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arXiv:2405.20036 · Journal of the Optical Society of America B

Chirp asymmetry in Zeeman electromagnetically induced transparency

Joseph Gorkos, Karsten Grenzig, Erfan Nasirzadeh Orang, Victoria Thomas, Declan Tighe, Michael Crescimanno

Published Dec 23, 2024• 0 citations
arXivHTMLPDF

Abstract

The simplest three-level system exhibiting electromagnetically induced transparency (EIT) exhibits an effective conjugation symmetry as well as a transposition symmetry. Breaking the conjugation symmetry leads to a distinct chirp asymmetry, i.e., the differential response to a frequency increase versus a frequency decrease. The dynamic range of the many tunable optical parameters of the Hanle–Zeeman EIT resonance makes it an ideal platform for testing the chirp asymmetry’s dependence on the CP-breaking parameter and broadening. We describe the theory and compare it to an experiment using 87 Rb in a buffer gas cell. In contrast with earlier multi-photon chirp asymmetry work, this present effort explores the asymmetry at nearly one-billionth the earlier chirp rate and fully explores its universal features. The chirp asymmetry may have metrological consequences for understanding systematic dependence on modulation/demodulation parameters.

DOI
10.1364/josab.544782

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The simplest three-level system exhibiting electromagnetically induced transparency (EIT) exhibits an effective conjugation symmetry as well as a transposition symmetry. Breaking the conjugation symmetry leads to a distinct chirp asymmetry, i.e., the differential response to a frequency increase versus a frequency decrease. The dynamic range of the many tunable optical parameters of the Hanle–Zeeman EIT resonance makes it an ideal platform for testing the chirp asymmetry’s dependence on the CP-breaking parameter and broadening. We describe the theory and compare it to an experiment using 87 Rb in a buffer gas cell. In contrast with earlier multi-photon chirp asymmetry work, this present effort explores the asymmetry at nearly one-billionth the earlier chirp rate and fully explores its universal features. The chirp asymmetry may have metrological consequences for understanding systematic dependence on modulation/demodulation parameters.
A theoretical model using density matrix approach has been presented to show the polarization dependence of Electromagnetically Induced Transparency (EIT) in cascade multilevel atomic system. EIT has already been investigated both theoretically and experimentally by using three-level system in lambda (Λ), vee (V), and cascade (Ξ) configurations. However there is asymmetry in absorption measurement. To understand this asymmetry we introduce hyperfine levels in EIT cascade system. We present a five-level atomic system, which is a simple case of87Rb. This study has been extended to investigate the polarization dependence of probe and control lasers on EIT. It has been observed that there is significant change in transparency window for different laser polarizations.
Rydberg atoms, with large principal quantum number n, have been widely investigated in recent years due to their peculiar properties, such as big sizes, long lifetimes and strong interactions with fields and other Rydberg atoms. Rydberg atoms are very sensitive to external fields due to their large polarizabilities scaling as n7.These make Rydberg atoms an ideal candidate for the quantum information, the many-body interaction, etc.In this work, we investigate the Rydberg atoms using electromagneticlly induced transparency (EIT) in a ladder three-level system. The EIT is a quantum interference effect between two excitation path-ways driven by two laser fields. The main idea is performed in a room temperature cesium vapor cell, where the probe laser frequency is modulated. The ground state (6P1/2), excited state (6P3/2), and Rydberg state (nS1/2) constitute a Rydberg three-level system, in which the probe laser is fixed to the 6S1/2 (F = 4)6P3/2 (F = 5) transition by saturated absorption spectrum technique, whereas the coupling laser is scanned across the 6P3/249S1/2 transition. We detect the demodulated EIT signal with the lock-in amplifier (SR830). The modulated EIT signal shows a two-peak structure. The measured spacing between two peaks increases with the frequency detuning, caused by the modulation amplitude, and half the spacing between the peak-to-peak is nearly 1.67 times the modulation amplitude of the probe laser; the measured result shows that the splitting is independent of the modulation frequency. The experimental results are in agreement with the theoretical calculations. The results in our work can be used for real-time monitoring of the laser-line profiles and the fluctuation of laser frequency.
Electromagnetically induced transparency (EIT) resonance is obtained in a Λ three-level configuration when the coupling field and the probe field satisfy the two-photon resonance condition. When an additional microwave field drives the transition between two low levels of the Λ three-level system the EIT is observed to split into multiple EITs. In this paper we present a theoretical study of this effect. The results show that the EIT resonance can be split into triplet and the spectral positions of EIT windows is determined by the intensity and the frequency of the microwave field. Therefore, a microwave field can be used to open more than one EIT windows and the EIT frequency tuning can be realized by controlling intensity and frequency of the microwave field.
A nondegenerate four-level N-type scheme was experimentally implemented to observe electromagnetically induced transparency (EIT) at the 87 Rb D 2 line. Radiations of two independent external-cavity semiconductor lasers were used in the experiment, the current of one of them being modulated at a frequency equal to the hyperfine-splitting frequency of the excited 5 P 3/2 level. In this case, apart from the main EIT dip corresponding to the two-photon Raman resonance in a three-level L-scheme, additional dips detuned from the main dip by a frequency equal to the frequency of the HF generator were observed in the absorption spectrum. These dips were due to an increase in the medium transparency at frequencies corresponding to the three-photon Raman resonances in four-level N-type schemes. The resonance shapes are analyzed as functions of generator frequency and magnetic field.
Abstract The features of electromagnetically induced transparency (EIT) in gas cells with antirelaxation coating of the walls are considered. It is shown that the simultaneous effect of the motion of atoms, the finite size of a cell, and the nondegeneracy of the ground state of atoms leads to a number of qualitative phenomena. In particular, even for the simplest three-level lambda scheme with a nondegenerate ground state, a significant difference in the spectra of EIT is revealed and investigated in detail depending on the relation between the frequencies of the probe and control fields, i.e., depending on whether the probe radiation is scattered in the Stokes or anti-Stokes channel. A significant spatial inhomogeneity of the excited low-frequency coherence is observed, which persists for large cells even far from their boundaries. In this case, the EIT resonances formed by atoms in different regions of a cell turn out to be differently shifted in frequency, which causes an additional inhomogeneous broadening of the observed profile. The observed effects are studied as a function of the nature of the accommodation of atoms on the surface of the antirelaxation coating.