Abstract

The group index and its lineshape parameters of a relatively weak double-resonance probe pulse (signal) propagating through an open doubly driven M-type five-level atomic system are analytically formulated. It is shown for the first time, to our knowledge, that the group velocity status of the signal can be altered (between superluminal and subluminal propagation) by the combined effect of atomic coherence and linear AC Stark shift through coherent coupling. The distinct feature in this scheme is that, although it does not rely on electromagnetically induced transparency, a double-switching effect (i.e., from superluminal to subluminal and vice versa) is observed with negligible absorption/gain at two different frequency regimes.

© 2013 Optical Society of America

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  1. S. E. Harris, J. E. Field, and A. Imamoglu, “Nonlinear optical processes using electromagnetically induced transparency,” Phys. Rev. Lett. 64, 1107–1110 (1990).
    [CrossRef]
  2. L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
    [CrossRef]
  3. M. D. Lukin and A. Imamoglu, “Controlling photons with electromagnetically induced transparency,” Nature 413, 273–276 (2001).
    [CrossRef]
  4. X. Yang and Y. Wu, “Achieving an ultra-slowly propagating maximally entangled state of two light beams via four-wave mixing in a double-λ system,” J. Opt. B 7, 54–56 (2005).
    [CrossRef]
  5. Y. Wu and L. Deng, “Ultraslow optical solitons in a cold four-state medium,” Phys. Rev. Lett. 93, 143904 (2004).
    [CrossRef]
  6. D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
    [CrossRef]
  7. M. Fleischhauer and M. D. Lukin, “Dark-state polaritons in electromagnetically induced transparency,” Phys. Rev. Lett. 84, 5094–5097 (2000).
    [CrossRef]
  8. O. Kocharovskaya, Y. Rostovtsev, and M. O. Scully, “Stopping light via hot atoms,” Phys. Rev. Lett. 86, 628–631 (2001).
    [CrossRef]
  9. D. Hughes and N. Hansen, “Graded nanostructures produced by sliding and exhibiting universal behavior,” Phys. Rev. Lett. 87, 135503 (2001).
    [CrossRef]
  10. A. M. Steinberg and R. Y. Chiao, “Dispersionless, highly superluminal propagation in a medium with a gain doublet,” Phys. Rev. A 49, 2071–2075 (1994).
    [CrossRef]
  11. L. J. Wang, A. Kuzmich, and A. Dogariu, “Gain-assisted superluminal light propagation,” Nature 406, 277–279 (2000).
    [CrossRef]
  12. D. Bortman-Arbiv, A. D. Wilson-Gordon, and H. Friedmann, “Phase control of group velocity: from subluminal to superluminal light propagation,” Phys. Rev. A 63, 043818 (2001).
    [CrossRef]
  13. D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
    [CrossRef]
  14. M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
    [CrossRef]
  15. H. Tajalli and M. Sahrai, “Switching from normal to anomalous dispersion via coherent field,” J. Opt. B 7, 168–173 (2005).
    [CrossRef]
  16. G. S. Agarwal and T. N. Dey, “Knob for changing light propagation from subluminal to superluminal,” Phys. Rev. A 64, 053809 (2001).
    [CrossRef]
  17. A. D. Wilson-Gordon and H. Friedmann, “Positive and negative dispersion in a three-level Λ system driven by a single pump,” J. Mod. Opt. 49, 125–139 (2002).
    [CrossRef]
  18. K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
    [CrossRef]
  19. H. Kang, L. Wen, and Y. Zhu, “Normal or anomalous dispersion and gain in a resonant coherent medium,” Phys. Rev. A 68, 063806 (2003).
    [CrossRef]
  20. G. S. Agarwal and S. Dasgupta, “Superluminal propagation via coherent manipulation of the Raman gain process,” Phys. Rev. A 70, 023802 (2004).
    [CrossRef]
  21. L. Deng, E. W. Hagley, M. Kozuma, and M. G. Payne, “Optical-wave group-velocity reduction without electromagnetically induced transparency,” Phys. Rev. A 65, 051805(R) (2002).
    [CrossRef]
  22. S. Stenholm, Foundations of Laser Spectroscopy (Wiley, 1983).
  23. M. O. Scully and M. S. Zubairy, Quantum Optics (Cambridge University, 1997).
  24. J. Miynek and W. Lange, “A simple method of observing coherent ground state transients,” Opt. Commun. 30, 337–340 (1979).
    [CrossRef]
  25. S. Ghosh and S. Mandal, “Analytical studies on pump-induced optical resonances in an M-type six-level system,” J. Phys. B 43, 245505 (2010).
    [CrossRef]
  26. S. Ghosh and S. Mandal, “Double-control coherent absorption and transparency in a six-level optical gain medium,” Phys. Scr. 84, 045405 (2011).
    [CrossRef]

