Harmonics generation and intense terahertz radiation from polar molecules at multiphoton resonant excitation in laser fields

TL;DR

This paper investigates how two-level polar molecules can generate intense, tunable terahertz radiation through multiphoton resonant excitation, combining analytical and numerical methods to understand harmonic and low-frequency spectrum generation.

Contribution

It introduces a mechanism for generating intense, tunable terahertz radiation using two-level polar molecules with permanent dipole moments under multiphoton excitation.

Findings

Demonstrates the generation of harmonic and low-frequency radiation spectra.

Proposes a tunable terahertz radiation mechanism based on molecular configurations.

Provides analytical and numerical analysis of the radiation spectrum.

Abstract

The coherent radiation spectrum of two-level polar molecules with UV transition is studied at the multiphoton resonant excitation by a moderately strong laser field. The spectrum corresponding to harmonic generation and low-frequency radiation is investigated both analytically and numerically. Specifically, a mechanism for generation of intense smoothly tunable terahertz radiation by two-level molecular configurations (with dynamic Stark shifts) possessing permanent dipole moments, is considered.