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400 mW narrow linewidth single-frequency fiber ring cavity laser in 2 um waveband

Optics Express, ISSN: 1094-4087, Vol: 27, Issue: 11, Page: 15794-15799
2019
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Article Description

We present a single-frequency thulium-doped fiber laser (TDFL) with a narrow linewidth of 20 kHz. Stable single-longitudinal-mode (SLM) lasing operation at 1957 nm is achieved using a segment of un-pumped polarization-maintaining thulium-doped fiber (PMTDF) as an ultra-narrow bandwidth filter. A high optical signal-to-noise ratio (OSNR) of over 60 dB is obtained and a high power of over 400 mW is achieved with a high slope-efficiency (∼45.8%) thulium-doped fiber amplifier (TDFA).

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