Opt Express. 2023 Mar 13;31(6):10617-10624. doi: 10.1364/OE.486577.
We report on the first sub-60 fs pulse generated from a diode-pumped SESAM mode-locked Yb-laser based on a non-centrosymmetric Yb:YAl(BO) crystal as a gain medium. In the continuous-wave regime, pumping with a spatially single-mode, fiber-coupled 976 nm InGaAs laser diode, the Yb:YAl(BO) laser generated 391 mW at 1041.7 nm with a slope efficiency as high as 65.1%, and a wavelength tuning across 59 nm (1019 to 1078 nm) was achieved. By implementing a commercial SESAM to initiate and sustain the soliton type mode-locking, and using only a 1 mm-thick laser crystal, the Yb:YAl(BO) laser delivered pulses as short as 56 fs at a central wavelength of 1044.6 nm with an average output power of 76 mW at a pulse repetition rate of ∼67.55 MHz. To the best of our knowledge, this result represents the shortest pulses ever achieved from Yb:YAB crystal.
我们报告了首例基于非中心对称 Yb:YAl(BO)晶体作为增益介质的二极管泵浦 SESAM 锁模 Yb 激光器产生的亚 60fs 脉冲。在连续波模式下，用空间单模光纤耦合 976nm InGaAs 激光二极管进行泵浦，Yb:YAl(BO)激光器在 1041.7nm 处产生 391mW 的功率，斜率效率高达 65.1%，波长调谐范围为 59nm（1019nm 到 1078nm）。通过采用商用 SESAM 来启动和维持孤子型锁模，并且仅使用 1mm 厚的激光晶体，Yb:YAl(BO)激光器在中心波长为 1044.6nm 时输出最短的 56fs 脉冲，平均输出功率为 76mW，脉冲重复率约为 67.55MHz。据我们所知，这一结果代表了迄今为止从 Yb:YAB 晶体获得的最短脉冲。
