We propose the design of a high-power fiber oscillator with chirped and tilted fiber Bragg gratings (CTFBGs) to suppress the stimulated Raman scattering within the fiber cavity and in the delivery fibers. A high-power single-mode fiber oscillator system was constructed for demonstration. With a CTFBG inserted into the fiber cavity, obvious Raman suppression was observed and the output signal laser power increased by ∼7%. With a CTFBG inserted between the oscillator and the delivery fibers, a maximum Raman suppression ratio of >20 dB was achieved, which implies a longer delivery distance for the same laser power level. By further improving the performance of CTFBGs, including lower inversion loss at signal wavelength, wider rejection bandwidth and deeper rejection depth, meanwhile optimizing the positions of CTFBGs, better Raman suppression could be obtained, which is significant for the further power scaling and delivery distance increasing of high-power fiber oscillators.

我们提出了一种具有chi和倾斜光纤布拉格光栅（CTFBG）的高功率光纤振荡器的设计，以抑制光纤腔内和输出光纤中受激拉曼散射。为了演示，构建了一个高功率单模光纤振荡器系统。将CTFBG插入光纤腔后，观察到明显的拉曼抑制，并且输出信号激光功率增加了约7％。通过在振荡器和传输光纤之间插入CTFBG，可以获得最大拉曼抑制比> 20 dB，这意味着在相同的激光功率水平下，传输距离更长。通过进一步改善CTFBG的性能，包括降低信号波长的反转损耗，更宽的抑制带宽和更深的抑制深度，同时优化CTFBG的位置，