Abstract
We present a simulation study of terahertz radiation from a gas driven by two-color laser pulses in a broad range of frequency ratios . Our particle-in-cell simulation results show that there are three series with ( is a positive integer) for high-efficiency and stable radiation generation. The radiation strength basically decreases with the increasing and scales linearly with the laser wavelength. These rules are broken when and much stronger radiation may be generated at any . These results can be explained with a model based on gas ionization by two linear-superposition laser fields, rather than a multiwave mixing model.
- Received 14 April 2017
DOI:https://doi.org/10.1103/PhysRevA.96.023844
©2017 American Physical Society