利用自成像共焦腔,开展了一维光纤激光阵列相干合成的实验研究, 实现了掺Yb双包层光纤激光阵列的相位锁定, 得到了基于一维光纤激光阵列自成像共焦腔的远场强度分布图样。根据其数学模型及理论计算,合理选择了空间滤波器宽度, 验证了空间滤波器在合成激光不同位置对不同相干成分模式所引入的损耗抑制作用,从实验上证实了空间滤波器在相干合成中 实现模式选择的机理。

The coherent combination of one-dimensional fiber laser array is studied experimentally by self-imaging confocal resonator. The phase locking output of Yb doped double-cladding fiber laser array was obtained, and the intensity distribution of the far field pattern based on one-dimensional fiber laser array by self-imaging confocal resonator was also realized. Based on the theoretical calculations of the self-imaging confocal resonator, a proper width metal wire is chosen as the spatial filter and steady interference fringes are experimentally obtained when the filter is placed at the plane of output mirror. The experiment results verify the loss functions of the spatial filter for different mode patterns with different filter place and confirm the spatial filter’s mechanism of mode selection.