3 kW Near-Single-Mode All-Fiber Amplifier Based on 20/400 μm Gain Fiber and Its Long Time Operation Characteristics

罗雪雪,; 奚小明,; 史尘,; 王小林,; 张汉伟,; 陶汝茂,; 韩凯,; 周朴,; 许晓军,

doi:10.3788/cjl201946.0201004

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“…Recently the output powers of 5kW with output beam quality M 2 =1.6 and 6kW with M 2 =2.0 have been reached in narrow-linewidth Yb fiber amplifier in all-fiber format configuration with bi-directional tandem pumping [3]. The output powers achieved in all-fiber format amplifiers with direct diode pumping are 3kW with output beam quality M 2 =1.7 [4], 3kW with M 2 <1.1 [5] and 4kW with M 2 =1.33 [6]. The maximum output powers of narrow-linewidth fiber amplifiers are limited mainly by non-linear Stimulated Brillouin Scattering (SBS), Stimulated Raman Scattering (SRS) and Mode Instability (MI) effects [7][8][9][10][11][12][13].…”

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confidence: 99%

4kW single-mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package

Platonov¹,

Yagodkin²,

Cruz³

et al. 2023

Fiber Lasers XX: Technology and Systems

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We report 4kW Single-Mode narrow-linewidth Ytterbium fiber amplifier in all-fiber format and modular package with diffraction-limited beam divergence for the amplification of narrow linewidth seed signals. Measured M 2 values of output beam throughout full power range are ≤ 1.1. The fiber amplifier has been pumped by laser diodes directly and has 3m output delivery cable terminated with IPG connector. The amplifier module has ≥ 38% electro-optical efficiency. The fiber amplifier operates up to 4kW with depolarized seed signals without onset of SBS and/or MI. We observed the broadening of amplified signal at high powers when depolarizing of the narrow-linewidth seed signal was produced with a classic Lyot scheme on PM Panda fibers. This broadening resulted in dropping of in-band power below 99% at output powers >3.3kW. Negligible broadening at FWHM level of amplified signal have been observed with other type of fiber depolarizer based on single PM Panda fiber scheme. The Yb fiber amplifier with this type of depolarizing of seed signal operates up to 4kW with in-band power ≥ 99% at 60GHz linewidth of the seed source.

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