Abstract
We report on a dual output all-PM fiber laser system running at 100 MHz repetition rate offering coherent broadband and narrowband pulses centered at 2.05 µm with a spectral FWHM bandwidth of 60 nm and 1.5 nm at up to 360 mW and 500 mW, respectively. The broadband pulses are compressed down to 135 fs. The multi-stage double-clad amplifier based on Tm/Ho codoping is seeded by a supercontinuum light source, spanning from around 1 µm up to 2.4 µm.
Highlights
In recent time, a high interest in fiber laser systems with wavelengths beyond the 1.55 μm region, covered by Erbium-Laser devices, has developed
We report on a dual output all-polarization maintaining (PM) fiber laser system running at 100 MHz repetition rate offering coherent broadband and narrowband pulses centered at 2.05 μm with a spectral FWHM bandwidth of 60 nm and 1.5 nm at up to 360 mW and 500 mW, respectively
For the first time to our knowledge, an entirely polarization maintaining (PM) fiber based coherent light source around 2.05 μm with average powers of several hundred mW and FWHM pulse durations down to 135 fs
Summary
A high interest in fiber laser systems with wavelengths beyond the 1.55 μm region, covered by Erbium-Laser devices, has developed. By use of Holmium doping, oscillators with emission wavelengths above 2 μm and FWHM bandwidths of sub 10 nm, avoiding strong spectral absorption lines around 1.9 μm [6], have been investigated [7]. Another approach is to amplify the 2 μm region of a supercontinuum (SC) or Raman shifted seed source [8,9,10] or to generate SC in Thulium or Holmium doped fibers [11,12]. To cover a wide range of applications, the system is designed to support both broadband (BB) as well as narrowband (NB) pulses with a FWHM bandwidth of 60 nm and 1.5 nm, respectively
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