Passively mode-locked and Q-switched fiber laser utilizing a same tungsten oxide (WO3) film as absorbers

Xin Tan; Ya Liu; Yongkang Zheng; Zewu Xie; Jie Yang

doi:10.1117/12.2602761

9 October 2021 Passively mode-locked and Q-switched fiber laser utilizing a same tungsten oxide (WO₃) film as absorbers

Xin Tan, Ya Liu, Yongkang Zheng, Zewu Xie, Jie Yang

Proceedings Volume 11905, Quantum and Nonlinear Optics VIII; 119051H (2021) https://doi.org/10.1117/12.2602761
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

We demonstrate a passively mode-locked and a passively Q-switched erbium-doped fiber laser respectively by utilizing a same saturable absorber fabricated with tungsten trioxide (WO₃). When the WO₃ saturable absorber is employed to provide the pulse narrowing effect, Q-switched pulses were observed with a repetition rate of 44.11 kHz and a pulse width of 3.42 μs. Moreover, the Q-switched laser could realize hybrid mode-locking after an in-line polarizer was inserted, which could introduce an additional pulse narrowing effect of nonlinear polarization rotation under a certain polarization state. The 3- dB spectral bandwidth and the repetition rate of mode-locked pulses are about 7.5 nm and 22.51 MHz respectively. The pulse train is stable with a signal to noise ratio of 70 dB.

Citation Download Citation

Xin Tan, Ya Liu, Yongkang Zheng, Zewu Xie, and Jie Yang "Passively mode-locked and Q-switched fiber laser utilizing a same tungsten oxide (WO₃) film as absorbers", Proc. SPIE 11905, Quantum and Nonlinear Optics VIII, 119051H (9 October 2021); https://doi.org/10.1117/12.2602761

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