18 November 2014 All-fiber designed narrow line-width 1.55μm double cladding fiber lasers
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To develop 1.55μm high power lasers with compactness, narrow spectral line-width and high wavelength stability suitable for practical applications, EY-DCFLs built in all-fiber configuration are investigated. The experimental setups are composed of Er3+/Yb3+ co-doped double-clad gain fiber, multimode 976nm pump laser diode, double-clad fiber Bragg gratings (FBGs) and (1+1)x1 side pump couplers. FBGs with different reflectivity are applied as output reflectors, and forward-pump scheme and backward-pump scheme are performed respectively. As the efficiency and the spectral stability are considered simultaneously, EY-DCFL with low reflective FBG mirror and in backward-pump manner is more desirable. In the optimized all-fiber EY-DCFL, the maximum output power with an optical-optical efficiency of more than 17% is up to 1.5 W, and the wavelength is defined at 1550.8nm with a line-width about 0.03nm.
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Hongxin Su, Zhiyang Wu, Lijing Xu, "All-fiber designed narrow line-width 1.55μm double cladding fiber lasers", Proc. SPIE 9266, High-Power Lasers and Applications VII, 92661F (18 November 2014); doi: 10.1117/12.2071987; https://doi.org/10.1117/12.2071987


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