2011

S. Ghosh and S. Mandal, “Double-control coherent absorption and transparency in a six-level optical gain medium,” Phys. Scr. 84, 045405 (2011).
[CrossRef]

2010

S. Ghosh and S. Mandal, “Analytical studies on pump-induced optical resonances in an M-type six-level system,” J. Phys. B 43, 245505 (2010).
[CrossRef]

2007

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

2005

H. Tajalli and M. Sahrai, “Switching from normal to anomalous dispersion via coherent field,” J. Opt. B 7, 168–173 (2005).
[CrossRef]

X. Yang and Y. Wu, “Achieving an ultra-slowly propagating maximally entangled state of two light beams via four-wave mixing in a double-λ system,” J. Opt. B 7, 54–56 (2005).
[CrossRef]

2004

Y. Wu and L. Deng, “Ultraslow optical solitons in a cold four-state medium,” Phys. Rev. Lett. 93, 143904 (2004).
[CrossRef]

M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
[CrossRef]

G. S. Agarwal and S. Dasgupta, “Superluminal propagation via coherent manipulation of the Raman gain process,” Phys. Rev. A 70, 023802 (2004).
[CrossRef]

2003

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

H. Kang, L. Wen, and Y. Zhu, “Normal or anomalous dispersion and gain in a resonant coherent medium,” Phys. Rev. A 68, 063806 (2003).
[CrossRef]

2002

L. Deng, E. W. Hagley, M. Kozuma, and M. G. Payne, “Optical-wave group-velocity reduction without electromagnetically induced transparency,” Phys. Rev. A 65, 051805(R) (2002).
[CrossRef]

A. D. Wilson-Gordon and H. Friedmann, “Positive and negative dispersion in a three-level Λ system driven by a single pump,” J. Mod. Opt. 49, 125–139 (2002).
[CrossRef]

2001

D. Bortman-Arbiv, A. D. Wilson-Gordon, and H. Friedmann, “Phase control of group velocity: from subluminal to superluminal light propagation,” Phys. Rev. A 63, 043818 (2001).
[CrossRef]

G. S. Agarwal and T. N. Dey, “Knob for changing light propagation from subluminal to superluminal,” Phys. Rev. A 64, 053809 (2001).
[CrossRef]

M. D. Lukin and A. Imamoglu, “Controlling photons with electromagnetically induced transparency,” Nature 413, 273–276 (2001).
[CrossRef]

D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
[CrossRef]

O. Kocharovskaya, Y. Rostovtsev, and M. O. Scully, “Stopping light via hot atoms,” Phys. Rev. Lett. 86, 628–631 (2001).
[CrossRef]

D. Hughes and N. Hansen, “Graded nanostructures produced by sliding and exhibiting universal behavior,” Phys. Rev. Lett. 87, 135503 (2001).
[CrossRef]

2000

M. Fleischhauer and M. D. Lukin, “Dark-state polaritons in electromagnetically induced transparency,” Phys. Rev. Lett. 84, 5094–5097 (2000).
[CrossRef]

L. J. Wang, A. Kuzmich, and A. Dogariu, “Gain-assisted superluminal light propagation,” Nature 406, 277–279 (2000).
[CrossRef]

1999

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
[CrossRef]

1994

A. M. Steinberg and R. Y. Chiao, “Dispersionless, highly superluminal propagation in a medium with a gain doublet,” Phys. Rev. A 49, 2071–2075 (1994).
[CrossRef]

1990

S. E. Harris, J. E. Field, and A. Imamoglu, “Nonlinear optical processes using electromagnetically induced transparency,” Phys. Rev. Lett. 64, 1107–1110 (1990).
[CrossRef]

1979

J. Miynek and W. Lange, “A simple method of observing coherent ground state transients,” Opt. Commun. 30, 337–340 (1979).
[CrossRef]

Agarwal, G. S.

G. S. Agarwal and S. Dasgupta, “Superluminal propagation via coherent manipulation of the Raman gain process,” Phys. Rev. A 70, 023802 (2004).
[CrossRef]

G. S. Agarwal and T. N. Dey, “Knob for changing light propagation from subluminal to superluminal,” Phys. Rev. A 64, 053809 (2001).
[CrossRef]

Bai, Y.

