DUAL-WAVELENGTH PUMPED LOW NOISE FIBER LASER

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A dual-wavelength pumped low noise fiber laser includes a fiber laser (10) comprising a pair of Bragg gratings (14, 16) at opposite ends of a fiber laser cavity (18) which is co-doped with two rare-earth dopants, ER+3 Yb+3, so as to allow lasing to occur at a lasing wavelength .lambda.L. A first pump signal (20) efficiently pumps the Yb to t he excited state and the Yb energy is transitioned to the Er atoms which ultimately lase at the desire lasing frequency. Because Yb is pumped s o efficiently, high pump absorption is achieved, thereby providing high laser output power and, consequently, reduced RIN. Simultaneously, a second pump signal (52) directly pumps the Er at a different wavelength .lambda.P2 which populates the lacing transition more quickly, thereby allowing sufficient bandwidth of a closed loop control on the second pump signal (52) to control low frequency RIN spiking due to relaxation oscillations in the laser.