A stable and tunable PT-symmetric single-longitudinal-mode fiber laser

Liu-Yuan Tao; Fei Wang; Zheng-Mao Wu; Guang-Qiong Xia

doi:10.1117/12.2643138

28 December 2022 A stable and tunable PT-symmetric single-longitudinal-mode fiber laser

Liu-Yuan Tao, Fei Wang, Zheng-Mao Wu, Guang-Qiong Xia

Proceedings Volume 12310, Advanced Lasers, High-Power Lasers, and Applications XIII; 123100O (2022) https://doi.org/10.1117/12.2643138
Event: SPIE/COS Photonics Asia, 2022, Online Only

Abstract

We propose and experimentally demonstrate a stable and tunable PT-symmetric single-longitudinal-mode (SLM) fiber ring laser using a nonreciprocal Sagnac loop. To suppress multiple-longitudinal-mode oscillation, the Sagnac loop only including a 3-dB optical coupler (OC) and a polarization controller (PC) is incorporated into the fiber ring cavity, which induces nonreciprocal light transmission and coupling between the frequency-degenerate clockwise (CW) and counterclockwise (CCW) resonator modes. The two light paths traveling along the CW and CCW directions in the Sagnac loop are defined as the gain loop and loss loop, respectively. By adjusting the polarization states of the two light waves, when the gain and loss coefficients are larger than the coupling coefficient, the PT symmetry is broken, singlemode lasing is thus generated in the fiber laser cavity.

Conference Presentation

Citation Download Citation

Liu-Yuan Tao, Fei Wang, Zheng-Mao Wu, and Guang-Qiong Xia "A stable and tunable PT-symmetric single-longitudinal-mode fiber laser", Proc. SPIE 12310, Advanced Lasers, High-Power Lasers, and Applications XIII, 123100O (28 December 2022); https://doi.org/10.1117/12.2643138

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