Abstract
Recent interest in the application of mid-infrared (mid-IR) lasers has made the generation of ~3 µm ultrafast pulses a hot topic. Recently, the generation of femtosecond-scale pulses in Er3+-doped fluoride fiber lasers has been realized by nonlinear polarization rotation (NPR). However, a numerical study on these fiber lasers has not been reported yet. In this work, the output properties of the NPR passively mode-locked Er3+-doped fluoride fiber ring laser in ~3 µm have been numerically investigated based on the coupled Ginzburg–Landu equation. The simulation results indicate that stable uniform solitons (0.75 nJ) with the pulse duration of femtosecond-scale can be generated from this fiber laser. This numerical investigation can provide some reference for developing the high energy femtosecond soliton fiber lasers in the mid-IR.
Highlights
Due to the potential applications in the defense, laser microsurgery, mid-infrared spectroscopy, and the pump source for longer wavelength mid-infrared or far-infrared oscillators, ultrafast pulse lasers operating in ~3 μm mid-IR wavelength band have been focused on more and more by researchers [1,2,3]
Er 3+ -doped fluoride fiber ring laser in mid-IR near 3 μm that passively mode-locked by nonlinear polarization rotation (NPR)
Er -doped fluoride fiber ring laser in mid-IR near 3 μm that passively mode-locked by NPR
Summary
Due to the potential applications in the defense, laser microsurgery, mid-infrared spectroscopy, and the pump source for longer wavelength mid-infrared or far-infrared oscillators, ultrafast pulse lasers operating in ~3 μm mid-IR wavelength band have been focused on more and more by researchers [1,2,3]. The reported pulse durations for the 2D material SAs-based mode-locking in. Photonics 2019, 6, 25 material SAs-based mode-locking in Er3+-doped fluoride fiber laser were limited to be picosecond scale due to the low modulation depth of the material SAs in mid-IR [9,14,15]. As an artificial saturable absorber, NPR technology shows the advantages of fast. NPR technology showsdamage the advantages of fast response time, higher damage andoperation, long-term response time, higher threshold, and long-term stability at high threshold, pulse energy stability at high pulse energy operation, which has been considered to be one of the most attractive which has been considered to be one of the most attractive approaches to achieve the stable high approaches to achieve the stable high energy ultrafast pulse laser. Er enables the generation of stable uniform solitons up to 0.75 nJ with the pulse duration of ~500 fs
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