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Multistate passively mode-locked thulium-doped fiber laser with nonlinear amplifying loop mirror

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Abstract

In this paper, a multistate passively mode-locked thulium-doped fiber laser with nonlinear amplifying loop mirror is reported. An ultra-high numerical aperture fiber is employed to compensate the cavity abnormal dispersion, and the net cavity dispersion value is fixed at 0.046ps2. By changing the pump power, three different mode-locked regions, namely Q-switched mode-locking operation, mode-locking operation, and dual-wavelength mode-locking operation, are observed sequentially. When the pump power is raised to the threshold of 1.60 W, the transition state of the Q-switched mode locking begins to be observed. When the pump power increases from 2.88 W to 8.75 W, stable single-wavelength mode-locking operation is obtained. And the center wavelength is 1988.73 nm corresponding to the 3 dB spectral bandwidth of 11.21 nm. As the pump power is raised beyond 8.75 W, dual-wavelength mode-locking operation is developed, where the dual wavelengths are 1969.70 nm and 1984.12 nm with the 3 dB spectral bandwidth of 4.11nm and 6.14nm, respectively.

© 2018 Optical Society of America

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