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Proceedings Paper

Recent progress in high-power ultrafast thulium-doped fiber lasers and mid-infrared supercontinuum sources
Author(s): Jiang Liu; Hongxing Shi; Kun Liu; Fangzhou Tan; Pu Wang
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Paper Abstract

The research on high-power ultrafast thulium-doped fiber lasers at 2 μm wavelength and mid-infrared (mid-IR) supercontinuum sources at 2~5 μm wavelength is one of these hot spots because of their potential applications in eye-safe radar, material processing, and electro-optical countermeasure system, which has an irreplaceable role compared to other wavelength fiber lasers. Here, we review the recent work of our group at 2 μm high-power ultrafast thulium-doped fiber lasers and 2~5 μm high-power mid-IR supercontinuum sources. Firstly, we demonstrate a high-power picosecond-pulsed thulium-doped all-fiber master-oscillator power-amplifier (MOPA), which yielded 120 W of average output power at central wavelength of 1963 nm with pulse duration of 16 ps. And then, we demonstrate a 203 W average power all-polarization-maintaining (all-PM) thulium-doped fiber MOPA system delivering picosecond pulses without using conventional chirped pulse amplication (CPA) technique. The pulse duration of 15 ps at 611.5 MHz repetition-rate results in a peak-power of 22 kW in the final PM thulium-doped fiber power amplifier. The polarization extinction ratio (PER) at the highest average output power was measured to be >15 dB, further power scaling is limited by available pump power. Finally, we demonstrate a high-power mid-IR supercontinuum generation with up to 21.8 W average power and spectrum spanning from 1.9 to beyond 3.8 μm in a single-mode ZBLAN fiber pumped by a 2 μm amplified picosecond pulses from a single-mode thulium-doped all-fiber MOPA.

Paper Details

Date Published: 20 May 2015
PDF: 13 pages
Proc. SPIE 9466, Laser Technology for Defense and Security XI, 946605 (20 May 2015); doi: 10.1117/12.2179244
Show Author Affiliations
Jiang Liu, Beijing Univ. of Technology (China)
Hongxing Shi, Beijing Univ. of Technology (China)
Kun Liu, Beijing Univ. of Technology (China)
Fangzhou Tan, Beijing Univ. of Technology (China)
Pu Wang, Beijing Univ. of Technology (China)

Published in SPIE Proceedings Vol. 9466:
Laser Technology for Defense and Security XI
Mark Dubinskii; Stephen G. Post, Editor(s)

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