关键词: 太赫兹/
超快强激光场/
等离子体振荡频率
English Abstract
Frequency control of the broadband ultrashort terahertz source generated from the laser induced plasma by two-color pluses
Li Na,Bai Ya,
Liu Peng
1.State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 11274326, 61521093, 61405222, 11134010, 11127901) and the National Basic Research Program of China (Grant No. 2011CB808103).Received Date:01 February 2016
Accepted Date:04 March 2016
Published Online:05 June 2016
Abstract:The terahertz (THz) radiation becomes an attractive light source utilized in molecular dynamic spectroscopy, remote sensing, medicine, communication and fundamental research. The controlling of the THz spectrum is necessary for the applications. In this paper, a method is proposed for controlling the terahertz spectra generated from the laser induced plasma by two-color pluses based on the contribution of plasma oscillation. The plasma current oscillation can shift the THz spectrum when the length of medium is less than plasma skin depth. Experimentally we use a short length of molecules by means of the molecular beam method. We investigate the changing spectrum of broadband ultrashort terahertz THz generated from a jet of nitrogen (N2) molecules pumped with the two-color laser pulses following the varying plasma density and plasma length. With the increase of plasma density and the decrease of the plasma length, we observe the increase of THz central frequency (0.8-1.4 THz) and the broadening of the THz spectral width (0.78-1.53 THz). The analysis and the calculation show that the THz spectrum changes due to the frequency and the width of the plasma resonance. This scheme of controlling the THz spectrum by changing the plasma density and length is easier to implement and do not need to use complex shaped optical pulses. The discovery provides a new way of controlling the low-frequency broadband THz spectrum.
Keywords: terahertz/
ultrashort laser field/
plasma oscillation frequency
