Pulse-dilation enhanced gated optical imager with 5 ps resolution (invited).
Pulse-dilation enhanced gated optical imager with 5 ps resolution (invited).
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DOI：
10.1063/1.3479111
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
T. Hilsabeck;J. Hares;J. Kilkenny;P. Bell;A. Dymoke-Bradshaw;J. Koch;P. Celliers;D. Bradley
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文献类型：
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作者：
T. Hilsabeck;J. Hares;J. Kilkenny;P. Bell;A. Dymoke-Bradshaw;J. Koch;P. Celliers;D. Bradley
一个5 ps的门控分幅相机演示使用漂移电子信号的脉冲膨胀。脉冲膨胀是通过用时变电势加速光电子导出的信息脉冲来实现的[R。D. Prosser，J.Phys.E9，57（1976）]。加速电势的时间依赖性导致出生时间依赖的轴向速度色散，该轴向速度色散在脉冲通过漂移区时扩展脉冲。扩展的脉冲，然后成像与传统的门控微通道板为基础的分帧相机和组合的仪器的有效门控时间比单独的分帧相机减少。在漂移区中，利用大的轴向磁场防止横向或图像平面中的电子图像散焦。与射频激发光电阴极的独特问题的细节进行了数值研究，并根据这一原则的原型仪器最近建成。用在266 nm处工作的三倍频飞秒激光测量仪器的时间分辨率。该系统展示了20倍的时间放大率，结果如下所示。惯性约束聚变内爆实验的X射线成像策略和光度计算也检查。
A 5 ps gated framing camera was demonstrated using the pulse-dilation of a drifting electron signal. The pulse-dilation is achieved by accelerating a photoelectron derived information pulse with a time varying potential [R. D. Prosser, J. Phys. E 9, 57 (1976)]. The temporal dependence of the accelerating potential causes a birth time dependent axial velocity dispersion that spreads the pulse as it transits a drift region. The expanded pulse is then imaged with a conventional gated microchannel plate based framing camera and the effective gating time of the combined instrument is reduced over that of the framing camera alone. In the drift region, electron image defocusing in the transverse or image plane is prevented with a large axial magnetic field. Details of the unique issues associated with rf excited photocathodes were investigated numerically and a prototype instrument based on this principle was recently constructed. Temporal resolution of the instrument was measured with a frequency tripled femtosecond laser operating at 266 nm. The system demonstrated 20× temporal magnification and the results are presented here. X-ray image formation strategies and photometric calculations for inertial confinement fusion implosion experiments are also examined.