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Laser output and multiple pinches of plasma in capillary discharge

Published online by Cambridge University Press:  01 December 2008

ZHAO YONGPENG ,
WANG QI ,
XIE YAO ,
CHENG YUANLI  and
LUAN BOHAN
ZHAO YONGPENG
Affiliation:
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China (zhaoyp3@yahoo.com.cn)
WANG QI
Affiliation:
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China (zhaoyp3@yahoo.com.cn)
XIE YAO
Affiliation:
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China (zhaoyp3@yahoo.com.cn)
CHENG YUANLI
Affiliation:
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China (zhaoyp3@yahoo.com.cn)
LUAN BOHAN
Affiliation:
National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China (zhaoyp3@yahoo.com.cn)
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Abstract

The pinch process of plasma columns generated by capillary discharge is studied theoretically with a snow-plow model. The multiple pinch evolution of plasma is obtained from the theoretical results. The effects of pressure and current amplitude on multiple pinches are calculated, and the results show that the pinch time decreases nonlinearly with decreasing pressure or increasing current. In the experiment, the laser spike of Ne-like Ar at 46.9 nm is obtained with an X-ray diode (XRD). The pressure filling in the capillary is changed to observe the variation of lasing onset time. According to real current waveforms, the pinch process is simulated. The results show that the laser spike occurs around the third pinching time. In addition, the experimental results indicate that there is an optimum pressure for the laser output.

Type
Papers
Information
Journal of Plasma Physics , Volume 74 , Issue 6 , December 2008 , pp. 839 - 846
Copyright
Copyright © Cambridge University Press 2008

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