Directionality of THz emission from photoinduced gas plasmas

Abstract

Forward and backward THz emission by ionizing two-color laser pulses in gas is investigated by means of a simple semi-analytical model based on Jefimenko's equation and rigorous Maxwell simulations in one and two dimensions. We find the emission in backward direction having a much smaller spectral bandwidth than in forward direction and explain this by interference effects. Forward THz radiation is generated predominantly at the ionization front and thus almost not affected by the opacity of the plasma, in excellent agreement with results obtained from a unidirectional pulse propagation model.

References in corpus (2)

• Ultrafast spatio-temporal dynamics of terahertz generation by ionizing two-color femtosecond pulses in gases
• Generation of terahertz radiation from ionizing two-color laser pulses in Ar filled metallic hollow waveguides

Cited by in corpus (7)

• Tailoring THz radiation by controlling tunnel photoionization events in gases
• Waveform-Controlled Terahertz Radiation from the Air Filament Produced by Few-Cycle Laser Pulses
• THz generation by optical Cherenkov emission from ionizing two-color laser pulses
• Transient Cherenkov radiation from an inhomogeneous string excited by an ultrashort laser pulse at superluminal velocity
• Broadband terahertz emission from two-color fs-laser-induced microplasmas
• The fundamental solution of the unidirectional pulse propagation equation
• Initial carrier-envelope phase of few-cycle pulses determined by THz emission from air plasma