高峰值功率脉冲光纤激光器在激光雷达系统中有着广泛的应用。然而, 光纤激光器中放大自发辐射噪声(ASE)严重影响了系统的探测性能。提出一种测量高峰值功率脉冲光纤激光器中ASE噪声的方法。在该方法中, 首先对高峰值功率的激光脉冲衰减, 然后在时域分别测量和计算ASE噪声和激光脉冲的相对能量。给出了光纤激光器在驱动电流分别为6 A, 7 A和8 A时衰减后的ASE噪声廓线以及ASE噪声占激光脉冲能量的比例。

High power pulsed fiber lasers are attractive for light detection and ranging (lidar) systems. However, the amplified spontaneous emission (ASE) noise of the high power pulsed fiber laser degrades the system performance. A method to measure the ASE noise inherited in the high power pulsed laser is proposed. Using this new method, the high power laser is attenuated firstly, and then the relative energies of the ASE noise and the laser pulse are measured and calculated separately in time domain. The attenuated ASE noise profiles as well as the ratios of the ASE noise energy to the laser pulse energy are presented at different pump conditions.