Numerical Study of Spatial Chirp Distortion in Quasi-parametric Chirped-pulse Amplification

Numerical Study of Spatial Chirp Distortion in Quasi-parametric Chirped-pulse Amplification
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准参量啁啾脉冲放大中空间啁啾失真的数值研究

DOI:
10.1017/hpl.2022.10
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发表时间:
2022-05
期刊:
Cambridge University Press
影响因子:
--
通讯作者:
Liejia Qian
Liejia Qian
中科院分区:
其他
文献类型:
--
作者:
Yirui Wang;Jing Wang;Peng Yuan;Peng Yuan;Liejia Qian

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光学参量啁啾脉冲放大不可避免地受到高阶空间啁啾的影响,特别是在饱和放大和高斯泵浦的情况下,这对应着不可逆的时空失真,从而降低了可获得的最大聚焦强度。在这篇文章中,我们揭示了这种空间啁啾失真可以在具有闲置吸收的准参数啁啾脉冲放大(QPCPA)中得到显著的缓解。仿真结果表明,饱和QPCPA的聚焦光强质量接近理想,时空Strehl比大于0.98。随着种子带宽的增加,闲置吸收光谱可能不均匀,但QPCPA中的Strehl比仍然可以足够高,因为有更强的闲置吸收。
Optical parametric chirped-pulse amplification is inevitably subject to high-order spatial chirp, particularly under the condition of saturated amplification and a Gaussian pump; this corresponds to an irreversible spatiotemporal distortion and consequently degrades the maximum attainable focused intensity. In this paper, we reveal that such spatial chirp distortion can be significantly mitigated in quasi-parametric chirped-pulse amplification (QPCPA) with idler absorption. Simulation results show that the quality of focused intensity in saturated QPCPA is nearly ideal, with a spatiotemporal Strehl ratio higher than 0.98. As the seed bandwidth increases, the idler absorption spectrum may not be uniform, but the Strehl ratio in QPCPA can be still high enough due to stronger idler absorption.
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影响因子: 2.2
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