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Conference on Lasers and Electro-Optics

Coherent control of birefringence

Anil K. Patnaik, G. S. Agarwal

Published Aug 29, 2005• 0 citations
Publisher

Abstract

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.

DOI
10.1109/iqec.2000.908076

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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 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.
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.
Summary form only given. Quantum coherence phenomena offer a powerful method of controlling the optical properties of an atomic vapor, such as the absorption and refractive index. We demonstrate the use of quantum coherence to induce controllable birefringence in an atomic vapor and to thereby provide complete and efficient control over the polarization state of a probe laser beam propagating through the vapor. Quantum coherence has been previously observed to produce small polarization rotations, but these experiments suffered from significant absorption loss and produced rotations of at most a few degrees. Our experiments demonstrate the ability to induce linear or circular birefringence in an initially isotropic system that can be used to change the polarization state of a probe beam from linear to any desired polarization state with a total energy throughput greater than 97%.
Abstract We investigate magneto-optical rotation (MOR) of surface plasmon polaritons (SPPs) at the interface of a metal and a four-level atomic system. The MOR of SPPs can be controlled and modified with the intensity and frequency of the applied fields. We show the birefringence enhancement of the weak probe fields propagating through the atomic medium in the presence of the static magnetic field. The external magnetic field has a vital role in the generation and control over the MOR of SPPs. The MOR completely stops when either the external magnetic field or the probe field or both are tuned to resonance. A pretty behavior of MOR of SPPs is observed for a specific set of control field frequency. The enhanced MOR of SPP has significant applications in atomic spectroscopy, optical communication, nano-photonics, optical switches, and precise measurement.
Abstract The interaction of two orthogonally polarized beams and a diamond nitrogen vacancy (NV) center sample is investigated. It is shown that applying a static magnetic field parallel to the propagation direction of the probe beam makes the diamond NV center sample a birefringent medium. Electromagnetically induced transparency (EIT) is attained under the assumption of specific parameters. Moreover, it is demonstrated that the magneto-optical rotation (MOR) can be manipulated by the control beam. Our results show that how a large and complete MOR can be obtained by adjusting the intensity of the magnetic field and the length of the diamond NV center sample.