http://opticalengineering.spiedigitallibrary.org/article.aspx?articleid=2272700
Ji Zhao, YueJin Zhao
Beijing Institute of Technology, School of Optoelectronics, Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Room 6014, Optoelectronics Building, South Street of Zhongguancun, Beijing 100081, China
LiangLiang Zhang, Tong Wu, XiaoYan Xu, CunLin Zhang
Capital Normal University, Ministry of Education, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Beijing 100048, China
Opt. Eng. 54(4), 046104 (Apr 09, 2015). doi:10.1117/1.OE.54.4.046104
Abstract. Terahertz (THz) emission from laser-induced air plasma is a well known and widely used phenomenon. We report that when two laser beams from the laser creating two plasma filaments interact with each other, THz absorption is observed. We believe that a change in the refractive index of the plasma causes the THz-wave absorption. The following experimental results reveal that the THz absorption becomes more pronounced with increasing pump power and that the gas species surrounding the femtosecond laser filament can also influence the THz absorption rate.
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