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arXiv:1511.02739 · Physical Review A

Probing vacuum-induced coherence via magneto-optical rotation in molecular systems

Pardeep Kumar, Bimalendu Deb, Shubhrangshu Dasgupta

Published Jun 13, 2016• 4 citations
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Abstract

We investigate theoretically the effects of vacuum-induced coherence (VIC) on magneto-optical rotation (MOR). We carry out a model study to show that VIC in the presence of a control laser and a magnetic field can lead to large enhancement in the rotation of the plane of polarization of a linearly polarized weak laser with vanishing circular dichroism. This effect can be realized in cold molecular gases and may be used as a sensitive probe for VIC. Such a large MOR angle can also be used to detect weak magnetic field with large measurement sensitivity.

DOI
10.1103/physreva.93.063826

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We investigate theoretically the effects of vacuum-induced coherence (VIC) on magneto-optical rotation (MOR). We carry out a model study to show that VIC in the presence of a control laser and a magnetic field can lead to large enhancement in the rotation of the plane of polarization of a linearly polarized weak laser with vanishing circular dichroism. This effect can be realized in cold molecular gases and may be used as a sensitive probe for VIC. Such a large MOR angle can also be used to detect weak magnetic field with large measurement sensitivity.
We theoretically investigate magneto-optical rotation (MOR) of a linearly polarized probe field in the four-level N-type cold atoms. By applying a static magnetic field and a weak coupling field, it is shown that the birefringence enhancement is induced in the system. Moreover, we show that the static magnetic field has a major role in switching the dichroism to enhanced birefringence in the system. We also obtain a large intensity for the output field with nearly perpendicular MOR angle by 88 degrees with subnatural width. It is demonstrated that Doppler broadening has a destructive effect on the MOR of the polarization direction of the probe field. The results of our study can be used for selecting narrow band of wavelengths and polarization converter for efficient switching of TM/TE polarization modes in optical communication, the depolarization backscattering lidar, polarization spectroscopy and precision measurements.
We experimentally study the rotation of the plane of polarization of a laser beam passing through room-temperature Rb vapour. The rotation occurs because the medium behaves differently for the two orthogonally-polarized components, displaying what is known as circular birefringence or linear dichroism. The difference is induced either by a control laser applied to an auxiliary transition of a ladder-type system, or by an applied axial magnetic field. In the presence of both control laser and magnetic field, the line shape shows an interesting interplay between the two effects with regions of suppressed and enhanced rotation. The line shapes can be understood qualitatively based on a density-matrix analysis of the system.
Observation of magneto-optical rotation effects in cold 87^{87}87Rb atoms in an integrating sphere
We present a modified scheme for detection of the magneto-optical rotation (MOR) effect, where a linearly polarized laser field is interacting with cold 87^{87}87Rb atoms in an integrating sphere. The rotation angle of the probe beam's polarization plane is detected in the experiment. The results indicate that the biased magnetic field, the probe light intensity and detuning, and the cold atoms' temperature are key parameters for the MOR effect. This scheme may improve the contrast of the rotation signal and provide an useful approach for high contrast cold atom clocks and magnetometers.
We extend our earlier investigations [Opt. Commun. {\\bf 179}, 97 (2000)] on the enhancement of magneto-optical rotation (MOR) to include inhomogeneous broadening. We introduce a control field that counter-propagates with respect to the probe field. We derive analytical results for the susceptibilities corresponding to the two circular polarization components of the probe field. From the analytical results we identify and numerically demonstrate the region of parameters where significantly large magneto-optical rotation (MOR) can be obtained. From the numerical results we isolate the significance of the magnetic field and the control field in enhancement of MOR. The control field opens up many new regions of the frequencies of the probe where large magneto-optical rotation occurs. We also report that a large enhancement of MOR can be obtained by operating the probe and control field in two-photon resonance condition.
Summary form only given. Summary from only given. An isotropic medium, having atoms with m degenerate sublevels, when subjected to a magnetic field, can induce birefringence in the medium. As a result, the plane of polarization of a probe field rotates. This rotation is due to the fact that the magnetic field creates asymmetry between the susceptibilities /spl chi//spl plusmn/ of the medium corresponding to the /spl sigma//spl plusmn/ component of the probe field. We apply a coherent control field which modifies /spl chi//spl plusmn/. Therefore the rotation of probe polarization, due to magnetic field alone, can be controlled efficiently with the use of the control field. We demonstrate this enhancement of the magneto-optical rotation (MOR) of a linearly polarized light.
We investigate the effect of quantum interference due to the spontaneous emission on the linear magneto-optical rotation (MOR) in the V-type three-level atomic system. It is shown that, in the presence of a static magnetic field, the vacuum induced coherence can enhance birefringence via the Macaluso–Corbino effect. Moreover, it is demonstrated that the Doppler effect due to the motion of atoms plays a destructive role in the linear MOR. Our results show that birefringence enhancement due to spontaneously generated coherence (SGC) does not appear in the Λ-type three-level atomic system.