HIGH-EFFICIENCY ND-DOPED FIBER LASERS USING DIRECT-COATED DIELECTRIC MIRRORS

The letter presents an Nd-doped silica single-mode fiber laser with dielectric mirrors coated directly on to the fiber endfaces. The LD-pumped fiber laser had a cw output power of more than 4 mw, a threshold power of 1. 51 mw and a slope efficiency of 55%. The theoretically predicted values and experimental values of the laser characteristics are similar owing to a negligibly small excess cavity loss.