Agger Søren, Povlsen Jørn Hedegaard, Varming Poul
Research Center COM-Technical University of Denmark-DTU, H. C. Oersteds Plads 345w2, 2800 Kongens Lyngby, Denmark.
Opt Lett. 2004 Jul 1;29(13):1503-5. doi: 10.1364/ol.29.001503.
We have successfully demonstrated a single-frequency distributed-feedback (DFB) thulium-doped silica fiber laser emitting at a wavelength of 1735 nm. The laser cavity is less than 5 cm long and is formed by intracore UV-written Bragg gratings with a phase shift. The laser is pumped at 790 nm from a Ti:sapphire laser and has a threshold pump power of 59 mW. The laser has a maximum output power of 1 mW in a single-frequency, single-polarization radiation mode and is tunable over a few nanometers. To the best of the authors' knowledge, this is the first report of a single-frequency DFB fiber laser that uses thulium as the amplifying medium. The lasing wavelength is the longest demonstrated with DFB fiber lasers and yet is among the shortest obtained for thulium-doped silica fiber lasers.
我们成功展示了一种单频分布反馈（DFB）掺铥石英光纤激光器，其发射波长为1735 nm。激光腔长度小于5 cm，由具有相移的芯内紫外写入布拉格光栅构成。该激光器由钛宝石激光器在790 nm波长处泵浦，阈值泵浦功率为59 mW。该激光器在单频、单偏振辐射模式下的最大输出功率为1 mW，并且在几纳米范围内可调谐。据作者所知，这是首次报道使用铥作为放大介质的单频DFB光纤激光器。该激光波长是DFB光纤激光器中展示出的最长波长，但却是掺铥石英光纤激光器中获得的最短波长之一。
