Tunable Mid-Infrared Raman Soliton Generation From 2.80 to 3.17 μm Based on Fluorotellurite Fiber

Tunable mid-infrared Raman soliton generation from 2.80 to 3.17
$\mu \text{m}$
based on fluorotellurite fiber is presented. The seed is a femtosecond mode-locked Er3+-doped ZBLAN fiber oscillator at 2.8
$\mu \text{m}$
. Feeding the pulses to an Er3+-doped ZBLAN fiber amplifier, the pulse average power can be boosted to 773 mW with the self-compressed width of 100 fs (estimated). Subsequently, launching the amplified pulses into an in-house high-nonlinearity fluorotellurite fiber, the pulses can be mostly red-shifted to 3.17
$\mu \text{m}$
with a conversion efficiency of 26% and an average power of 39 mW. The experimental results indicate that fluorotellurite fibers are superior nonlinear media for generation of tunable mid-infrared ultrashort pulses.