SESAM mode-locked Yb:SrLaAlO<sub>4</sub> laser

Zeng, Hui; Zhang, Lin; Xue, Wei; Zhang, Ge; Pan, Zhongben; Lin, Haifeng; Loiko, Pavel; Mateos, Xavier; Petrov, Valentín; Wang, Li; Chen, Weidong

doi:10.1364/oe.448807

Cited by 5 publications

References 20 publications

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Kerr-lens mode-locking of an Yb:SALLO laser generating 25 fs pulses at 1090 nm

Lin,

Zeng,

Pan

et al. 2024

Applied Physics Letters

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We report on the generation of sub-30 fs pulses from a Kerr-lens mode-locked ytterbium solid-state laser based on a disordered Yb:SrLaAlO4 (Yb:SALLO) crystal as a gain medium. The Yb:SALLO laser, pumped by a spatially single-mode Yb-fiber laser at 979 nm, produces soliton pulses as short as 25 fs at 1090 nm, with an average output power of 149 mW at a pulse repetition rate of ∼80.7 MHz. The power scaling potential of the Kerr-lens mode-locked laser is exploited by achieving watt-level (1.54 W) average output power at 1081 nm for a somewhat longer pulse duration of 34 fs. This result corresponds to an impressive laser efficiency of 49.7% and a peak power of 468 kW.

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Kerr-lens mode-locking of an Yb:SALLO laser generating 25 fs pulses at 1090 nm

Lin,

Zeng,

Pan

et al. 2024

Applied Physics Letters

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Sub-50-fs Kerr-lens mode-locked Yb-doped fluoride laser with 44% optical efficiency

Su,

Wang,

et al. 2024

Appl. Opt.

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Yb-doped fluoride has been demonstrated to be potential crystals for application in efficient ultrafast lasers. However, the trade-off between the shorter pulses with higher efficiencies is a challenge. In this work, using Yb,Gd:CaSrF2 crystal, we report on a sub-50-fs Kerr-lens mode-locked oscillator with an optical efficiency up to 44%. Pumped by a 976-nm diffraction-limited fiber laser and using chirped mirrors combined with prism pairs for the dispersion compensation, a pulse as short as 46 fs was obtained with 620-mW output power, corresponding to an optical efficiency more than 40%. Stable Kerr-lens mode-locking with RMS of output power lower than 0.3% and beam quality factors M2<1.14 were achieved. Moreover, a maximum output power of 780 mW was obtained in continuous-wave operation with 55.3% optical efficiency. To the best of our knowledge, the results in this work represent the shortest pulses generated from Yb-doped fluoride lasers as well as the highest optical efficiencies ever reported in sub-100 fs Yb bulk lasers.

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