Journal
OPTICS LETTERS
Volume 39, Issue 7, Pages 2052-2055Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.002052
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Fonds de recherche du Quebec-Nature et technologies (FRQ.NT)
- Canada Excellence Research Chairs (CERC)
- CorActive Hightech inc.
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Laser emission is demonstrated at a wavelength of 3.766 mu m in a cascaded Raman gain device. The laser cavity is made of two nested pairs of fiber Bragg gratings inscribed in a 2.8 m length of low-loss As2S3 fiber. An erbium-doped fluoride glass quasi-CW fiber laser emitting at 3.005 mu m is used to pump the cascaded Raman cavity, which converts the pump wavelength successively to the first and second Stokes orders, respectively at 3.340 and 3.766 mu m. A laser output peak power in excess of 100 mW is obtained with a lasing efficiency of about 8.3% with respect to the launched pump power. This represents the highest emission wavelength delivered by a fiber laser operating at room temperature. (C) 2014 Optical Society of America
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