输出功率稳定的二级喇曼光纤激光器特性

提出一种输出功率稳定的二级喇曼光纤激光器,从理论分析角度探讨了它的特性.结果表明：由于在抽运光的二级斯托克斯光频附近的自发辐射光的钳制作用,激光器的一级和二级输出功率几乎都不受抽运功率波动的影响,从而降低了抽运光低频相对强度噪音转移|激光器输出的一级和二级斯托克斯光功率都很稳定,并且通过调节激光器结构中的可变衰减器,可以有效控制一级、二级激光的输出功率以及它们的比值.这些特性表明该喇曼光纤激光器很适合于作为喇曼光纤放大器的抽运源.

Characteristics of Dual-order Raman Fiber Laser with Stable Output Power

A dual-order Raman fiber laser (RFL) with stabilized output power is proposed and theoretically analyzed.The results show that the first- and second-order Stokes output powers are hardly impacted by the pump power fluctuations due to the clamping mechanism induced by the amplified spontaneous emission near the second-order Stokes shift from the launched pump line.As a result,the low-frequency relative-intensity-noise transfer from the pump power to the laser outputs is greatly suppressed.The results show that the first- and second-order Stokes are both stable.In addition,their powers can be tuned by adjusting one attenuator in the RFL setup.These special behaviors predict that the proposed RFL is highly suitable to be the pump sources in Raman fiber amplifiers.