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Laser Physics

Self-radiation of an absorbing medium induced by a fast frequency-tuning laser

S. N. Andreev, A. V. Mikhailov, Vladimir N Ochkin, Nikolai V. Pestovskii, S. Yu. Savinov

Published Dec 24, 2014• 1 citation
Publisher

Abstract

The self-radiation of an extended absorbing medium under the action of a laser field with a fast-changing frequency is studied. The oscillations in the time-dependent intensity of the medium radiation are found. These oscillations are caused by the beatings between the vibrations of the oscillator at the fast-changing exciting and constant resonance frequencies. The time duration between local peaks of the oscillations is inversely proportional to the difference between the resonance frequency of the oscillator and the instantaneous laser frequency.

DOI
10.1088/1054-660x/25/2/025701

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The self-radiation of an extended absorbing medium under the action of a laser field with a fast-changing frequency is studied. The oscillations in the time-dependent intensity of the medium radiation are found. These oscillations are caused by the beatings between the vibrations of the oscillator at the fast-changing exciting and constant resonance frequencies. The time duration between local peaks of the oscillations is inversely proportional to the difference between the resonance frequency of the oscillator and the instantaneous laser frequency.
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On-resonance self-action of a beam with periodically modulated amplitude in a two-level saturable absorber is studied numerically. When the period of modulation is comparable with relaxation times, one cannot describe the medium by means of susceptibility, and the response of the medium to the amplitude variation is not immediate. We solve the Bloch equations in each point of the medium to find this response correctly. Transient behavior followed by stable oscillations of population difference and polarization vector is shown to depend strongly on the frequency and amplitude of modulation. Beam propagation is considered using a simplified model of a thin absorber followed by free space, the propagation distance being small compared with the modulation wavelength. Manifestations of non-stationary response of the medium in the output intensity behavior are analyzed.
Numerical modeling of self-action of a beam, whose amplitude is periodically modulated in time, in a two-level saturable absorbing medium is reported. For describe a beam self-action we solve numerically the full set of Maxwell-Bloch equations. We study the influence of the non-stationary self-action of the beam on the transmission of modulation signal through the medium. It is shown that in the time dependence of the polarization and population difference the nonlinear distortions of the modulation signal can be much stronger than in the output field intensity.
It is shown that mechanical vibration (acoustical oscillation) of a solid medium along the propagation of multifrequency laser radiation enables one to control the resonant absorption. There exists an optimal spectral structure of the incident field dependent on vibration amplitude as well as the number and intensity of the frequency components that provides the full resonant transparency. A mechanism of the transparency is discussed. Transparency of this kind is shown to appear also via adiabatic modulation of the atomic transition frequency by an external microwave field.
The behavior of a pulse whose frequency sweeps through the resonance of a linear system, although first studied in spin resonance, is widely applicable to many wave phenomena. A frequency-swept optical pulse transmitted through a resonant medium develops intensity oscillations, which are the result of heterodyning the input pulse with the field radiated by the resonant system. This self-induced heterodyne signal allows the determination of the relative phase between the input pulse and the single frequency field radiated by the resonant system. A simple approximate model which very accurately describes the time evolution of the output pulse is given a physical and mathematical basis. Results for the optically thin case are extended to include the effects of propagation, revealing phenomena which have no spin-resonance analogy.