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摘要

针对GaAs光电导开关快前沿正负对称脉冲输出特性的研究, 对提高飞秒条纹相机的时间分辨率具有重要意义. 本文使用脉宽为60 fs的激光器触发电极间隙为3.5 mm的GaAs光电导开关, 在不同的储能电容及外加偏置电压条件下, 获得具有上升时间最快为149 ps, 电压传输效率最高为92.9%的快前沿正负对称输出, 测试结果满足条纹相机实现飞秒时间分辨率的设计需求. 实验结果的对比分析表明, 储能电容是影响电压传输效率及上升时间的重要因素之一. 同时, 结合GaAs光电导开关线性工作模式特点及电容储能特性分析表明, 当触发激光特性相同时, 随着储能电容的增大, 输出电脉冲传输效率及上升时间均会增加. 研究结果将有助于GaAs光电导开关更好地应用于飞秒条纹相机中.

关键词:

Abstract

Femtosecond streak camera is currently the only diagnostic device with a femtosecond time resolution. Scanning circuit with bilateral symmetrical output is an important part of femtosecond streak camera. To achieve better performance of the streak camera, high requirements are placed on the output of scanning circuit. Owing to the excellent feature of litter time jitter and fast response speed, a GaAs photoconductive semiconductor switch (PCSS) has become a core device in the scanning circuit. Investigating the positive and negative symmetric pulses with fast rising edgeof GaAs PCSS is of great significance to improving the time resolution of femtosecond streak camera. In this paper, a laser with a pulse width of 60 fs was used to trigger a GaAs PCSS with an electrode gap of 3.5 mm. Under different storage capacitors and bias voltages, the positive and negative symmetric pulses withthe fastest rise time of 149 ps and the highest voltage transmission efficiency of 92.9% were obtained. The test results meet the design requirements of streak camera to realize femtosecond time resolution. Through the comparative analysis of the experimental values, it is concluded that the storage capacitor can affect the efficiency and rise time of the output electrical pulse in the same trigger laser pulse. By calculating the multiplication rate of carriers in combination with the output electrical pulse waveform, it is concluded that the GaAs PCSS operates in linear mode. According to the working characteristics of the linear mode and the energy storage characteristics of the capacitor, the analysis indicates that, when the characteristics of the trigger laser pulse are the same, the transmission efficiency and rise time of the output electric pulse voltage increase with the increase in storage capacitor, which is consistent with the experimental results. This study has a certain guiding significance for the better application of GaAs PCSS in femtosecond streak camera, which also has a certain propelling effect on improving the time resolution of femtosecond streak camera.

Keywords:

GaAs photoconductive semiconductor switch/
positive and negative symmetric pulse/
fast rising edge/
energy storage capacitance

作者及机构信息

桂淮濛^1,2,
施卫²

1.
2.

通信作者:施卫,swshi@mail.xaut.edu.cn

基金项目:国家重点研发计划(批准号: 2017YFA0701005)、强脉冲辐射环境模拟与效应国家重点实验室基金(批准号: SKLIPR1812)、陕西省科技计划项目(批准号：2019NY-174)和陕西省教育厅科学研究项目计划(批准号: 17JK0056)资助的课题

Authors and contacts

Gui Huai-Meng^1,2,
Shi Wei²

1.
2.

Corresponding author:Shi Wei,swshi@mail.xaut.edu.cn

Funds:Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0701005), the State Key Laboratory of Intense Pulsed Radiation Simulation and Effect of China (Grant No, SKLIPR1812), Shaanxi Science and Technology Project, China (Grant No. 2019NY-174), and the Special Scientific Research Plan of Shaanxi Provincial Education Department, China (Grant No. 17JK0056)

文章全文: translate this paragraph

参考文献

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施引文献

下载: 全尺寸图片幻灯片

电容容值/pF	传输效率/%
电容容值/pF	± 1.5 kV	± 1.7 kV	± 1.9 kV	± 2.0 kV
10	50.4	47.2	46.9	44.3
33	72.4	71.1	68.5	66.2
82	78.6	76.2	73.9	72.1
100	89.3	92.2	92.9	92.6

下载: 导出CSV

电容容值/pF	上升时间/ps
电容容值/pF	± 1.5 kV	± 1.7 kV	± 1.9 kV	± 2.0 kV
10	158	159	163	149
33	174	169	175	174
82	189	198	180	190
100	380	385	352	377

下载: 导出CSV

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