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Title: Coupling-intensity effects in ladder-type electromagnetically induced transparency of rubidium atoms

Abstract

We have studied electromagnetically induced transparency (EIT) in the 5S{sub 1/2}-5P{sub 3/2}-5D{sub 5/2} 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.

Authors:
; ;  [1];  [2]
  1. Division of Optical Metrology, Korea Research Institute of Standards and Science, 1 Doryong-Dong, Yuseong-Gu, Daejeon 305-340 (Korea, Republic of)
  2. (Korea, Republic of)
Publication Date:
OSTI Identifier:
20696583
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Optical Society of America. Part B, Optical Physics; Journal Volume: 22; Journal Issue: 12; Other Information: DOI: 10.1364/JOSAB.22.002529; (c) 2005 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMS; BEAM OPTICS; HYPERFINE STRUCTURE; LASER RADIATION; LASERS; NONLINEAR PROBLEMS; OPACITY; PHOTON-ATOM COLLISIONS; POLARIZATION; RUBIDIUM; SIGNALS; VISIBLE RADIATION

Citation Formats

Moon, Han Seb, Lee, Lim, Kim, Jung Bong, and Department of Physics Education, Korea National University of Education, Chung-buk, 363-791. Coupling-intensity effects in ladder-type electromagnetically induced transparency of rubidium atoms. United States: N. p., 2005. Web. doi:10.1364/JOSAB.22.002529.
Moon, Han Seb, Lee, Lim, Kim, Jung Bong, & Department of Physics Education, Korea National University of Education, Chung-buk, 363-791. Coupling-intensity effects in ladder-type electromagnetically induced transparency of rubidium atoms. United States. doi:10.1364/JOSAB.22.002529.
Moon, Han Seb, Lee, Lim, Kim, Jung Bong, and Department of Physics Education, Korea National University of Education, Chung-buk, 363-791. Thu . "Coupling-intensity effects in ladder-type electromagnetically induced transparency of rubidium atoms". United States. doi:10.1364/JOSAB.22.002529.
@article{osti_20696583,
title = {Coupling-intensity effects in ladder-type electromagnetically induced transparency of rubidium atoms},
author = {Moon, Han Seb and Lee, Lim and Kim, Jung Bong and Department of Physics Education, Korea National University of Education, Chung-buk, 363-791},
abstractNote = {We have studied electromagnetically induced transparency (EIT) in the 5S{sub 1/2}-5P{sub 3/2}-5D{sub 5/2} 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.},
doi = {10.1364/JOSAB.22.002529},
journal = {Journal of the Optical Society of America. Part B, Optical Physics},
number = 12,
volume = 22,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}
  • Subnatural linewidth in an optical transition in Cs was obtained by the suppression and recovery of the trapping of atoms. Cold Cs atoms in a magneto-optical trap (MOT) were irradiated using a weak probe laser to suppress MOT loading. When a counterpropagating coupling laser was directed to be resonant with the upper transition, the probe laser was induced to transmit and the MOT loading was recovered. This work investigates quantitatively this behavior by applying simulated electromagnetically induced transparency, taking into account the linewidth of the lasers as a decoherence source.
  • We report on the observation of electromagnetically induced transparency in a ladder system in the presence of a buffer gas. In particular, we study the 5S{sub 1/2}-5P{sub 3/2}-5D{sub 5/2} transition in thermal rubidium vapor with a neon buffer gas at a pressure of 6 Torr. In contrast to the line-narrowing effect of buffer gas on {Lambda} systems, we show that the presence of the buffer gas leads to an additional broadening of (34{+-}5) MHz, which suggests a cross section for Rb(5D{sub 5/2})-Ne of {sigma}{sub k}{sup (D)}=(23{+-}4)x10{sup -19} m{sup 2}. However, in the limit where the coupling Rabi frequency is largermore » than the collisional dephasing, a strong transparency feature can still be observed.« less
  • We develop a theory of electromagnetically induced transparency in a three-level, ladder-type Doppler-broadened medium, paying special attention to the case where the coupling and probe beams are counterpropagating and have similar frequencies, so as to reduce the total Doppler width of the two-photon process. The theory is easily generalized to deal with the [Lambda] configuration, where the ideal arrangement involves two copropagating beams. We discuss different possible regimes, depending on the relative importance of the various broadening mechanisms, and identify ways to optimize the absorption-reduction effect. The theory is compared to the results of a recent experiment (on a ladder-typemore » system), using the Rb [ital D]2 line, with generally very good agreement. The maximum absorption reduction observed (64.4%) appears to be mostly limited by the relatively large ([similar to]5 MHz) linewidth of the diode lasers used in our experiment.« less
  • Doubly dressed states in a ladder-type two-photon, three-level coupling system are observed. The electromagnetically induced transparency (EIT) doublet signal is interpreted as arising from the absorption and gain components of the Mollow spectrum. The separation of the EIT doublet matches the theoretical prediction. A numerical simulation demonstrates that the Doppler velocity group may perturb the light shift from the symmetric center of the EIT doublet. The quantum nature of the EIT system significantly suppresses Doppler broadening.
  • Based on the cesium 6S{sub 1/2}-6P{sub 3/2}-8S{sub 1/2} ladder-type atomic system, double-resonance optical pumping (DROP) spectra including electromagnetically induced transparency (EIT) effects have been investigated with a room-temperature cesium vapor cell. For both cases of the probe and the coupling laser beams passing through the cesium vapor cell with the counter-propagation (CTP) and co-propagation (CP) configurations, the DROP spectra measured in the experiment display explicitly different linewidths. Thanks to the EIT effect, the linewidth of the DROP spectrum is explicitly narrower for the CTP configuration than for the CP configuration. Experimental results agree with the theoretical analysis considering Doppler averaging.more » Furthermore, when the coupling laser has moderate power, the DROP spectrum for the CTP configuration clearly shows two components: the narrow part due to the EIT effect and the broad part caused by optical pumping (but these two different components are never seen in the CP configuration). Also, the effect of the intensity of the coupling and probe lasers on the DROP spectra is investigated.« less