An efficient cw single-mode double-clad Nd 3+ -doped fibre laser is developed which operates at room temperature in a quasi-three level scheme on the 925-nm 4 F 3/2 — 4 I 9/2 transition upon diode pump at 805 nm. The gain in the laser resonator at 1.06 μm is strongly suppressed due to a proper choice of the refractive index profile in the fibre core. The laser output power above 0.5 W is obtained with the slope efficiency exceeding 35 %.
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Bufetov et al. (2003) studied this question.