Gigahertz Harmonic Mode-Locked Fiber Laser Based on Tunable SMS Ultrafast Optical Switch |
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Authors: | Tiebin Wang Liang Jin Hongwei Zhang Wei Pan He Zhang Yingtian Xu Linlin Shi Yan Li Yonggang Zou Xiaohui Ma |
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Affiliation: | National Key Laboratory on High-Power Semiconductor Lasers, Changchun University of Science and Technology, Changchun, 130022 China |
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Abstract: | A novel passively gigahertz harmonic mode-locked all-fiber laser based on hybrid fiber structure (single-mode fiber–graded-index multimode fiber–single-mode fiber (SMS)) is proposed SMS, which coils on the paddles of polarization controller (PC), is demonstrated to modulate the temporal intensity for mode-locking. The nonlinear absorption properties of the optical switch are controllable by adjusting the paddles of PC; such an ultrafast optical switch enables the wavelength switchable harmonic mode-locking operation. Ultrafast pulses with 1.9 ps at 1558.41 nm and 0.95 ps at 1563.08 nm are generated. The maximum repetition rate of the laser up to 1.127 GHz harmonic of fundamental repetition mode-locking at 1563.08 nm, corresponding to 880 order, and the output power is 4.2 mW. Considering its superiority in terms of low cost, easy integration, and high reliability, the findings validate that SMS can be used in harmonic mode-locking. |
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Keywords: | fiber lasers harmonic mode-locking optical switches ultrafast optics wavelength tunable systems |
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