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Efficient diode-pumped Er:KLu(WO4)2 laser at ∼1.61 μm

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Abstract

We report on an efficient diode-pumped continuous-wave erbium-doped monoclinic double tungstate laser. It is based on a 1 at. % Er3+:KLu(WO4)2 (Er:KLuW) crystal cut along the Ng optical indicatrix axis. The Er:KLuW microchip laser, diode pumped at 0.98 μm, generates 268 mW at 1.610 μm with a slope efficiency of 30%. The output is linearly polarized (E||Nm), and the laser beam is nearly diffraction limited (Mp,m2<1.1). Spectroscopic properties of Er3+ in KLuW are also presented. The stimulated-emission cross-section σSE is 0.46×1020cm2 at 1.609μm for E||Nm. The microchip Er:KLuW laser outperforms the commercial Er,Yb:glass.

© 2018 Optical Society of America

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