All-fiber designed narrow line-width 1.55μm double cladding fiber lasers

摘要

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 Er~(3+)/Yb~(3+) co-doped double-clad gain fiber, multimode 976nm pump laser diode, double-clad fiber Bragg gratings (FBGs) and (1+1) × 1 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 155O.8nm with a line-width about 0.03nm.