7 May 2013 Investigation of Yb:LuAG crystals with high doping concentration
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Two Yb:LuAG (Yb:Lu3Al5O12) plates (thickness 1.05 mm, diameter 3 mm, AR/AR @ 0.9 − 1.1 μm, Yb-doping c = 15% and 20 %) were prepared for laser experiments. For Yb:LuAG pumping, fibre coupled laser diode operating in pulsed regime was used (fibre core diameter 100 μm, emission wavelength 968 nm, pulse length 2 ms, repetition rate 10 Hz, maximum energy 40 mJ). The longitudinally pumped Yb:LuAG was placed inside the 148mm long resonator formed by a flat pumping mirror (HR @ 1.0 − 1.1 μm, HT @ 0.97 μm) and by a curved output coupler (radius of curvature 150 mm). Set of output couplers with reflectivity R = 70 − 97% @ 1.0−1.1 μm was used and the output power amplitude was measured in dependence on absorbed pumping power amplitude. It was found that for both samples the output coupler reflectivity had only minor influence on laser output parameters expect emission wavelength (1048nm for R < 90% and otherwise 1031 nm). The sample with lower concentration had a lower threshold (∼ 2.5W for c = 15% and ∼ 3.0W for c = 20%) and higher slope efficiency (∼ 61% for c = 15% and ∼ 50% for c = 20 %). The maximum output power amplitude 6.7W was obtained using Yb:LuAG with c = 20% and R = 92% for pumping power amplitude 14W. Obtained results confirmed the good quality of newly grown highly doped Yb:LuAG crystals.
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Jan Šulc, Jan Šulc, Zbyněk Hubka, Zbyněk Hubka, Helena JelÍnková, Helena JelÍnková, Karel Nejezchleb, Karel Nejezchleb, Václav Ŝkoda, Václav Ŝkoda, "Investigation of Yb:LuAG crystals with high doping concentration", Proc. SPIE 8780, High-Power, High-Energy, and High-Intensity Laser Technology; and Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers, 87800X (7 May 2013); doi: 10.1117/12.2017624; https://doi.org/10.1117/12.2017624

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