飞秒激光激活条纹相机的实现与建模

Implementation and modeling of a femtosecond laser-activated streak camera.

作者信息

Zandi O, Wilkin K J, Centurion M

机构信息

Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.

出版信息

Rev Sci Instrum. 2017 Jun;88(6):063305. doi: 10.1063/1.4985008.

DOI:10.1063/1.4985008

PMID:28667974

Abstract

A laser-activated streak camera was built to measure the duration of femtosecond electron pulses. The streak velocity of the device is 1.89 mrad/ps, which corresponds to a sensitivity of 34.9 fs/pixels. The streak camera also measures changes in the relative time of arrival between the laser and electron pulses with a resolution of 70 fs RMS. A full circuit analysis of the structure is presented to describe the streaking field and the general behavior of the device. We have developed a general mathematical model to analyze the streaked images. The model provides an accurate method to extract the pulse duration based on the changes of the electron beam profile when the streaking field is applied.

摘要

搭建了一台激光激活条纹相机来测量飞秒电子脉冲的持续时间。该设备的条纹速度为1.89毫弧度/皮秒，对应灵敏度为34.9飞秒/像素。条纹相机还能测量激光脉冲和电子脉冲之间相对到达时间的变化，分辨率为均方根误差70飞秒。给出了该结构的完整电路分析，以描述条纹场和设备的一般行为。我们开发了一个通用数学模型来分析条纹图像。该模型提供了一种基于施加条纹场时电子束轮廓变化来提取脉冲持续时间的精确方法。