Broadband terahertz emission from two-color fs-laser-induced microplasmas

Abstract

We investigate terahertz emission from two-color fs-laser-induced microplasmas. Under strongest focusing conditions, microplasmas are shown to act as point-sources for broadband terahertz-to-far-infrared radiation, where the emission bandwidth is determined by the plasma density. Semi-analytical modeling allows us to identify scaling laws with respect to important laser parameters. In particular, we find that the optical-to-THz conversion efficiency crucially depends on the focusing conditions. We use this insight to demonstrate by means of Maxwell-consistent 3D simulations, that for only 10-$\mu$J laser energy a conversion efficiency well above $10^{-4}$ can be achieved.

References in corpus (7)

• Ultrafast spatio-temporal dynamics of terahertz generation by ionizing two-color femtosecond pulses in gases
• Tailoring THz radiation by controlling tunnel photoionization events in gases
• Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape
• THz generation by optical Cherenkov emission from ionizing two-color laser pulses
• Theory of terahertz emission from femtosecond-laser-induced micro-plasmas
• Directionality of THz emission from photoinduced gas plasmas
• Modelling arbitrarily shaped and tightly focused laser pulses in electromagnetic codes

Cited by in corpus (4)

• Terahertz pulse generation by two-color laser fields with circular polarization
• Terahertz emission from laser-driven gas-plasmas: a plasmonic point of view
• Maxwell-consistent, symmetry- and energy-preserving solutions for ultrashort laser pulse propagation beyond the paraxial approximation
• A Study on Angular Distribution of THz Radiation Driven by Two-Color Laser-induced Microplasma