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

Behroozi, C. H.

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
[CrossRef]

Bortman-Arbiv, D.

D. Bortman-Arbiv, A. D. Wilson-Gordon, and H. Friedmann, “Phase control of group velocity: from subluminal to superluminal light propagation,” Phys. Rev. A 63, 043818 (2001).
[CrossRef]

Chen, W.

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

Chiao, R. Y.

A. M. Steinberg and R. Y. Chiao, “Dispersionless, highly superluminal propagation in a medium with a gain doublet,” Phys. Rev. A 49, 2071–2075 (1994).
[CrossRef]

Dasgupta, S.

G. S. Agarwal and S. Dasgupta, “Superluminal propagation via coherent manipulation of the Raman gain process,” Phys. Rev. A 70, 023802 (2004).
[CrossRef]

Deng, L.

Y. Wu and L. Deng, “Ultraslow optical solitons in a cold four-state medium,” Phys. Rev. Lett. 93, 143904 (2004).
[CrossRef]

L. Deng, E. W. Hagley, M. Kozuma, and M. G. Payne, “Optical-wave group-velocity reduction without electromagnetically induced transparency,” Phys. Rev. A 65, 051805(R) (2002).
[CrossRef]

Dey, T. N.

G. S. Agarwal and T. N. Dey, “Knob for changing light propagation from subluminal to superluminal,” Phys. Rev. A 64, 053809 (2001).
[CrossRef]

Dogariu, A.

L. J. Wang, A. Kuzmich, and A. Dogariu, “Gain-assisted superluminal light propagation,” Nature 406, 277–279 (2000).
[CrossRef]

Dutton, Z.

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
[CrossRef]

Field, J. E.

S. E. Harris, J. E. Field, and A. Imamoglu, “Nonlinear optical processes using electromagnetically induced transparency,” Phys. Rev. Lett. 64, 1107–1110 (1990).
[CrossRef]

Fleischhauer, A.

D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
[CrossRef]

Fleischhauer, M.

M. Fleischhauer and M. D. Lukin, “Dark-state polaritons in electromagnetically induced transparency,” Phys. Rev. Lett. 84, 5094–5097 (2000).
[CrossRef]

Friedmann, H.

A. D. Wilson-Gordon and H. Friedmann, “Positive and negative dispersion in a three-level Λ system driven by a single pump,” J. Mod. Opt. 49, 125–139 (2002).
[CrossRef]

D. Bortman-Arbiv, A. D. Wilson-Gordon, and H. Friedmann, “Phase control of group velocity: from subluminal to superluminal light propagation,” Phys. Rev. A 63, 043818 (2001).
[CrossRef]

Ghosh, S.

S. Ghosh and S. Mandal, “Double-control coherent absorption and transparency in a six-level optical gain medium,” Phys. Scr. 84, 045405 (2011).
[CrossRef]

S. Ghosh and S. Mandal, “Analytical studies on pump-induced optical resonances in an M-type six-level system,” J. Phys. B 43, 245505 (2010).
[CrossRef]

Hagley, E. W.

L. Deng, E. W. Hagley, M. Kozuma, and M. G. Payne, “Optical-wave group-velocity reduction without electromagnetically induced transparency,” Phys. Rev. A 65, 051805(R) (2002).
[CrossRef]

Han, D.

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

Hansen, N.

D. Hughes and N. Hansen, “Graded nanostructures produced by sliding and exhibiting universal behavior,” Phys. Rev. Lett. 87, 135503 (2001).
[CrossRef]

Harris, S. E.

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
[CrossRef]

S. E. Harris, J. E. Field, and A. Imamoglu, “Nonlinear optical processes using electromagnetically induced transparency,” Phys. Rev. Lett. 64, 1107–1110 (1990).
[CrossRef]

Hau, L. V.

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
[CrossRef]

Hughes, D.

D. Hughes and N. Hansen, “Graded nanostructures produced by sliding and exhibiting universal behavior,” Phys. Rev. Lett. 87, 135503 (2001).
[CrossRef]

Imamoglu, A.

M. D. Lukin and A. Imamoglu, “Controlling photons with electromagnetically induced transparency,” Nature 413, 273–276 (2001).
[CrossRef]

S. E. Harris, J. E. Field, and A. Imamoglu, “Nonlinear optical processes using electromagnetically induced transparency,” Phys. Rev. Lett. 64, 1107–1110 (1990).
[CrossRef]

Kang, H.

