Abstract

High power linearly polarized narrow linewidth light source above the wavelength of 1600 nm are very attractive for several applications such as pump source for Cr:ZnS[1], Tm:Re₂O₃ (Re=Sc.Lu or Y) or nonlinear frequency conversion. Er ( or Er:Yb)fibers are most popular gain media around the wavelength of 1.55 μm, though, there are few reports of Er fiber lasers above 1600 nm satisfying aforementioned properties, because the emission cross section/excited state absorption of Er ion increases/decreases as the wavelength increases[2]. They cause a difficulty of the suppression of stimulated Brillouin scattering (SBS) and amplified spontaneous emission (ASE) of Er and Yb ions. In this report, we developed a 1610 nm high power (8 W) narrow-linewidth (<25 MHz) linearly-polarized (~28 dB) Er:Yb all-PM-fiber MOPA system.

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