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Tạp chí Khoa học

The hyperfine structures of rubidium atom using electromagnetically induced transparency Cấu trúc siêu tinh tế của phân tử Rubidium sử dụng tính trong suốt cảm ứng điện từ

Hien Thi Dieu Nguyen

Published Sep 20, 2019• 0 citations
OpenAlex

Abstract

In this paper, we studied the hyperfine structures of the Rubidium in D states 5D5/2, 7D3/2, 7D5/2 using Electromagnetically Induced Transparency (EIT). In order to improve the EIT signal-to-noise ratio, the laser frequency was stabilized to a Rubidium hyperfine transition while the coupling laser scanned the transition of excited states. We compared the experimental data with the simulation one.

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•Sep 10, 2012•1 citation
In this paper, we studied the hyperfine structures of the Rubidium in D states 5D5/2, 7D3/2, 7D5/2 using Electromagnetically Induced Transparency (EIT). In order to improve the EIT signal-to-noise ratio, the laser frequency was stabilized to a Rubidium hyperfine transition while the coupling laser scanned the transition of excited states. We compared the experimental data with the simulation one.
We use the phenomenon of electromagnetically induced transparency in a three-level atomic system for hyperfine spectroscopy of upper states that are not directly coupled to the ground state. The three levels form a ladder system: the probe laser couples the ground state to the lower excited state, while the control laser couples the two upper states. As the frequency of the control laser is scanned, the probe absorption shows transparency peaks whenever the control laser is resonant with a hyperfine level of the upper state. As an illustration of the technique, we measure hyperfine structure in the 7 S 1/2 states of 85 Rb and 87 Rb, and obtain an improvement of more than an order of magnitude over previous values.
We have studied electromagnetically induced transparency (EIT) in the 5S1/2−5P3/2−5D5/2 ladder-type system of Rb. We observed relative changing magnitude of EIT hyperfine structures depending on not only the polarizations of the lasers but also the intensity of the coupling laser. The coupling-intensity effects are attributed to the nonlinear increase of the EIT signal to the coupling intensity. EIT signals nonlinear on the coupling intensity are analyzed by considering coherent interaction between atom and laser fields.
We investigate ladder-type electromagnetically induced transparency (EIT) in rubidium gas. The theoretical absorption profile of a weak probe laser beam at 780.2nm (5S1∕2→5P3∕2) is modeled in the presence of a strong coupling laser beam at 776.0nm (5P3∕2→5D5∕2) and the absorption transparency window is characterized. We use two grating-feedback diode lasers and observe EIT experimentally in rubidium and compare the results to the theory. This experiment brings quantum optics into the advanced undergraduate laboratory and utilizes equipment and expertise commonly available in laboratories equipped to perform diode-laser-based absorption spectroscopy of rubidium.
This thesis investigates the parameters of achieving electromagnetically induced transparency, or EIT. The technique of EIT manipulates the properties of atoms to partially cancel the usual absorption of laser light. In this experiment, the effect was observed using the D1 line of rubidium vapor and a Λ -configuration between the degenerate magnetic sublevels of the 5S1/2(F=1) and 5P1/2(F=1) hyperfine states. Among the parameters investigated were the linear and circular polarization of the light used to drive the transitions, the size of the laser beam used, the effects of the temperature of the rubidium interaction cell on EIT, the density of the rubidium atoms in the interaction cell, and the effects of changing the power of the fields used to drive the transitions. Careful measurements of these parameters were made.
[ANGLÈS] Rydberg atoms with principal quantum number n>>1 have extraordinary atomic properties including tunable long range dipole-dipole interactions that lead to the so called Rydberg blockade. Atoms excited to these particular levels have been shown to be excellent candidates to implement several quantum information tasks, from two-qubit gates to single photon sources. In this work, we demonstrate Electromagnetic Induced Transparency (EIT) using Rydberg levels in a hot gas of rubidium atoms. We then use the EIT window as a reference to stabilize the frequency of the coupling laser.