H. Kang, L. Wen, and Y. Zhu, “Normal or anomalous dispersion and gain in a resonant coherent medium,” Phys. Rev. A 68, 063806 (2003).
[CrossRef]

Kapale, K. T.

M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
[CrossRef]

Kim, J. B.

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

Kim, K.

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

Kim, S. K.

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

Kocharovskaya, O.

O. Kocharovskaya, Y. Rostovtsev, and M. O. Scully, “Stopping light via hot atoms,” Phys. Rev. Lett. 86, 628–631 (2001).
[CrossRef]

Kozuma, M.

L. Deng, E. W. Hagley, M. Kozuma, and M. G. Payne, “Optical-wave group-velocity reduction without electromagnetically induced transparency,” Phys. Rev. A 65, 051805(R) (2002).
[CrossRef]

Kuzmich, A.

L. J. Wang, A. Kuzmich, and A. Dogariu, “Gain-assisted superluminal light propagation,” Nature 406, 277–279 (2000).
[CrossRef]

Lange, W.

J. Miynek and W. Lange, “A simple method of observing coherent ground state transients,” Opt. Commun. 30, 337–340 (1979).
[CrossRef]

Lee, C.

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

Lu, H.

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

Lukin, M. D.

M. D. Lukin and A. Imamoglu, “Controlling photons with electromagnetically induced transparency,” Nature 413, 273–276 (2001).
[CrossRef]

D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
[CrossRef]

M. Fleischhauer and M. D. Lukin, “Dark-state polaritons in electromagnetically induced transparency,” Phys. Rev. Lett. 84, 5094–5097 (2000).
[CrossRef]

Mair, A.

D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
[CrossRef]

Mandal, S.

S. Ghosh and S. Mandal, “Double-control coherent absorption and transparency in a six-level optical gain medium,” Phys. Scr. 84, 045405 (2011).
[CrossRef]

S. Ghosh and S. Mandal, “Analytical studies on pump-induced optical resonances in an M-type six-level system,” J. Phys. B 43, 245505 (2010).
[CrossRef]

Miynek, J.

J. Miynek and W. Lange, “A simple method of observing coherent ground state transients,” Opt. Commun. 30, 337–340 (1979).
[CrossRef]

Moon, H. S.

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

Payne, M. G.

L. Deng, E. W. Hagley, M. Kozuma, and M. G. Payne, “Optical-wave group-velocity reduction without electromagnetically induced transparency,” Phys. Rev. A 65, 051805(R) (2002).
[CrossRef]

Philips, D. F.

D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
[CrossRef]

Rostovtsev, Y.

O. Kocharovskaya, Y. Rostovtsev, and M. O. Scully, “Stopping light via hot atoms,” Phys. Rev. Lett. 86, 628–631 (2001).
[CrossRef]

Sahrai, M.

H. Tajalli and M. Sahrai, “Switching from normal to anomalous dispersion via coherent field,” J. Opt. B 7, 168–173 (2005).
[CrossRef]

M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
[CrossRef]

Scully, M. O.

O. Kocharovskaya, Y. Rostovtsev, and M. O. Scully, “Stopping light via hot atoms,” Phys. Rev. Lett. 86, 628–631 (2001).
[CrossRef]

M. O. Scully and M. S. Zubairy, Quantum Optics (Cambridge University, 1997).

Steinberg, A. M.

A. M. Steinberg and R. Y. Chiao, “Dispersionless, highly superluminal propagation in a medium with a gain doublet,” Phys. Rev. A 49, 2071–2075 (1994).
[CrossRef]

Stenholm, S.

S. Stenholm, Foundations of Laser Spectroscopy (Wiley, 1983).

Tajalli, H.

H. Tajalli and M. Sahrai, “Switching from normal to anomalous dispersion via coherent field,” J. Opt. B 7, 168–173 (2005).
[CrossRef]

M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
[CrossRef]

Walsworth, R. L.

D. F. Philips, A. Fleischhauer, A. Mair, R. L. Walsworth, and M. D. Lukin, “Storage of light in atomic vapor,” Phys. Rev. Lett. 86, 783–786 (2001).
[CrossRef]

Wang, L. J.

L. J. Wang, A. Kuzmich, and A. Dogariu, “Gain-assisted superluminal light propagation,” Nature 406, 277–279 (2000).
[CrossRef]

Wen, L.

