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

Optical activity in the region of interfering laser-induced continuum structures

Грызлова Елена Владимировна, Alexei N. Grum-Grzhimailo, Alexandr I. Magunov, С. И. Страхова

Published Jun 15, 2007• 1 citation
Publisher

Abstract

Optical activity of atomic medium with interfering laser induced continuum structures is studied theoretically and illustrated by the example of hydrogen. The optically active region in the atomic spectrum is scanned by linearly polarized probe field whose polarization properties are changed by the medium. Analytical equations for acquired ellipticity and polarization plane rotation are obtained. They demonstrate that the optical activity is a non-trivial function of the parameters of the driving laser fields. Numerical results are presented for the VUV probe radiation with two circularly polarized lasers, coupling the hydrogen Ep continuum with the 2s and the 5s, 5d states, respectively.

DOI
10.1117/12.752270

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Optica Acta International Journal of Optics•Aug 1, 1986•1 citation
Optical activity of atomic medium with interfering laser induced continuum structures is studied theoretically and illustrated by the example of hydrogen. The optically active region in the atomic spectrum is scanned by linearly polarized probe field whose polarization properties are changed by the medium. Analytical equations for acquired ellipticity and polarization plane rotation are obtained. They demonstrate that the optical activity is a non-trivial function of the parameters of the driving laser fields. Numerical results are presented for the VUV probe radiation with two circularly polarized lasers, coupling the hydrogen Ep continuum with the 2s and the 5s, 5d states, respectively.
The ensemble of helium atoms in two electromagnetic fields has been investigated. The laser field coupling results in interference between two helium autoionizing states (AIS). The probe field scans the region of AIS and leads to photoionization. Rotating wave approximation was used to obtain the density matrix equation de­scribing the process. Nonlinear susceptibility of the atomic ensemble at the probe field frequency was found. Nonlinear effects such as polarization plane rotation and acquired ellipticity are calculated.
Optical activity of xenon atoms in the vacuum UV range induced by circularly polarized laser light is studied theoretically. The optical activity arises in the vicinity of the autoionizing state 5p 5(2 P 1/2)8s′ [12]1 \left[ {\frac{1} {2}} \right]_1 [21​]1​ as a result of its coupling via the laser field with the discrete state 5p 5(2 P 3/2)7p [12]1 \left[ {\frac{1} {2}} \right]_1 [21​]1​ . Polarization variations of the vacuum UV radiation upon its propagation through the atomic medium are calculated, and the possibility of controlling this polarization is discussed. Manifestations of nonresonant coupling of the discrete state with the broad autoionizing state 5p 5(2 P 1/2)6d′ [12]1 \left[ {\frac{1} {2}} \right]_1 [21​]1​ induced by the overlap of the Rydberg autoionizing series in xenon are studied.
Abstract An achiral system bathed in an intense beam of circularly polarized light shows chiral behaviour which may be detected with an auxiliary beam of polarized light. In this paper, expressions are derived for differential absorption rates, optical rotation of a plane polarized probe beam and circular differential scattering intensities. The theory of these two, three and four photon processes is developed by using quantum electrodynamics in electric dipole approximation. Two types of circular dichroism are distinguished: (a) the transition exhibiting induced dichroism is one-photon allowed, with chirality induced by scattering of the laser beam, or (b) the transition is two-photon allowed with absorption of a photon from each beam. In both, the induced circular dichroism is linearly dependent on the intensity of the inducing beam. Circular dichroism of type (a) is also discussed from the dressed-molecule viewpoint, and it is shown how a canonical transformation may be used to recover the results more simply. The possibility of observing Doppler-free circular dichroism is indicated. The induced optical rotation is analysed as a two-state process with transitions involving change of polarization only. The angle of rotation is linearly dependent on the intensity of the intense beam; its sign depends on the helicity. It is shown that, for non-forward Rayleigh scattering of the probe beam in the presence of an intense beam of light, the scattering intensity depends on the relative helicities of the two beams, and the differential intensity is proportional to the incident intensities.
A theoretical calculation of the polarization changes of a weak probe laser beam as it traverses a strongly pumped gaseous atomic medium is presented. The medium is chosen to be a three-level cascade (J = 0–J = 1–J = 0) system. The polarization of the probe changes from linear to elliptical owing to the asymmetrical population transfer induced by a strong, circularly polarized pumping laser beam. We study this phenomenon as a function of laser intensities, laser detunings, and the relaxation parameters of the medium. We compare the predictions of the theory with results obtained from experimental studies of the neon 1s4(J = 1)–2p4(J = 2)–3s2(J = 1) system.
We demonstrate a type of chiral effect of an atomic medium. Polarization rotation of a probe beam is observed only when both a magnetic field and a linearly polarized coupling beam are present. We compare it with other chiral effects like optical activity, the Faraday effect, and the optically induced Faraday effect from the viewpoint of spatial inversion and time reversal transformations. As a theoretical model we consider a five-level configuration involving the cesium D2D2D2 transition. We use spin-polarized cold cesium atoms trapped in a magneto-optical trap to measure the polarization rotation versus probe detuning. The result shows reasonable agreement with a calculation from the master equation of the five-level configuration.
A theoretical investigation of the change in polarization of ultrashort pulses of light near the two-photon resonance is carried out. A strong wave of circular polarization in the medium induces optical anisotropy which affects the change in weak probe-wave polarization. It is shown, that owing to an interaction transient, the probe-wave polarization becomes elliptical whose parameters change depending on time and position. This leads, in turn, to oscillation dependence of the rotated component of the probe field amplitude on the pumping energy, and the length and density of the resonant medium.