啁啾堆积脉冲传输过程中的小尺度自聚焦效应
Small scale self-focusing effect of stacked chirped pulse propagation
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摘要: 研究了啁啾堆积脉冲的时间精细结构与子脉冲带宽、相位、啁啾量等因素的关系。结果表明:随着子脉冲带宽的微小变化，啁啾堆积脉冲的峰值功率为相同输出能力窄带脉冲功率的1.5~3.0倍；当子脉冲间存在着随机相位扰动时，啁啾堆积的峰值功率约为相同输出能力窄带脉冲功率的3倍。建立了啁啾堆积脉冲的时空非线性传输放大模型，模拟得到堆积脉冲传输过程中的非线性增长因子，并与相同能量的窄带脉冲进行了比较，揭示了啁啾堆积脉冲在高功率激光装置中的传输放大过程中出现的一些新现象以及可能导致的后果。Abstract: Fine structure of the temporal distribution of stacked chirped pulse is discussed with different spectral width, phase and chirp. The peak power of stacked pulse is 1.5 to 3.0 times of narrow band pulse with small variation of spectral width and it is always 3.0 times of narrowband pulse with random phase fluctuation. Theoretical nonlinear propagation model of stack pulse is established. Numerical simulation shows that stacked chirped pulse has larger small scale modulation gain than narrow band pulse with the same energy. It is indicated that nonlinear optical damage may occur when we use stacked chirped pulse in high power laser systems.
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Key words:
- nonlinear propagation /
- chirped pulse /
- b-t theory /
- small scale self-focusing
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