Opt Lett. 2019 Jan 1;44(1):122-125. doi: 10.1364/OL.44.000122.
We report on a stable single-frequency gain-switched ytterbium-doped fiber (YDF) laser at 1017 nm based on saturable absorber (SA) properties. The laser is realized by utilizing a short-length, high-concentration phosphosilicate YDF that simultaneously acts as an SA and a gain medium in a linear cavity. Despite the fact that gain switching is achieved by modulating the pump laser, single-frequency operation is sustained due to dynamic self-induced grating. By making use of high-concentration phosphosilicate YDF and selecting a suitable spectral region, grating is strongly induced along the cavity to stabilize single-mode operation. Additionally, the residual grating property in SA assures single-mode gain-switched performance at high repetition rates. Here, the laser generates pulses with 427 ns duration at 100 kHz, yielding the mean power of 12 mW with linewidth of less than 7.5 MHz.
我们报告了一种基于饱和吸收体 (SA) 特性的 1017nm 稳定单频增益开关掺镱光纤 (YDF) 激光器。该激光器通过利用短长度、高浓度磷硅 YDF 来实现，该 YDF 同时充当线性腔中的 SA 和增益介质。尽管通过调制泵浦激光来实现增益开关，但由于动态自感应光栅，仍能维持单频操作。通过使用高浓度磷硅 YDF 和选择合适的光谱区域，光栅沿腔强烈诱导以稳定单模操作。此外，SA 中的残留光栅特性确保了在高重复率下的单模增益开关性能。这里，激光器在 100kHz 下产生 427ns 脉冲，在线宽小于 7.5MHz 的情况下产生 12mW 的平均功率。
