University of Rochester, Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1299, USA.
Opt Lett. 2010 Jun 1;35(11):1828-30. doi: 10.1364/OL.35.001828.
We present, for the first time to our knowledge, an explicit experimental comparison of beam quality in conventional and confined-gain multimode fiber lasers. In the conventional fiber laser, beam quality degrades with increasing output power. In the confined-gain fiber laser, the beam quality is good and does not degrade with output power. Gain filtering of higher-order modes in 28microm diameter core fiber lasers is demonstrated with a beam quality of M(2)=1.3 at all pumping levels. Theoretical modeling is shown to agree well with experimentally observed trends.
我们首次明确地对常规光纤激光器和限制增益多模光纤激光器的光束质量进行了实验比较。在常规光纤激光器中，光束质量随着输出功率的增加而劣化。在限制增益光纤激光器中，光束质量良好且不随输出功率而劣化。在 28μm 芯径光纤激光器中，通过对高阶模的增益滤波实现了 M²=1.3 的光束质量，并且在所有泵浦水平下都能观察到这种效果。理论模型与实验观察到的趋势吻合良好。
