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Updated: May 31, 2026
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Efficient terahertz emission by mid-infrared laser pulses from gas targets
Wei-Min Wang1, Shigeo Kawata, Zheng-Ming Sheng
1Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China. hbwwm1@iphy.ac.cn
Abstract:
It is shown by simulations that terahertz (THz) radiation can be produced more efficiently by a mid-infrared laser pulse from a gas target. The THz amplitude is enhanced by 35 times as the laser wavelength increases from 1 μm to 4 μm; a 4 μm laser at 10(15) W cm(-2) produces 5 MV/cm THz radiation. The THz amplitude changes oscillatingly with increasing laser intensity for a given laser wavelength. In addition, the laser intensity threshold for the THz emission is lower for a longer laser wavelength.
