Generation of intense terahertz radiation by two-color filamentation of laser pulses with different wavelengths

TL;DR

This paper theoretically investigates how two-color filamentation of ultrashort laser pulses across a broad wavelength range can optimize terahertz radiation generation, identifying conditions for maximum efficiency and intensity.

Contribution

It introduces a comprehensive analysis of wavelength-dependent parameters for two-color filamentation, revealing an optimal wavelength for intense THz pulse generation.

Findings

Optimal wavelength for maximum THz conversion efficiency identified.

Generation of extremely intense single-cycle THz fields demonstrated.

Dependence of filamentation parameters on laser wavelength analyzed.

Abstract

We theoretically study the generation of terahertz (THz) radiation by two-color filamentation of ultrashort laser pulses with different wavelengths. We consider wavelengths in the range from 0.6 to 10.6 $\mu$m, thus covering the whole range of existing and future powerful laser sources in the near, mid and far-infrared. We show how different parameters of two-color filaments and generated THz pulses depend on the laser wavelength. We demonstrate that there is an optimal laser wavelength for two-color filamentation that provides the highest THz conversion efficiency and results in generation of extremely intense single cycle THz fields.