Terahertz wave generation by photo mixing of radially polarized hollow sinh super-Gaussian lasers in hot plasma

An analytical model for forward emission of radially polarized terahertz (THz) wave emission by photo mixing of two-color, radially polarized lasers having hollow sinh super-Gaussian envelopes in hot plasma with periodic density is developed. THz field distribution is optimized with the help of laser envelope parameters. Numerical investigations show that THz field amplitude is maximum at omega(1) - omega(2) approximate to omega(p) (resonant excitation). Our investigations show that THz field amplitude increases with electron temperature without affecting resonance condition. The position of THz field peaks shifts with laser parameters (i.e., orders of hollow sink and super-Gaussian, respectively) but not with electron temperature. It is also found that THz conversion efficiency increases manifold with the increase in electron temperature. Copyright (C) EPLA, 2019