光学学报, 2009, 29 (4): 980, 网络出版: 2009-04-27
抽运光中ASE噪声对OPCPA信噪比的影响
Restrictions of Signal-to-Noise Ratio by Amplified Spontaneous Emission Noise of Pump Pulse in Optical Parametric Chirped Pulse Amplification System
快点火 信噪比 参变啁啾脉冲放大 放大的自发辐射 fast ignitor signal-to-noise ratio optical parametric chirped pulse amplification (OP amplified spontaneous emission (ASE)
摘要
惯性约束核聚变快点火实验, 要求拍瓦终端输出再压缩的高信噪比超短激光脉冲。在拍瓦前端光参变啁啾脉冲放大(OPCPA)阶段, 抽运激光脉冲中由放大的自发辐射(ASE)噪声调制导致的电场强度振幅和相位的随机扰动, 将会被传递到信号光的光谱上, 使再压缩后主激光脉冲前后出现底座, 降低了信号光的信噪比。数值模拟了抽运激光脉冲中ASE噪声对信噪比以及对时间底座的宽度的影响, 并探讨了有利于提高超短激光脉冲信噪比的途径。
Abstract
The fast ignitor scheme in inertial confined fusion requires ultrashort laser pulse with high signal-to-noise ratio (SNR). The amplified spontaneous emission (ASE) noise modulations in pump pulse are transferred onto the signal spectrum and these modulations of signal spectrum generate the time-pedestal before and after this main pulse, which degrades the signal-to-noise ratio. The restrictions of the SNR by the random ASE noise and the duration of its pedestal are numerically modeled. A number of ways that can reduce the noise level and increase the signal-to-noise ratio are discussed.
王艳海, 潘雪, 王江峰, 王利, 李学春, 林尊琪. 抽运光中ASE噪声对OPCPA信噪比的影响[J]. 光学学报, 2009, 29(4): 980. Wang Yanhai, Pan Xue, Wang Jiangfeng, Wang Li, Li Xuechun, Lin Zunqi. Restrictions of Signal-to-Noise Ratio by Amplified Spontaneous Emission Noise of Pump Pulse in Optical Parametric Chirped Pulse Amplification System[J]. Acta Optica Sinica, 2009, 29(4): 980.
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