子激光器功率差对光纤激光器相干组束的影响

Influence of Power Difference of Sub-Lasers to Coherent Beam Combination of Fibre Laser

设计了由两支光纤激光器通过耦合器组成的迈克尔逊腔型光纤激光器阵列,实现了相干合成输出,相干合成功率与完全相干合成的理论值偏差约9%。研究了子激光器功率差对低损耗端口相干合成特性的影响。结果表明:当子光纤激光器功率差减小时,耦合效率增大,理论与实验偏差减小,泵浦效率增大,输出功率增大,光谱中心波长基本不变;子激光器功率越大,子激光器功率差对以上物理量的影响越小。

The Machelson type fiber laser array composed by two fiber lasers through a coupler is designed, and the coherent combination is achieved. The output power error between the experimental value and the theoretical value is about 9%. The influence of the difference of the sub-laser power to the coherent combination character of the low-loss port is studied. The experimental results indicate that as the difference of the sub fiber-laser power decreasing, the combination efficiency increases, the error between theoretical value and experimental value decreases, the pumping efficiency increases, the output power also increases. But the center wavelength of the spectrum almost stays still. The greater the sub-laser power is, the less effects of the differences of the sub-laser power on above parameters are.