基于光-光同步放大的时域整形技术

Temporal Shaping Technology Based on Optical-Optical Synchronization Amplification

在高能量抽运激光脉冲的传输与放大过程中,激光放大器的增益饱和效应会导致激光脉冲产生时域畸变,使输出激光脉冲无法保持其时域的平顶型分布。因此,需要对抽运激光脉冲进行时域预整形,以补偿放大器中的增益饱和。提出了一种基于光-光同步放大的时域整形技术来补偿增益饱和引入的时域畸变。该技术基于传统的放大模型,不受激光脉冲宽度的限制,操作简单,成本低廉。数值模拟结果表明,利用所提技术可以对激光系统的输入脉冲进行有效的时域整形,并且可以补偿增益饱和,从而获得时域平顶分布的输出脉冲。

The output laser pulse cannot sustain a flat-top temporal profile owing to the time domain distortion caused by gain saturation effect in laser amplifiers during the transmission and the amplification of high energy pump laser pulse. Therefore, the pump laser pulse needs to be pre-shaped to compensate the gain saturation in the amplifier. A temporal shaping technology based on optical-optical synchronization amplification is proposed to compensate the time domain distortion caused by gain saturation. The proposed technology is based on the conventional amplification model, and it is not restricted to the width of laser pulse. The proposed technology is simple to operate and costs low. Theoretical simulation results indicate that the effective temporal shaping for the input pulse of laser system can be achieved and the gain saturation can be compensated by the proposed technology, and the output pulse with flat-top shape in time domain can be obtained.