Chirp effect in hard X-ray generation from liquid target when irradiated by femtosecond pulses
Chirp effect in hard X-ray generation from liquid target when irradiated by femtosecond pulses
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DOI：
10.1364/oe.16.012650
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发表时间：
2008-08-18
期刊：
影响因子：
3.8
通讯作者：
Misawa, Hiroaki
中科院分区：
文献类型：
--
作者：
Hatanaka, Koji;Ida, Takahito;Misawa, Hiroaki
系统研究了飞秒脉冲辐照下 CsCl 水溶液射流 X 射线发射强度的啁啾效应。与由光谱带宽决定的最短脉冲相比，p 偏振线性调频脉冲更有效。与变换限制的 160 fs 脉冲相比，大约 240 fs 持续时间的负啁啾脉冲产生的 X 射线强度高出 10 倍。 X 射线产生的角度依赖性可以通过共振吸收来解释。由于雪崩和多光子吸收而导致的电子密度演化的数值模拟很好地支持了实验观察结果。 (c) 2008 年美国光学学会。
The chirp effect on a X-ray emission intensity from a CsCl aqueous solution jet irradiated by femtosecond pulses was systematically studied. The p-polarized chirped pulses were more efficient as compared with the shortest pulses determined by the spectral bandwidth. The negatively-chirped pulses of approximately 240 fs duration produced up to 10 times larger X-ray intensity as compared with the transform-limited 160 fs pulses. The angular dependence of X-ray generation can be explained by the resonant absorption. Numerical simulations of electron density evolution due to the avalanche and multi-photon absorption supports qualitatively well the experimental observations. (c) 2008 Optical Society of America.