用于快速汤姆逊散射的脉冲串激光系统（特邀报告）

Pulse-burst laser systems for fast Thomson scattering (invited).

作者信息

Den Hartog D J, Ambuel J R, Borchardt M T, Falkowski A F, Harris W S, Holly D J, Parke E, Reusch J A, Robl P E, Stephens H D, Yang Y M

机构信息

Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.

出版信息

Rev Sci Instrum. 2010 Oct;81(10):10D513. doi: 10.1063/1.3475723.

DOI:10.1063/1.3475723

PMID:21033868

Abstract

Two standard commercial flashlamp-pumped Nd:YAG (YAG denotes yttrium aluminum garnet) lasers have been upgraded to "pulse-burst" capability. Each laser produces a burst of up to 15 2 J Q-switched pulses (1064 nm) at repetition rates of 1-12.5 kHz. Variable pulse-width drive (0.15-0.39 ms) of the flashlamps is accomplished by insulated gate bipolar transistor (IGBT) switching of electrolytic capacitor banks. Direct control of the laser Pockels cell drive enables optimal pulse energy extraction, and up to four 2 J laser pulses during one flashlamp pulse. These lasers are used in the Thomson scattering plasma diagnostic system on the MST reversed-field pinch to record the dynamic evolution of the electron temperature profile and temperature fluctuations. To further these investigations, a custom pulse-burst laser system with a maximum pulse repetition rate of 250 kHz is now being commissioned.

摘要

两台标准的商用闪光灯泵浦钕钇铝石榴石（YAG表示钇铝石榴石）激光器已升级为具备“脉冲串”能力。每台激光器能产生高达15个2焦耳的调Q脉冲（1064纳米）的脉冲串，重复频率为1 - 12.5千赫兹。闪光灯的可变脉宽驱动（0.15 - 0.39毫秒）通过绝缘栅双极晶体管（IGBT）对电解电容器组的开关操作来实现。对激光普克尔盒驱动的直接控制可实现最佳脉冲能量提取，并且在一个闪光灯脉冲期间能产生多达四个2焦耳的激光脉冲。这些激光器用于MST反向场箍缩装置上的汤姆逊散射等离子体诊断系统，以记录电子温度分布和温度波动的动态演变。为了进一步开展这些研究，目前正在调试一台最大脉冲重复频率为250千赫兹的定制脉冲串激光系统。