Abstract
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.
Highlights
We theoretically investigate magneto-optical rotation (MOR) of a linearly polarized probe field in the four-level N-type cold atoms
It is shown that using a weak coupling field and a static magnetic field, a birefringence enhancement is induced in the system
It should be noted that Ty is the intensity of the output field with rotated polarization direction, while Tx is the intensity of the output field in input polarization direction
Summary
The transmitted probe fields with different polarizations are detected by PhotoDiodes PD1 and PD2 from both channels of P2 It allows simultaneous measurements of the polarization rotation angle and the transmitted fields intensities. Rotation of the polarization plane of the probe field passing through a medium can be resulted in either birefringence or dichroism induced in the system. Difference between the real (imaginary) part of the normalized susceptibilities S± leads to difference between the dispersions (absorptions) of the right- and left- circular components of the linearly polarized probe field making the medium to show birefringence (dichroism) behavior. When β is positive and αlβ 1, the intensity of the probe field is not attenuated passing through the medium In this case, the probe field rotates only due to the birefringence induced in the medium. The situation is different for negative β in which the propagating probe field experiences a gain, leading to amplification of the rotated probe field
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
