Generation of Terahertz Radiation by Atomic Systems at Different Ratios of Frequencies between Components of Interacting Two-Color Laser Fields

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Abstract

The generation of terahertz radiation by atomic systems interacting with femtosecond two-color laser fields (ω1 + ω2) formed by the fundamental harmonic of a laser source (ω1) and radiation with frequencies varying over a wide range (ω2) is studied. It is shown that the efficiency of the generation of terahertz radiation grows when ratio ω2ω1 of frequencies between components of the two-color field is close but not equal to 2, and difference |ω2 – 2ω1| corresponds to the terahertz range. A numerical experiment is performed using laser sources with wavelengths from the near- to far-infrared range.

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About the authors

S. Yu. Stremoukhov

Lomonosov Moscow State University; Kurchatov Institute

Author for correspondence.
Email: sustrem@gmail.com
Russian Federation, Moscow; Moscow

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2. Fig. 1. THz part of the photoemission spectra of the response of an argon atom interacting with a two-frequency laser field formed by the linearly polarised first harmonic of the laser source and radiation at a given frequency, calculated for different values of the frequency ratios of the field components. The calculation is carried out for λ = 800 nm (a), λ = 2000 nm (b), λ = 4600 nm (c). The other field parameters are μ01 =0.1, μ02 = 0.0147, t02 - t01 = 0, θ0 = 0, τ1 = τ2 =10Tλ

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3. Fig. 2. First peak of the THz part of the photoemission response spectra of an argon atom interacting with a dual-frequency laser field formed by the linearly polarised first harmonic of the laser source and radiation at a given frequency, calculated for ω2 / ω1 = 1.9 and several values of wavelengths. The other field parameters are: μ01 =0.1, μ02 = 0.0147, t02 - t01 = 0, θ0 = 0, τ1 = τ2 =10Tλ. Inset: dependence of the maximum magnitude of the first peak of THz radiation on wavelength

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