De Yuan Shen

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Polarization resolved study on the operation of a quasi-isotropic cavity erbium-doped fiber laser revealed a novel form of periodic fast polarization switching between the two orthogonal linearly polarized eigen-modes of the laser. We show both experimentally and theoretically that the operation of the laser is a result of the polarization domain formation,(More)
Polarization rotation vector solitons formed in a fiber laser passively mode locked with atomic layer graphene were experimentally investigated. It was found that different from the case of the polarization locked vector soliton formed in the laser, two extra sets of spectral sidebands always appear on the soliton spectrum of the polarization rotating(More)
We experimentally investigated the vector multi-soliton operation and vector soliton interaction in an erbium doped fiber laser passively mode locked by atomic layer graphene. It is found that the vector multi-soliton operation exhibited several characteristic modes. These are the random static distribution of vector solitons, stable bunches of vector(More)
We report numerical simulations on the high-order group-velocity-locked vector soliton (GVLVS) generation based on the fundamental GVLVS. The high-order GVLVS generated is characterized with a two-humped pulse along one polarization and a single-humped pulse along the orthogonal polarization. The phase difference between the two humps could be 180°(More)
We report experimental observations and numerical simulation results on the spectrum moving, narrowing, broadening, and wavelength switching of dissipative solitons (DSs) in an all-normal-dispersion Yb-fiber laser that is passively mode-locked by using the nonlinear polarization rotation (NPR) technique. We found numerically that the DS spectrum moving,(More)
We report an L-band passively mode-locked erbium-doped fiber ring laser using the nonlinear polarization rotation technique. The center wavelength of the fiber laser can be tuned from 1575.5 to 1603.6 nm. The 458.7-fs pulses at 1603.6 nm show an 8.6-MHz pulse repetition rate. To the best of our knowledge, it is the longest wavelength for which subpicosecond(More)
Gold nanorods (GNRs) with surface plasmon resonance peak at 1063.8 nm were fabricated and experimentally exploited as the single and combined saturable absorber (SA) in a Q-switched Nd:YAG laser for the first time. In the situation using GNRs as a single SA, the maximum pulse energy of 19 μJ was achieved at a pulse repetition rate of 20 kHz. However,(More)
We report on a high-peak-power acousto-optically Q-switched Er:Y<sub>2</sub>O<sub>3</sub> ceramic laser operating at room temperature. Stable pulses with a duration of 41&#x2013;190 ns (FWHM) are generated at approximately 2.7 &#x03BC;m with the repetition rate varying from 0.3 to 10 kHz. The peak power at 0.3-kHz repetition rate is approximately 7.3 kW. An(More)