In this work, we demonstrated a numerical model of 3.5 μm mid-infrared Er3+-doped ZBLAN fiber laser based on 655 nm and 1981 nm dual-wavelength pump(DWP) for the first time. Comparisons between simulation and experimental results are presented. And we optimize parameters such as fiber length, output coupler reflectivity and pumping method of two DWP schemes. Selecting the same 1981nm pump power, the output of parallel DWP scheme is larger under their respective optimal conditions.
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.
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