Ultrafast 3.5 {\mu}m fiber laser
Nathaniel Bawden, Ori Henderson-Sapir, Stuart D. Jackson, David J., Ottaway
TL;DR
This paper presents the first femtosecond mode-locked fiber laser operating beyond 3 micrometers, achieving ultrashort pulses at 3.5 μm with high peak power using innovative pumping and polarization techniques.
Contribution
It introduces a novel 3.5 μm fiber laser that is the first to operate in the femtosecond regime beyond 3 μm, utilizing dual-wavelength pumping and non-linear polarization rotation.
Findings
Pulse duration of 580 fs
Repetition rate of 68 MHz
Peak power of 5.5 kW
Abstract
We report the first mode-locked fiber laser to operate in the femtosecond regime well beyond 3 {\mu}m. The laser uses dual-wavelength pumping and non-linear polarisation rotation to produce 3.5 {\mu}m wavelength pulses with minimum duration of 580 fs at a repetition rate of 68 MHz. The pulse energy is 3.2 nJ, corresponding to a peak power of 5.5 kW.
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