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+3Yb+3, so as to allow lasing to occur at a lasing wavelength .lambda.L. A first pump signal (20) efficiently pumps the Yb to the excited state and the Yb energy is transitioned to the Er atoms which ultimately lase at the desire lasing frequency. Because Yb is pumped so 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 lasing 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.
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机译：一种双波长泵浦低噪声光纤激光器，包括光纤激光器（10），该光纤激光器在光纤激光器腔（18）的相对两端包括一对布拉格光栅（14、16），该布拉格光栅与两种稀土掺杂剂共掺杂， Er + 3Yb + 3，从而允许在激射波长λL发生激射。第一泵浦信号（20）有效地将Yb泵浦到激发态，并且Yb能量转变成Er原子，Er原子最终以期望的激射频率发射。由于如此高效地泵浦了Yb，因此实现了高泵浦吸收，从而提供了高激光输出功率，从而降低了RIN。同时，第二泵浦信号（52）直接以不同的波长λP2泵浦Er，从而更快地填充激光跃迁，从而允许对第二泵浦信号（52）进行闭环控制的足够带宽来控制低频由于激光中的弛豫振荡，导致RIN尖峰。
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