Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Short Wavelength Coherent Radiation: Generation and Applications

Observation of Electromagnetically Induced Transparency

Ataç İmamoğlu, Klaus J. Boller, Stephen E. Harris

Published Jan 1, 1991• 56 citations
Publisher

Abstract

We report the results of an experiment showing how an opaque atomic transition in neutral Sr may be rendered transparent to radiation at its resonance frequency. This is accomplished by applying an electromagnetic coupling field (Fig. 1) between the upper state 4d5d1D2 of the transition and another state 4d5p 1D2 of the atom. When the Rabi frequency of the coupling field exceeds the inhomogeneous width of the 5s5p1P1−4d5d1D2 transition, the medium becomes transparent on line center. In this work, we have changed the transmittance of neutral strontium from exp(−20) without a coupling laser to exp(−1) in the presence of a coupling laser, over a spectral range of 6 GHz (Fig. 2). The coupling laser that we have used is a single mode Littman dye laser with an intensity of 10 MW/ cm2 .

DOI
10.1364/swcr.1991.tub3

Related papers

Observation of electromagnetically induced transparency

Klaus J. Boller, Ataç İmamoğlu, Stephen E. Harris

We report the first demonstration of a technique by which an optically thick medium may be rendered transparent. The transparency results from a destructive interference of two dressed states which are created by applying a temporally smooth coupling laser between a bound state of an atom and the upper state of the transition which is to be made transparent. The transmittance of an autoionizing (ultraviolet) transition in Sr is changed from exp(-20) without a coupling laser present to exp(-1) in the presence of a coupling laser.

Physical Review Letters•May 20, 1991•3,061 citations

Quantum Theory of Electromagnetically Induced Transparency

Daniel F. Walls, Klaus M. Gheri

There have recently been several experiments which have observed electromagnetically induced transparency in atomic systems(1,2) This is based on the population trapping which may occur when two lower states are coupled to a common upper state by two laser fields. Due to destructive quantum mechanical interference this gives rise to a nonabsorbing resonance. Thus a strongly absorbing atomic transition may be rendered opaque.

Nonlinear Optics•Jan 1, 1992•0 citations

Rydberg electromagnetically induced transparency and absorption of strontium triplet states in a weak microwave field

Yan-Li Zhou, Dong Yan, Weibin Li

We study theoretically laser excitation of Rydberg triplet states of strontium atoms in the presence of weak microwave (MW) fields. Starting from the ground state $5{s}^{2}{\phantom{\rule{0.16em}{0ex}}}^{1}{S}_{0}$, the Rydberg excitation is realized through the metastable, triplet $5s5{p}^{3}{P}_{1}$ state, whose decay rate ${\ensuremath{\gamma}}_{2}$ is $2\ensuremath{\pi}\ifmmode\times\else\texttimes\fi{}7.5$ kHz, much smaller than the one in the singlet state or alkali-metal atoms. The influences of ${\ensuremath{\gamma}}_{2}$ on the transparency and absorption spectrum in the electromagnetically induced transparency (EIT), and electromagnetically induced absorption (EIA) regime are examined. Narrow transparent windows (EIT) or absorption peaks (EIA) are found, whose distance in the spectrum depends on the Rabi frequency of the weak MW field. It is found that the spectrum exhibits higher contrast than using the singlet state or alkali-metal atoms in typical situations. Using the metastable intermediate state, we find that the resonance fluorescence of Sr gases exhibits very narrow peaks, which are modulated by the MW field. When the MW field is weaker than the probe and control light, the spectrum distance of these peaks is linearly proportional to ${\mathrm{\ensuremath{\Omega}}}_{m}$. This allows us to propose an alternative way to sense very weak MW fields through resonance fluorescence. Our study shows that the Sr triplet state could be used to develop the Rydberg MW electrometry that gains unique advantages.

arXiv:2203.06885•Physical Review A•May 19, 2022•20 citations

Evidence for electromagnetically induced transparency in a solid medium

K. Ichimura, K. Yamamoto, Nobuhiro Gemma

Strong evidence indicating the occurrence of electromagnetically induced transparency (EIT) in a solid medium was found. Fluorescence reduction due to EIT was observed in solids. The excitation intensity dependence of the fluorescence reduction was found to be consistent with theoretical predictions for EIT. It was experimentally demonstrated that the essential condition for the observation of EIT in solids is that the Rabi frequency of excitation must be larger than the inhomogeneous width of the transition between the two states coupled to the third state by the pair of optical fields.

