Research of external cavity feedback for spectral beam combining of fiber lasers
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摘要: 为了解决光纤激光器外腔光谱组束中存在像差以及发光单元反馈不足等问题，采用将组束系统中单个传输透镜准直和聚焦功能分离的方法，搭建了光纤激光外腔反馈系统，实现了激光波长的锁定。结果表明，该系统光光转换效率为91.5%，反馈输出线宽为0.16nm，输出功率为29.7W，组束方向M2=1.241，非组束方向M2=1.171，实验结果同理论分析相符。该外腔反馈方案可以应用于光纤激光器光谱组束。Abstract: In order to solve the problems, such as aberration in spectrum beam combining (SBC) of external cavity of fiber lasers and insufficient feedback of light emitting units, separating the collimation and focusing function of a single transmission lens in a beam combining system instead of multiple lenses, an external cavity feedback system for an optical fiber laser was set up. Laser wavelength was locked. Through theoretical analysis and experimental verification, the result shows that, optical-optical efficiency is 91.5%, output line width of feedback is 0.16nm, output power is 29.7W, M2 in beam combining direction is 1.241, and M2 of non beam combining direction is 1.171. Experimental results are in agreement with theoretical analysis. The external cavity feedback scheme can be applied to spectrum beam combining of fiber lasers.
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Keywords:
- lasers /
- fiber laser /
- external cavity feedback /
- spectral beam combining
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Figure 7. Light field distribution
a-external cavity feedback laser after grating b-SBC after grating c-external cavity feedback laser after partially reflecting flat mirror d-SBC after partially reflecting flat mirror
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Figure 9. Relationship of SBC output power, free drive laser power, combination efficiency and current
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