Abstract
We experimentally measured the relative contrast of an electromagnetically-induced transparency (EIT) spectrum with two cw lasers in a Λ-type system of magneto-optically trapped 87Rb atoms, which is a perturbed cold atomic medium. The contrast depends nonlinearly on the power of the coupling beam. Experimental results showed good agreement qualitatively with the simulation results considering the trapping magnetic field gradient, which induced detuning of the coupling laser. We used a free expanding cold atomic cloud that had a temperature of (36 ± 1) µK. To observe the EIT spectrum in the non-perturbed medium, we used two pulsed lasers. We observed that the relative contrast in the unperturbed medium was three times higher than that in the perturbed medium under our experimental conditions.
Similar content being viewed by others
References
K. J. Boller, A. Imamoglu and S. E. Harris, Phys. Rev. Lett. 66, 2593 (1991).
S. E. Harris, J. E. Field and A. Kasapi, Phys. Rev. A 46, R29 (1992).
M. D. Lukin, Rev. Mod. Phys. 75, 457 (2003).
M. Fleischhauer, A. Imamoglu and J. P. Marangos, Rev. Mod. Phys. 77, 633 (2005).
D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair and M. H. Dunn, Phys. Rev. A 52, 2302 (1995).
M. Xiao, Y. Q. Li, S. Z. Jin and J. Gea-Banacloche, Phys. Rev. Lett. 74, 666 (1995).
R. R. Moseley, S. Shepherd, D. J. Fulton, B. D. Sinclair and M. H. Dunn, Phys. Rev. Lett. 74, 670 (1995).
H. S. Moon, S. E. Park, Y. H. Park, L. Lee and J. B. Kim, J. Opt. Soc. Am. B 23, 2393 (2006).
A. Kuzmich, W. P. Bowen, A. D. Boozer, A. Boca, C. W. Chou, L. M. Duan and H. J Kimble, Nature 423, 731 (2003).
M. D. Lukin and A. Imamoglu, Nature 413, 273 (2001).
L. V. Hau, S. E. Harris, Z. Dutton and C. H. Behroozi, Nature 397, 594 (1999).
D. F. Phillips, A. Fleischhauer, A. Mair, R. L. Walsworth and M. D. Lukin, Phys. Rev. Lett. 86, 783 (2001).
S. A. Hopkins, E. Usadi, H. X. Chen and A. V. Durrant, Opt. Commun. 138, 185 (1997).
F. S. Cataliotti, C. Fort, T. W. Hänsch, M. Inguscio and M. Prevedelli, Phys. Rev. A 56, 2221 (1997).
V. B. Tiwari, S. Singh, H. S. Rawat, M. P. Singh and S. C. Mehendale, J. Phys. B: At. Mol. Opt. Phys. 43, 095503 (2010).
Y. C. Chen, C. W. Lin and I. A. Yu, Phys. Rev. A 61, 053805 (2000).
X. G. Wei, J. H. Wu, G. X. Sun, Z. Shao, Z. H. Kang, Y. Jiang and J. Y. Gao, Phys. Rev. A 72, 023806 (2005).
B. Lu, W. H. Burkett and M. Xiao, Phys. Rev. A 56, 976 (1997).
U. D. Rapol, A. Wasan and V. Natarajan, Phys. Rev. A 64, 023402 (2001).
J. Fortagh, A. Grossmann, T. W. Hänsch and C. Zimmermann, J. Appl. Phys. 84, 6499 (1998).
M. Meucci, E. Mariotti, P. Bicchi, C. Marinelli and L. Moi, Europhys. Lett. 25, 639 (1994).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yu, H., Choi, M.H., Kim, S.J. et al. Contrasts of electromagnetically-induced transparency in unperturbed and perturbed cold atoms of 87Rb. Journal of the Korean Physical Society 61, 1232–1236 (2012). https://doi.org/10.3938/jkps.61.1232
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.61.1232