Improvement of beam quality by pump homogenization of Innoslab laser amplifier
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摘要: 针对结构紧凑的部分端面泵浦混合腔板条激光放大器，研究了泵浦匀化对其输出激光光束质量的改善作用。基于ZEMAX仿真软件，设计并对比分析了直接成像和波导匀化后再成像两种泵浦耦合方式对激光二极管阵列慢轴（晶体宽度）方向光强分布均匀性的影响，发现波导匀化后泵浦均匀性得到明显提升且激光二极管阵列发光坏点对泵浦成像的影响得以弱化。进一步实验验证了泵浦匀化对Innoslab激光放大器性能的改善作用：波导匀化后慢轴方向泵浦均匀度从90.6%提高到95.4%，进而使3通放大后输出激光光束质量因子M2从2.41提升到1.55，并且有效抑制了多通放大腔内的自激振荡。
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关键词:
- Innoslab激光放大器 /
- 波导匀化 /
- 泵浦均匀度 /
- 光束质量 /
- 自激振荡
Abstract: The effect of pump homogenization on the beam quality of the output laser is studied for a compact partially end-pumped hybrid-cavity slab laser amplifier, i.e. Innoslab laser amplifier. Using ZEMAX simulation software, two pump coupling modes, direct imaging and homogenization with waveguide were designed, and their effects on the uniformity of light intensity distribution in the slow axis (crystal width) direction of laser diode arrays were compared. It is found that the pump uniformity is significantly improved after the waveguide is homogenized and the influence of the laser diode array luminescence dead pixels on the pump imaging is weakened. Furthermore, the effect of pumping homogenization on the performance of Innoslab laser amplifier is verified by experiments: the uniformity of slow-axis pumping increases from 90.6% to 95.4% after homogenization with waveguide, and the quality of output laser beam M2 increases from 2.41 to 1.55 after three-pass amplification, and the self-oscillation in the cavity is effectively suppressed. -
图 3 直接成像泵浦耦合二维光强分布和宽度方向分布曲线
Figure 3. Intensity distribution of the direct-imaging pump
图 4 波导匀化后再成像泵浦耦合光路结构图
Figure 4. Optical configuration of the waveguide-homogenization pump
图 5 波导匀化后再成像泵浦耦合二维光强分布和宽度方向分布曲线
Figure 5. Intensity distribution of the waveguide-homogenization pump
图 6 LD阵列巴条出现发光坏点时，宽度方向泵浦光强分布曲线
Figure 6. Intensity distribution curve of the pump in the width direction when the bars of the LD array have a point defect
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