We describe the cw and Q-switched actions of a novel erbium-doped crystal Er:Lu_(2)SiO_(5) pumped by a MgO:PPLN-OPO at 1536 nm.An efficient 1580.9 nm cw laser with the output power of 608 mW is obtained when the incident power is 4.5 W,corresponding to a slope efficiency of 11.1%.In the Q-switched operation,the pulse energy up to 1.2 mJ is obtained at a repetition rate of 200 Hz.
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