High efficient single-end operation Tm-doped silica fiber laser based on intracore FBGs
✍ Scribed by Y. Zhang; Y. Tian; Ch. Song; W. Wang; B. Yao; Y. Wang
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 81 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1612-2011
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✦ Synopsis
A LD-clad-pumped single-end operation Tm-doped silica fiber laser was reported. The output center wavelength was located at nearly 1.96 μm, and the maximal output power was 2.41 W with a 7.2 W threshold and 37.7% slope efficiency respected to the launched pump power. The laser cavity was made up only by the multi-mode FBGs, which was directly written into the 25/250 μm double-clad Tm-doped multi-mode fiber core using an 800 nm femtosecond laser and a phase mask. There was no output coupler at the other fiber end, which was angle-polished (40.4 • ) to suppress the fiber end Fresnel reflection. The output power characteristics were investigated with variable anglepolished fiber end as output coupler, such as: 0 • , 5.4 • , 25.5 • , and 40.4 • . With the increasing of fiber end polished angle, the fiber laser output slope efficiency almost held invariable, and the fiber laser only had a increasing of threshold. The output laser spectrum had no change at different polished angles.
Output laser power, W 3 4 2 1 0 14 12 10 8 6 4
Launched pump power at fiber end B, W the slope efficiency 42.7% at angle 0°t he slope efficiency 41.6% at angle 5.4°t he slope efficiency 40.4% at angle 25.5°t he slope efficiency 37.7% at angle 40.4°T he single-end operation fiber laser output power characteristics with four different angle-polished fiber ends