We report on an efficient diode-pumped continuous-wave erbium-doped monoclinic double tungstate laser. It is based on a 1 at. % Er:KLu(WO) (Er:KLuW) crystal cut along the N 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||N), and the laser beam is nearly diffraction limited (Mp,m2<1.1). Spectroscopic properties of Er in KLuW are also presented. The stimulated-emission cross-section σ is 0.46×10 cm at ∼1.609 μm for E||N. The microchip Er:KLuW laser outperforms the commercial Er,Yb:glass.
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| http://dx.doi.org/10.1364/OL.43.000218 | DOI Listing |
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