A systematic investigation on a series of monoclinic Er3+:BaY2F8crystals with different dopant concentrations (CEr= 5%–30%) and crystal orientations was conducted to optimize the laser performance in this new 3-μm laser medium by laser diode pumping. The highest slope efficiency of 32% near the quantum defect (35%) was obtained with a 10% doped Er3+:BaY2F8crystal with the orientation (010) and a length of 3.5 mm. A maximum output power of 160 mW was achieved at an absorbed pump power of 550 mW at a wavelength of 970 nm.
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Eichler et al. (1997) studied this question.
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