Infrared and Laser Engineering, Volume. 51, Issue 6, 20210442(2022)
Hundred-watt-level 1 030 nm fiber-bulk hybrid amplified laser
Fiber-bulk hybrid amplification technology combines the advantages of fiber lasers and bulk amplifiers to obtain a compact and low-cost high power ultrashort pulse laser. Therefore, a high average power ultrashort pulse laser was designed based on Yb-doped fiber-bulk hybrid amplification technology. The laser was consisted of an Yb-doped all-fiber laser and two-stage bulk amplifiers. The first bulk amplifier was based on Yb: YAG single crystal fiber, and the second bulk amplifier was based on Yb: YAG rod with unpolished barrel. The all-fiber front end delivered 6.5 W average power, 52.9 MHz repetition rate and 47.5 ps pulse duration. The single crystal fiber amplifier obtained an average power of 40 W at the backward pump power of 182 W through a single-pass amplification. The Yb: YAG rod amplifier outputted an average output power of 122.9 W at the backward pump power of 307 W in single-pass configuration. After removing the depolarization part introduced by thermal effect, an average output power of 107.3 W with linear polarization state was obtained, and the corresponding slope efficiency was 26.1%. The pulse width of 12.1 ps and center wavelength of 1030.6 nm with spectral width of 2.4 nm were achieved. At the maximum output power of 107.3 W, a beam quality factor of 1.45 and 1.20 were measured along the vertical and horizontal direction, respectively.
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Yan Xu, Zhigang Peng, Yuhang Shi, Beibei Wang, Zhaochen Cheng, Pu Wang. Hundred-watt-level 1 030 nm fiber-bulk hybrid amplified laser[J]. Infrared and Laser Engineering, 2022, 51(6): 20210442
Category: Lasers & Laser optics
Received: Jul. 2, 2021
Accepted: --
Published Online: Dec. 20, 2022
The Author Email: Peng Zhigang (pzg@bjut.edu.cn)