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15 February 2012 Passive Q-switching of a diode-pumped (Tm,Yb):KLu(WO4)2 laser near 2-μm with a Cr2+:ZnS saturable absorber
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Passive Q-switching of a diode-pumped (Tm,Yb):KLu(WO4)2 laser, operating between 1910 and 1950 nm, has been achieved using polycrystalline Cr2+:ZnS as a saturable absorber in a hemispherical L-shaped cavity. The dependence on the doping levels of Tm and Yb and the low-signal absorption of the saturable absorber has been studied. The highest average output power reached 272 mW at a repetition rate of 2.04 kHz corresponding to a pulse energy of 133 μJ. This was achieved with (8.8 at. % Tm, 2.3 at. % Yb):KLu(WO4)2 active element and a saturable absorber with 85% lowsignal transmission. The highest pulse energy, 148 μJ, was achieved with the same combination at lower (0.94 kHz) repetition rate. The obtained pulse energy with the different samples is compared with theoretical analysis and the pulse duration and peak power are estimated from the calculations.
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Martha Segura, Xavier Mateos, Aleksey Tyazhev, Maria Cinta Pujol, Joan Josep Carvajal, Magdalena Aguiló, Francesc Díaz, Uwe Griebner, and Valentin Petrov "Passive Q-switching of a diode-pumped (Tm,Yb):KLu(WO4)2 laser near 2-μm with a Cr2+:ZnS saturable absorber", Proc. SPIE 8235, Solid State Lasers XXI: Technology and Devices, 82351U (15 February 2012);

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