Ultra-narrow linewidth Tm3+-doped fiber laser based on intra-core fiber Bragg gratings

✍ Scribed by Y.J. Zhang; W. Wang; S.F. Song; Z.G. Wang

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 89 KB
• Volume: 6
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200910064

✦ Synopsis

A 74 pm ultra-narrow linewidth diode laser (LD) claddingding-pumped Tm 3+ -doped fiber laser was reported. The maximal continuous wave (CW) output power was 14.5 W at 1946 nm, with a slope efficiency of 37.5% and the threshold of 5.3 W. The single-mode double-cladding Tm 3+ -doped fiber had a core diameter of 15 μm (NA:0.1), and the regular hexagonal inner-cladding diameter was 200 μm (NA:0.46). The high reflection coupler was based on the intra-core fiber Bragg gratings (FBGs), which were directly written into the Tm 3+ -doped non-photosensitive fiber core by the 800 nm femtosecond laser and a phase mask. The output coupler was the other fiber end with 3.6% Fresnel reflection, and the pump source was a high power 792 nm LD with a 200 μm pigtail fiber output. According to our knowledge, this was the first report on the ultra-narrow linewidth Tm 3+ -doped fiber laser using intra-core FBGs approximately 2 μm. Beam radius, mm 0.8 0.6 0.4 0.2 0 1.0 1.