title: Coherent detection of terahertz pulses via gas plasma induced by few-cycle laser pulses with fixed carrier envelope phase.
abstract: The time behavior of gas plasma induced by a few-cycle laser pulse with a simultaneously incident terahertz (THz) pulse is investigated via a transient photocurrent model. The results show that the second-harmonic intensity emitted from the gas plasma can well replicate the THz waveform if the laser pulse has a fixed carrier envelope phase. Based on these we propose a approach for THz coherent detection, which could realize coherent THz detection with very low laser energies and without a bias field, and may be very useful in some fields, such as remote THz sensing.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Liu
authors.forename: Hu
authors.initials: H
authors.lastname: Wang
authors.forename: Kejia
authors.initials: K
authors.lastname: Wang
authors.forename: Zhengang
authors.initials: Z
authors.lastname: Yang
authors.forename: Shenglie
authors.initials: S
authors.lastname: Wang