H. Kang, L. Wen, and Y. Zhu, “Normal or anomalous dispersion and gain in a resonant coherent medium,” Phys. Rev. A 68, 063806 (2003).
[CrossRef]

Wilson-Gordon, A. D.

A. D. Wilson-Gordon and H. Friedmann, “Positive and negative dispersion in a three-level Λ system driven by a single pump,” J. Mod. Opt. 49, 125–139 (2002).
[CrossRef]

D. Bortman-Arbiv, A. D. Wilson-Gordon, and H. Friedmann, “Phase control of group velocity: from subluminal to superluminal light propagation,” Phys. Rev. A 63, 043818 (2001).
[CrossRef]

Wu, Y.

X. Yang and Y. Wu, “Achieving an ultra-slowly propagating maximally entangled state of two light beams via four-wave mixing in a double-λ system,” J. Opt. B 7, 54–56 (2005).
[CrossRef]

Y. Wu and L. Deng, “Ultraslow optical solitons in a cold four-state medium,” Phys. Rev. Lett. 93, 143904 (2004).
[CrossRef]

Yang, X.

X. Yang and Y. Wu, “Achieving an ultra-slowly propagating maximally entangled state of two light beams via four-wave mixing in a double-λ system,” J. Opt. B 7, 54–56 (2005).
[CrossRef]

Zeng, Y.

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

Zhu, Y.

H. Kang, L. Wen, and Y. Zhu, “Normal or anomalous dispersion and gain in a resonant coherent medium,” Phys. Rev. A 68, 063806 (2003).
[CrossRef]

Zubairy, M. S.

M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
[CrossRef]

M. O. Scully and M. S. Zubairy, Quantum Optics (Cambridge University, 1997).

J. Mod. Opt.

D. Han, Y. Zeng, Y. Bai, W. Chen, and H. Lu, “Phase effects on group velocity propagation in a V-type system with spontaneously generated coherence,” J. Mod. Opt. 54, 493–500 (2007).
[CrossRef]

A. D. Wilson-Gordon and H. Friedmann, “Positive and negative dispersion in a three-level Λ system driven by a single pump,” J. Mod. Opt. 49, 125–139 (2002).
[CrossRef]

J. Opt. B

X. Yang and Y. Wu, “Achieving an ultra-slowly propagating maximally entangled state of two light beams via four-wave mixing in a double-λ system,” J. Opt. B 7, 54–56 (2005).
[CrossRef]

H. Tajalli and M. Sahrai, “Switching from normal to anomalous dispersion via coherent field,” J. Opt. B 7, 168–173 (2005).
[CrossRef]

J. Phys. B

S. Ghosh and S. Mandal, “Analytical studies on pump-induced optical resonances in an M-type six-level system,” J. Phys. B 43, 245505 (2010).
[CrossRef]

Nature

L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi, “Light speed reduction to 17 metres per second in an ultracold atomic gas,” Nature 397, 594–598 (1999).
[CrossRef]

M. D. Lukin and A. Imamoglu, “Controlling photons with electromagnetically induced transparency,” Nature 413, 273–276 (2001).
[CrossRef]

L. J. Wang, A. Kuzmich, and A. Dogariu, “Gain-assisted superluminal light propagation,” Nature 406, 277–279 (2000).
[CrossRef]

Opt. Commun.

J. Miynek and W. Lange, “A simple method of observing coherent ground state transients,” Opt. Commun. 30, 337–340 (1979).
[CrossRef]

Phys. Rev. A

G. S. Agarwal and T. N. Dey, “Knob for changing light propagation from subluminal to superluminal,” Phys. Rev. A 64, 053809 (2001).
[CrossRef]

D. Bortman-Arbiv, A. D. Wilson-Gordon, and H. Friedmann, “Phase control of group velocity: from subluminal to superluminal light propagation,” Phys. Rev. A 63, 043818 (2001).
[CrossRef]

M. Sahrai, H. Tajalli, K. T. Kapale, and M. S. Zubairy, “Tunable phase control for subluminal to superluminal light propagation,” Phys. Rev. A 70, 023813 (2004).
[CrossRef]

K. Kim, H. S. Moon, C. Lee, S. K. Kim, and J. B. Kim, “Observation of arbitrary group velocities of light from superluminal to subluminal on a single atomic transit line,” Phys. Rev. A 68, 013810 (2003).
[CrossRef]

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