论文标题
基于非线性多模式干扰的杂交超快激光器中的强大模式锁定
Robust mode-locking in a hybrid ultrafast laser based on nonlinear multimodal interference
论文作者
论文摘要
我们在实验上证明了半极化维护（半-PM）光纤激光器的实现，其中通过反射性多模式交流可饱和吸收器（SA）提供了模式锁定。在特殊设计的SA中，线性极化的光通过PM纤维耦合到15厘米长的分级多模纤维（GIMF）中，然后通过用单模光纤（SMF）靠镜子涂上镜子，然后反射回到PM结构。调制深度和饱和峰值功率分别为1.5％和0.6 W。所提出的SA设备被纳入新型的半PM Erbium掺杂纤维振荡器中，该振荡器以33.3 MHz的重复速率生成具有409 FS时间持续时间的孤子脉冲。将所提出的纤维激光器与传统的非PM光纤激光器模式进行了比较，该模式通过非线性极化演化（NPE）锁定，以光谱带宽，脉冲持续时间和稳定性性能等光学性质。在此设置中，短期和长期稳定性测试和出色的噪声性能证实了鲁棒模式锁定。
We experimentally demonstrate the realization of a half-polarization-maintaining (half-PM) fiber laser, in which mode-locking is provided by a reflective multimode-interference saturable absorber (SA). In the specially designed SA, linearly polarized light is coupled into a 15-cm-long graded-index multimode fiber (GIMF) through the PM fiber, and then reflected back to the PM structure through a mirror pigtailed with a single-mode fiber (SMF). The modulation depth and saturation peak power are measured to be 1.5% and 0.6 W, respectively. The proposed SA device is incorporated into a novel half-PM erbium-doped fiber oscillator, which generates soliton pulses with 409 fs temporal duration at a 33.3 MHz repetition rate. The proposed fiber laser is compared with a conventional non-PM fiber laser mode-locked by nonlinear polarization evolution (NPE) in terms of optical properties such as spectral bandwidth, pulse duration, and stability performance. Short- and long-time stability tests and superior noise performance corroborate robust mode-locking in this setup.
