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search.filters.applied.f.access: openAccess × Start date: 2020 × DDC: 530 × Subject: Pumping (laser) × Subject: Ultrafast lasers ×

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Now showing 1 - 2 of 2
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    SESAM mode-locked Tm:Y2O3 ceramic laser
    (Washington, DC : Soc., 2022) Zhang, Ning; Liu, Shande; Wang, Zhanxin; Liu, Jian; Xu, Xiaodong; Xu, Jun; Wang, Jun; Liu, Peng; Ma, Jie; Shen, Deyuan; Tang, Dingyuan; Lin, Hui; Zhang, Jian; Chen, Weidong; Zhao, Yongguang; Griebner, Uwe; Petrov, Valentin
    We demonstrate a widely tunable and passively mode-locked Tm:Y2O3 ceramic laser in-band pumped by a 1627-nm Raman fiber laser. A tuning range of 318 nm, from 1833 to 2151 nm, is obtained in the continuous-wave regime. The SESAM mode-locked laser produces Fourier-transform-limited pulses as short as 75 fs at ∼ 2.06 µm with an average output power of 0.26 W at 86.3 MHz. For longer pulse durations of 178 fs, an average power of 0.59 W is achieved with a laser efficiency of 29%. This is, to the best of our knowledge, the first mode-locked Tm:Y2O3 laser in the femtosecond regime. The spectroscopic properties and laser performance confirm that Tm:Y2O3 transparent ceramics are a promising gain material for ultrafast lasers at 2 µm.
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    Diode-pumped sub-50-fs Kerr-lens mode-locked Yb:GdYCOB laser
    (Washington, DC : Soc., 2021) Zeng, Huangjun; Lin, Haifeng; Lin, Zhanglang; Zhang, Lizhen; Lin, Zhoubin; Zhang, Ge; Petrov, Valentin; Loiko, Pavel; Mateos, Xavier; Wang, Li; Chen, Weidong
    We present a sub-50-fs diode-pumped Kerr-lens mode-locked laser employing a novel “mixed” monoclinic Yb:Ca4(Gd,Y)O(BO3)3 (Yb:GdYCOB) crystal as a gain medium. Nearly Fourier-limited pulses as short as 43 fs at 1036.7 nm are generated with an average power of 84 mW corresponding to a pulse repetition rate of ∼70.8 MHz. A higher average power of 300 mW was achieved at the expense of the pulse duration (113 fs) corresponding to an optical-to-optical efficiency of 35.8% representing a record-high value for any Yb-doped borate crystal. Non-phase-matched self-frequency doubling is observed in the mode-locked regime with pronounced strong spectral fringes which originate from two delayed green replicas of the fundamental femtosecond pulses in the time domain.