We numerically investigate a Raman soliton source cascaded by a fluorotellurite fiber and a chalcogenide fiber. By using a 2.8 μm fiber laser with a pulse width of 137 fs as the pump light, widely tunable Raman solitons spanning from 2.8 to 8.1μm are observed in the nonlinear media cascaded by 5 cm fluorotellurite fiber and 10 cm chalcogenide fiber. The pulse width of the red-shift soliton at 8.1 μm is 132 fs. For the first time we propose the idea of coupling the tellurite fiber and chalcogenide fiber to further enhance the SSFS effect in mid infrared region (MIR). Our simulated results show the possibility of generating long wavelength Raman soliton use a source cascaded by fluorotellurite fiber and chalcogenide fiber
A wide wavelength tunable Er3+: ZBLAN passively mode-locked fiber laser operating in the 3 μm mid-infrared region with Ti3C2Tx as a saturable absorber has been presented. The wavelength was selected by rotating the blazed grating. The fiber laser can achieve stable continuous-wave mode-locked state in the wide wavelength tuning range of 118.6 nm (2709 nm~2827.6 nm) with a repetition frequency of 28.3 MHz. When the launched pump power is 1.77 W, a stable mode-locked pulse with a maximum output power of 137.4 mW can be obtained at 2786 nm, and the corresponding single pulse energy is ~4.9 nJ. However, the pulse duration was not measured by the autocorrelator due to the limited output power. To the best of our knowledge, this is a passively mode-locked fiber laser at ~3 μm with the largest tuning range based on a saturable absorber. The presented widely wavelength tunable laser is a stable seed source for applications in laser medical treatment, spectroscopy and supercontinuum generation.
We demonstrated a three-stage cascaded Raman soliton frequency shift structure in mid-infrared region (MIR) through numerical simulation. By cascading germania-core fiber, Er3+ ZBLAN fiber amplifier with an indium fluoride or (InF3) or TeO2-Bi2O3-ZnO-Na2O (TBZN) fiber, we achieved 2-4.75 μm and 2-5.5 μm tunable range respectively. When the same tunable range was achieved, both the energy and conversion efficiency of Raman solitons in the designed three stage cascaded structure were greatly improved, comparing with structure with single Raman shifter fiber. Our work could provide an effective way to improve the energy and conversion efficiency of Raman solitons in the commonly used single Raman frequency shift structure.
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