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Jinshu Wang *, Wei Liu, Yiman Wang, Meiling Zhou, Tieyong Zuo
The Key Lab of Advanced Functional Materials, Ministry of Education China, School of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China
* E-mail: wangjsh@bjut.edu.cn
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Abstract: Terahertz (THz) radiation from air-plasma produced with two-color femtosecond laser pulses has been measured with controlled pump laser energy by an aperture before the laser focusing lens. It is found that the THz amplitude first increases with the laser energy. With the further increase of the laser energy over 320 mJ, the THz amplitude begins to decrease. This is attributed to the phase-shift between the fundamental pump pulse and its second harmonic along the laser filament, which depends upon the air-plasma length and the corresponding plasma density.
Keywords: Terahertz radiation, Air-plasma, Aperture, Two-color lasers.
Received: 2010-8-30
Accepted: 2011-1-26
Published: 2011-6-30
Acknowledgments: This work is sponsored by National Nature Science Foundation of China 51071005, Beijing Natural Science Foundation 2102007, Program for Excellent Talents in Beijing PHR201006101, Doctoral Fund of Ministry of Education of China 20101103110018.
Cite this article:
Jinshu Wang, Wei Liu, Yiman Wang, Meiling Zhou, Emission Property of Sc2O3-W Matrix Cathode and Generation of High Current Density Sheet Beams for THz Vacuum Electron Sources[J]. International Journal of Terahertz Science and Technology, 2011, Vol.4, No.2: 50-58. DOI:10.11906/TST.050-058.2011.06.07
URL: http://www.tstnetwork.org/10.11906/TST.050-058.2011.06.07
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