Single-frequency linearly polarized Q-switched fiber laser based on Nb2GeTe4 saturable absorber

doi:10.1088/1674-1056/acad6d

Abstract We report a single-frequency linearly polarized Q-switched fiber laser based on an Nb₂GeTe₄ saturable absorber (SA). The Nb₂GeTe₄ SA triggers passive Q-switching of the laser, and an un-pumped Yb-doped fiber together with a 0.08-nm-bandwidth polarization-maintaining fiber Bragg grating (FBG) acts as an ultra-narrow bandwidth filter to realize single-longitudinal-mode (SLM) oscillation. The devices used in the laser are all kept polarized, so as to ensure linearly polarized laser output. Stable SLM linearly polarized Q-switching operation at 1064.6 nm is successfully achieved, producing a laser with a shortest pulse width of 1.36 μ s, a linewidth of 28.4 MHz, a repetition rate of 28.3 kHz-95.9 kHz, and a polarization extinction ratio of about 30 dB. It is believed that the single-frequency linearly polarized pulsed fiber laser studied in this paper has great application value in gravitational wave detection, beam combining, nonlinear frequency conversion, and other fields.

Keywords: fiber laser saturable absorber single-longitudinal-mode pulsed laser

Received: 16 November 2022
Revised: 09 December 2022
Accepted manuscript online: 21 December 2022

PACS:	42.55.-f	(Lasers)
	42.55.Wd	(Fiber lasers)
	42.60.Gd	(Q-switching)
	42.65.Pc	(Optical bistability, multistability, and switching, including local field effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62275272) and the Training Program for Excellent Young Innovators of Changsha, China (Grant No. KQ2206003).

Corresponding Authors: Rong-Tao Su, Jian Wu
E-mail: surongtao@126.com;wujian15203@163.com

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Si-Yu Chen(陈思雨), Hai-Qin Deng(邓海芹), Wan-Ru Zhang(张万儒), Yong-Ping Dai(戴永平), Tao Wang(王涛), Qiang Yu(俞强), Can Li(李灿), Man Jiang(姜曼), Rong-Tao Su(粟荣涛), Jian Wu(吴坚), and Pu Zhou(周朴) Single-frequency linearly polarized Q-switched fiber laser based on Nb₂GeTe₄ saturable absorber 2023 Chin. Phys. B 32 074203

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Single-frequency linearly polarized Q-switched fiber laser based on Nb2GeTe4 saturable absorber

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Single-frequency linearly polarized Q-switched fiber laser based on Nb₂GeTe₄ saturable absorber