Femtosecond mode-locked holmium fiber laser pumped by semiconductor disk laser

Abstract

We report on a 2085 nm holmium-doped silica fiber laser passively mode-locked by semiconductor saturable absorber mirror and carbon nanotube absorber. The laser, pumped by a 1.16 μm semiconductor disk laser, produces 890 femtosecond pulses with the average power of 46 mW and the repetition rate of 15.7 MHz.

All-PM coherent 205 µm Thulium/Holmium fiber frequency comb source at 100 MHz with up to 05 W average power and pulse duration down to 135 fs

“…Central wavelengths above 2 µm have been demonstrated by use of a Thulium based frontend laser for subsequent Raman soliton generation [5]. 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].…”

A review of recent progress in holmium-doped silica fibre sources

“…This gain bandwidth is significantly larger than that present in most holmium-doped crystalline materials and as a result, holmium-doped fibres are able to support significantly shorter pulses. Recently holmium based fs-sources utilising SESAM and carbon nano-tube saturable absorbers have been demonstrated [54]. Operation in the fs-regime is expected to mitigate the occurrence of MI, as the pulse duration will be shorter than the build-up time associated with this non-linear process.…”

Low noise, tunable Ho:fiber soliton oscillator for Ho:YLF amplifier seeding

“…The transition between the 5 I 7 and 5 I 8 manifolds exhibits a large emission cross-section and a gain bandwidth suitable for the amplification of fs-pulses, which allows the direct generation of pulse-trains within the amplifer gain spectrum with variable parameters. However, most previously demonstrated Ho:fiber and solid state oscillators did not meet the spectral requirements for subsequent amplification [24][25][26].…”