Electromagnetically-induced transparency and slow light in room temperature 4He

J. Ghosh; F. Goldfarb; J. L. Le Gouët; F. Bretenaker; R. Ghosh

doi:10.1134/S1054660X10090070

Electromagnetically-induced transparency and slow light in room temperature ⁴He

J. Ghosh
, F. Goldfarb
, J. L. Le Gouët
, F. Bretenaker
, R. Ghosh

Jawaharlal Nehru University
Mediterranean Technology Park
Laboratoire Aimé Cotton

Research output: Contribution to journal › Article › peer-review

Abstract

Electromagnetically-induced transparency (EIT) in three-level Λ-systems is based on quantum interference effects involving coherence between the two lower levels, which allow propagation of a resonant probe light beam in the presence of a strong coupling field. We have observed transparency in ultra-narrow (<10 kHz) windows at the resonant 1.083 μm transition for purely electronic spins in gaseous ⁴He* at room temperature. Slow light is an interesting outcome of the EIT phenomenon due to extreme dispersion within the narrow transparency window. We have obtained group delays of about 4 μs in a 2.5 cm long He* cell. A complete theoretical analysis explains our observations emphasizing the positive role of collisions. Slow light with 1-GHz Doppler broadening opens the door to applications of controllable large-bandwidth delays in radars.

Original language	English
Pages (from-to)	1234-1243
Number of pages	10
Journal	Laser Physics
Volume	20
Issue number	5
DOIs	https://doi.org/10.1134/S1054660X10090070
Publication status	Published - 1 May 2010
Externally published	Yes

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title = "Electromagnetically-induced transparency and slow light in room temperature 4He",

abstract = "Electromagnetically-induced transparency (EIT) in three-level Λ-systems is based on quantum interference effects involving coherence between the two lower levels, which allow propagation of a resonant probe light beam in the presence of a strong coupling field. We have observed transparency in ultra-narrow (<10 kHz) windows at the resonant 1.083 μm transition for purely electronic spins in gaseous 4He* at room temperature. Slow light is an interesting outcome of the EIT phenomenon due to extreme dispersion within the narrow transparency window. We have obtained group delays of about 4 μs in a 2.5 cm long He* cell. A complete theoretical analysis explains our observations emphasizing the positive role of collisions. Slow light with 1-GHz Doppler broadening opens the door to applications of controllable large-bandwidth delays in radars.",

author = "J. Ghosh and F. Goldfarb and \{Le Gou{\"e}t\}, \{J. L.\} and F. Bretenaker and R. Ghosh",

year = "2010",

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doi = "10.1134/S1054660X10090070",

language = "English",

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T1 - Electromagnetically-induced transparency and slow light in room temperature 4He

AU - Ghosh, J.

AU - Goldfarb, F.

AU - Le Gouët, J. L.

AU - Bretenaker, F.

AU - Ghosh, R.

PY - 2010/5/1

Y1 - 2010/5/1

N2 - Electromagnetically-induced transparency (EIT) in three-level Λ-systems is based on quantum interference effects involving coherence between the two lower levels, which allow propagation of a resonant probe light beam in the presence of a strong coupling field. We have observed transparency in ultra-narrow (<10 kHz) windows at the resonant 1.083 μm transition for purely electronic spins in gaseous 4He* at room temperature. Slow light is an interesting outcome of the EIT phenomenon due to extreme dispersion within the narrow transparency window. We have obtained group delays of about 4 μs in a 2.5 cm long He* cell. A complete theoretical analysis explains our observations emphasizing the positive role of collisions. Slow light with 1-GHz Doppler broadening opens the door to applications of controllable large-bandwidth delays in radars.

AB - Electromagnetically-induced transparency (EIT) in three-level Λ-systems is based on quantum interference effects involving coherence between the two lower levels, which allow propagation of a resonant probe light beam in the presence of a strong coupling field. We have observed transparency in ultra-narrow (<10 kHz) windows at the resonant 1.083 μm transition for purely electronic spins in gaseous 4He* at room temperature. Slow light is an interesting outcome of the EIT phenomenon due to extreme dispersion within the narrow transparency window. We have obtained group delays of about 4 μs in a 2.5 cm long He* cell. A complete theoretical analysis explains our observations emphasizing the positive role of collisions. Slow light with 1-GHz Doppler broadening opens the door to applications of controllable large-bandwidth delays in radars.

U2 - 10.1134/S1054660X10090070

DO - 10.1134/S1054660X10090070

M3 - Article

AN - SCOPUS:84856287416

SN - 1054-660X

VL - 20

SP - 1234

EP - 1243

JO - Laser Physics

JF - Laser Physics

IS - 5

ER -

Electromagnetically-induced transparency and slow light in room temperature 4He

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Electromagnetically-induced transparency and slow light in room temperature ⁴He