Mode-locking threshold decrease in a fiber laser by heterochromic optical pulse injection

Kangwen Yang; Jiaying Li; Jiamei Wu; An Hu; Qiang Hao; Junsong Peng; Junsong Peng; Kun Huang; Kun Huang; Heping Zeng; Heping Zeng; Heping Zeng; Heping Zeng

doi:10.1364/OL.468197

Optics Letters
Vol. 47,
Issue 16,
pp. 4095-4098
(2022)
•https://doi.org/10.1364/OL.468197

Mode-locking threshold decrease in a fiber laser by heterochromic optical pulse injection

Kangwen Yang, Jiaying Li, Jiamei Wu, An Hu, Qiang Hao, Junsong Peng, Kun Huang, and Heping Zeng

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Kangwen Yang, Jiaying Li, Jiamei Wu, An Hu, Qiang Hao, Junsong Peng, Kun Huang, and Heping Zeng, "Mode-locking threshold decrease in a fiber laser by heterochromic optical pulse injection," Opt. Lett. 47, 4095-4098 (2022)

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Abstract

A Yb-doped fiber laser mode locked by a nonlinear amplifying loop mirror (NALM) with a figure-9 configuration is experimentally realized. By coupling heterochromic 1580-nm optical pulses into the circular part of the Yb-doped laser oscillator, a new injection-induced Q-switched mode-locking (Q-ML) like transition state is found for the first time to the best of our knowledge. We have investigated the envelope interval and duration of this Q-switched envelope by changing the pump power, injection power, and cavity length detuning. Experimental results have shown the injected pulses serve as a complementary source for establishing mode-locking (ML). As a result, the self-starting ML threshold of the Yb-doped fiber laser is significantly reduced from 355 to 171 mW, which is only half that in the non-injection case. This optical pulse injection assisted ML process is observed with a real-time oscilloscope, revealing stable and consistent buildup dynamics. Our finding may provide a new approach for understanding the buildup dynamics and building mode-locked fiber lasers with low threshold and high consistency.

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Supplementary Material (1)

Name	Description
Visualization 1	Laser operation from noisy pulse, Q-switched mode-locking to stable continous mode-locking by synchronous injection when reducing the cavity detuning length from 0.3 mm to 0.

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Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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