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Radially Polarized THz Wave Generation in Collisional Plasma: Influence of Sech Laser Pulses and Slanting Density Profiles
Jasveer Singh, Sunita Rani, Hitesh Kumar Midha, Vivek Sharma and Vishal Thakur
This study systematically investigates the efficiency of terahertz (THz) radiation generation in a collisional plasma medium with a slanting-up density profile, employing hyperbolic secant (sech) laser pulses. The analysis explores the influence of key plasma and laser parameters, including slanting plasma density, the sech parameter, collisional frequency, and transverse distance, on THz generation efficiency. The findings demonstrate that increasing slanting plasma density enhances THz efficiency due to stronger plasma inhomogeneity. Similarly, a higher sech parameter leads to improved efficiency by enhancing the coupling between the laser field and plasma electrons. Conversely, increasing collisional frequency results in reduced THz generation efficiency due to enhanced dissipative effects, which suppress coherent electron motion. Additionally, the transverse distance exhibits a non-monotonic effect, where efficiency initially increases, reaching an optimal peak before declining due to spatial dispersion and diffraction effects. The study further highlights that a more localized and intense sech pulse profile enhances energy transfer efficiency, optimizing THz radiation output. These insights contribute to the advancement of plasma-based THz sources for applications in spectroscopy, imaging, and high-speed communication.
Keywords: Terahertz generation, sech laser pulse, collisional plasma, slanting density profile, nonlinear wave interaction, energy efficiency, plasma-based THz source