high-quality
1064 nm laser output with beam quality factors ofM x 2=2.09 andM y 2=2.20.-
Key words:
- solid-state laser /
- unstable resonator /
- mode distribution /
- beam quality /
- transmittance
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图 1 平凸高斯非稳腔计算示意图
Figure 1. Schematic diagram of the plano-convex Gaussian unstable cavity
图 2 不同腔长下输出光束模式分布
Figure 2. Mode distributions of output beam at different resonant cavity lengths
图 3 不同腔长下输出光束光场分布
Figure 3. Optical field distributions of output beam at different resonant cavity lengths
图 4 不同膜斑半径下输出光束光斑及模式分布
Figure 4. Light spot and mode dstributions of output beam at different membrane spot radius
图 5 不同曲率半径下输出光束模式分布
Figure 5. Mode distributions of output beam at different curvature radius
图 8 不同高斯镜最佳透过率分布
Figure 8. Optimal transmittance distributions of different Gaussian mirrors
图 10 不同输出镜光斑分布
Figure 10. Light spot dstributions of different output coupling mirrors
图 12 水平和垂直轴线三限幅匹配度
Figure 12. Three-limit matching along the horizontal and vertical axes
图 13 不同输出镜光束质量因子对比
Figure 13. Comparison of beam quality factors for different output coupling mirrors
图 14
${M_{{\text{12}}}}$ 最佳光束质量因子Figure 14. Optimal beam quality factor of
${M_{{\text{12}}}}$ 
图 15
${M_{{\text{13}}}}$ 最佳光束质量因子Figure 15. Optimal beam quality factor of
${M_{{\text{13}}}}$ 
图 16 不同重复频率下不同输出镜输出能量波动
Figure 16. Output energy fluctuations of different output coupling mirrors at different repetition frequencies
表 1 输出耦合镜
${M_{1i}}$ 相关参数Table 1. Parameters of the output coupling mirror
${M_{1i}}$ Parameter ${M_{{\text{11}}}}$ ${M_{{\text{12}}}}$ ${M_{{\text{13}}}}$ ${T_{\text{0}}}$ 16% 17% 18% ${w_m}$ 5 mm 3 mm 4.5 mm $R$ $\infty $ 1.5 m 2 m 
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