High-power linearly-polarized single-frequency thulium-doped fiber master-oscillator power-amplifier

Abstract

We report a high power narrow-linewidth source at ~2 μm based on a Tm-doped fiber distributed-feedback master-oscillator and three Tm fiber amplifier stages. The master-oscillator and first two amplifier stages were in-band pumped by Er,Yb fiber lasers operating at 1565 nm, and the final stage amplifier was cladding-pumped at 795 nm by two spatially combined diode-stacks. The MOPA yielded 100 W of single frequency output at 1943 nm with a beam propagation factor (M²) of 1.25 and with a polarization extinction ratio of >94%. The output power was limited by thermally-induced damage in the final amplifier stage. The prospects for further power scaling are considered.

Optics Express (2010) Vol.18(2) pp.1607-1612

doi: 10.1364/OE.18.001607

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