All-fiber short-wavelength tunable mode-locked fiber laser using normal dispersion thulium-doped fiber

Optics Express
Shaoxiang ChenSeongwoo Yoo

Abstract

We report an all-fiber high pulse energy ultrafast laser and amplifier operating at the short wavelength side of the thulium (Tm) emission band. An in-house W-type normal dispersion Tm-doped fiber (NDTDF) exhibits a bending-induced distributed short-pass filtering effect that efficiently suppresses the otherwise dominant long wavelength emission. By changing the bending diameter of the fiber, we demonstrated a tunable mode-locked Tm-doped fiber laser with a very wide tunable range of 152 nm spanning from 1740 nm to 1892 nm. Pulses at a central wavelength of 1755 nm were able to be amplified in an all-fiber configuration using the W-type NDTDF, without the use of any artificial short-pass filter or pulse stretcher. The all-fiber amplifier delivers 2.76 ps pulses with an energy of ∼32.7 nJ without pulse break-up, due to the normal dispersion nature of the gain fiber, which marks so far, the highest energy amongst fiber lasers in the 1700 nm-1800 nm region.

References

Oct 31, 2006·Optics Letters·Matteo ForoniStefano Selleri
Jan 9, 2006·Optics Express·Søren Dyøe Agger, Jorn Hedegaard Povlsen
Jan 15, 2014·Nature Photonics·C Xu, F W Wise
Sep 9, 2015·Scientific Reports·Chongyuan HuangJianqiu Xu
Apr 22, 2016·Scientific Reports·Teppo NoronenOleg G Okhotnikov
Apr 26, 2017·Optics Express·Biao SunXia Yu
Oct 8, 2017·Scientific Reports·Siamak Dawazdah EmamiHairul Azhar Abdul Rashid
Mar 1, 2018·Optics Letters·Aleksandr KhegaiEvgeny Dianov
Sep 11, 2019·Optics Express·Masaki TokurakawaHenrik Tünnermann
Dec 25, 2019·Optics Express·Shaoxiang ChenJae M O Daniel

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