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19 November 2019 2kW, 22GHz narrow linewidth polarization maintaining fiber amplifier with near-diffraction-limited beam quality
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Abstract
In this paper, based on a linear polarized, white noise signal (WNS) phase modulated all fiber amplifier, the self-pulsing characteristics of polarization maintaining (PM) amplifier at the different phase modulation parameters with the same linewidth are analyzed experimentally. It is demonstrated that the self-pulsing threshold is closely related to the details of the modulation spectrum affected by the frequency and the signal power of the WNS, and it is near impossible to calculate by the linewidth. Besides, by suppressing the self-pulsing effect, we obtain an output of 2009 W with a linewidth of 22 GHz. The polarization extinction ratio (PER) is larger than 15 dB, and the M2 is lower than 1.2.
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Yanshan Wang, Zhe Chang, Yi Ma, Wanjing Peng, Weiwei Ke, Yinhong Sun, Rihong Zhu, and Chun Tang "2kW, 22GHz narrow linewidth polarization maintaining fiber amplifier with near-diffraction-limited beam quality", Proc. SPIE 11181, High-Power Lasers and Applications X, 111810F (19 November 2019); https://doi.org/10.1117/12.2538422
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