Terahertz radiation emission from three-color laser-induced air plasma Hajar Alirezaee, Mehdi Sharifian, Seyyed Mohammad Reza Darbani, Masoud Saeed, Abdollah Eslami Majd and Ali Reza Niknam Eur. Phys. J. Plus, 135 4 (2020) 342 Published online: 31 March 2020 DOI: 10.1140/epjp/s13360-020-00320-z