Physical Review A•Nov 1, 1998•71 citations

Observation of Electromagnetically Induced Transparency by a Train of Short Pulses

Ye Cun-Yun

We report the experimental demonstration of electromagnetically induced transparency in hot rubidium ( 85 Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman–Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of 85 Rb.

Chinese Physics Letters•May 1, 2004•2 citations

Observation of Electromagnetically Induced Transparency by a Train of Short Pulses

叶存云

We report the experimental demonstration of electromagnetically induced transparency in hot rubidium (^85Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman-Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of ^85Rb.

Chinese Physics Letters•Jan 1, 2004•0 citations
We report the results of an experiment showing how an opaque atomic transition in neutral Sr may be rendered transparent to radiation at its resonance frequency. This is accomplished by applying an electromagnetic coupling field (Fig. 1) between the upper state 4d5d1D2 of the transition and another state 4d5p 1D2 of the atom. When the Rabi frequency of the coupling field exceeds the inhomogeneous width of the 5s5p1P1−4d5d1D2 transition, the medium becomes transparent on line center. In this work, we have changed the transmittance of neutral strontium from exp(−20) without a coupling laser to exp(−1) in the presence of a coupling laser, over a spectral range of 6 GHz (Fig. 2). The coupling laser that we have used is a single mode Littman dye laser with an intensity of 10 MW/ cm2 .
We report the first demonstration of a technique by which an optically thick medium may be rendered transparent. The transparency results from a destructive interference of two dressed states which are created by applying a temporally smooth coupling laser between a bound state of an atom and the upper state of the transition which is to be made transparent. The transmittance of an autoionizing (ultraviolet) transition in Sr is changed from exp(-20) without a coupling laser present to exp(-1) in the presence of a coupling laser.
We study theoretically laser excitation of Rydberg triplet states of strontium atoms in the presence of weak microwave (MW) fields. Starting from the ground state 5s21S05{s}^{2}{\phantom{\rule{0.16em}{0ex}}}^{1}{S}_{0}5s21S0​, the Rydberg excitation is realized through the metastable, triplet 5s5p3P15s5{p}^{3}{P}_{1}5s5p3P1​ state, whose decay rate ${\ensuremath{\gamma}}_{2}$ is $2\ensuremath{\pi}\ifmmode\times\else\texttimes\fi{}7.5$ kHz, much smaller than the one in the singlet state or alkali-metal atoms. The influences of ${\ensuremath{\gamma}}_{2}$ on the transparency and absorption spectrum in the electromagnetically induced transparency (EIT), and electromagnetically induced absorption (EIA) regime are examined. Narrow transparent windows (EIT) or absorption peaks (EIA) are found, whose distance in the spectrum depends on the Rabi frequency of the weak MW field. It is found that the spectrum exhibits higher contrast than using the singlet state or alkali-metal atoms in typical situations. Using the metastable intermediate state, we find that the resonance fluorescence of Sr gases exhibits very narrow peaks, which are modulated by the MW field. When the MW field is weaker than the probe and control light, the spectrum distance of these peaks is linearly proportional to ${\mathrm{\ensuremath{\Omega}}}_{m}$. This allows us to propose an alternative way to sense very weak MW fields through resonance fluorescence. Our study shows that the Sr triplet state could be used to develop the Rydberg MW electrometry that gains unique advantages.
Strong evidence indicating the occurrence of electromagnetically induced transparency (EIT) in a solid medium was found. Fluorescence reduction due to EIT was observed in solids. The excitation intensity dependence of the fluorescence reduction was found to be consistent with theoretical predictions for EIT. It was experimentally demonstrated that the essential condition for the observation of EIT in solids is that the Rabi frequency of excitation must be larger than the inhomogeneous width of the transition between the two states coupled to the third state by the pair of optical fields.