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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Resonance self-action and optical transient nutation in frequency-modulated cw laser beams

Inna L. Plastun, Artem Gennadievich Misurin

Published Feb 26, 2013• 3 citations
Publisher

Abstract

By numerical simulation we investigate the non-stationary manifestations and nonlinear dynamics of frequency - modulated cw laser beam propagated in resonance conditions. At modulation periods comparable with the atomic relaxation times the time dependence of the output intensity exhibits the manifestations of the optical transient nutation and resonance self-action effects. In the present paper we analyse the effect of resonance self-action on optical nutation and its dynamical manifestations.

DOI
10.1117/12.2019061

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By numerical simulation we investigate the non-stationary manifestations and nonlinear dynamics of frequency - modulated cw laser beam propagated in resonance conditions. At modulation periods comparable with the atomic relaxation times the time dependence of the output intensity exhibits the manifestations of the optical transient nutation and resonance self-action effects. In the present paper we analyse the effect of resonance self-action on optical nutation and its dynamical manifestations.
Self-action of a frequency-modulated laser beam, propagating through a two-level saturable absorber, is modeled numerically basing of the direct solution of Maxwell-Bloch equations. Following the common idea of spectroscopy, we plot the output intensity versus the input laser frequency that periodically changes in time. At modulation frequencies comparable with the relaxation rates the hysteresis loop is observed, i.e. the dependence of the transmitted intensity upon the instantaneous frequency depends on the direction of the frequency change. At large amplitudes of modulation coherent transient oscillations of the output intensity are observed.
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.