Y. Chen, C. Lin, and I. A. Yu, “Role of degenerate Zeeman levels in electromagnetically induced transparency,” Phys. Rev. A 61, 053805 (2000).

S. E. Harris and L. V. Hau, “Nonlinear optics at low light levels,” Phys. Rev. Lett. 82, 4611–4614 (1999).

J. Kitching and L. Hollberg, “Interference-induced optical gain without inversion in cold, trapped atoms,” Phys. Rev. A 59, 4685–4689 (1999).

S. E. Harris and Y. Yamamoto, “Photon switching by quantum interference,” Phys. Rev. Lett. 81, 3611–3614 (1998).

A. V. Durrant, H. X. Chen, S. A. Hopkins, and J. A. Vaccaro, “Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium,” Opt. Commun. 151, 136–146 (1998).

H. X. Chen, A. V. Durrant, J. P. Marangos, and J. A. Vaccaro, “Observation of transient electromagnetically induced transparency in a rubidium lambda system,” Phys. Rev. A 58, 1545–1548 (1998).

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 (London) 397, 594–598 (1997).

T. Van Der Veldt, J. F. Roch, and Ph. Grangier, “Nonlinear absorption and dispersion in cold ^{87}Rb atoms,” Opt. Commun. 137, 420–426 (1997).

S. A. Hopkins, E. Usadi, H. X. Chen, and A. V. Durrant, “Electromagnetically induced transparency of laser-cooled rubidium atoms in three-level lambda-type systems,” Opt. Commun. 138, 185–192 (1997).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

S. E. Harris, “Electromagnetically induced transparency,” Phys. Today 50, 36–42 (1997), and references therein.

O. Schmidt, R. Wynands, Z. Hussein, and D. Meschede, “Steep dispersion and group velocity below c/3000 in coherent population trapping,” Phys. Rev. A 53, R27–R30 (1996).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

H. Schmidt and A. Imamoglu, “Giant Kerr nonlinearities obtained by electromagnetically induced transparency,” Opt. Lett. 21, 1936–1938 (1996).

J. Gea-Banacloche, Y. Li, S. Jin, and M. Xiao, “Electromagnetically induced transparency in ladder-type inhomogeneously broadened medium: theory and experiment,” Phys. Rev. A 51, 576–584 (1995).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

M. O. Scully and M. Fleischhauer, “Lasers without inversion,” Science 263, 337–338 (1994).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

K. Lindquist, M. Stephens, and C. Wieman, “Experimental and theoretical study of the vapor-cell Zeeman optical trap,” Phys. Rev. A 46, 4082–4090 (1992).

O. Kocharovskaya, “Amplification and lasing without inversion,” Phys. Rep. 219, 175–190 (1992).

M. O. Scully, “From lasers and masers to phaseonium and phasers,” Phys. Rep. 219, 191–201 (1992).

K. J. Boller, A. Imamoglu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

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 (London) 397, 594–598 (1997).

K. J. Boller, A. Imamoglu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

H. X. Chen, A. V. Durrant, J. P. Marangos, and J. A. Vaccaro, “Observation of transient electromagnetically induced transparency in a rubidium lambda system,” Phys. Rev. A 58, 1545–1548 (1998).

A. V. Durrant, H. X. Chen, S. A. Hopkins, and J. A. Vaccaro, “Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium,” Opt. Commun. 151, 136–146 (1998).

S. A. Hopkins, E. Usadi, H. X. Chen, and A. V. Durrant, “Electromagnetically induced transparency of laser-cooled rubidium atoms in three-level lambda-type systems,” Opt. Commun. 138, 185–192 (1997).

Y. Chen, C. Lin, and I. A. Yu, “Role of degenerate Zeeman levels in electromagnetically induced transparency,” Phys. Rev. A 61, 053805 (2000).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

A. V. Durrant, H. X. Chen, S. A. Hopkins, and J. A. Vaccaro, “Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium,” Opt. Commun. 151, 136–146 (1998).

H. X. Chen, A. V. Durrant, J. P. Marangos, and J. A. Vaccaro, “Observation of transient electromagnetically induced transparency in a rubidium lambda system,” Phys. Rev. A 58, 1545–1548 (1998).

S. A. Hopkins, E. Usadi, H. X. Chen, and A. V. Durrant, “Electromagnetically induced transparency of laser-cooled rubidium atoms in three-level lambda-type systems,” Opt. Commun. 138, 185–192 (1997).

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 (London) 397, 594–598 (1997).

M. O. Scully and M. Fleischhauer, “Lasers without inversion,” Science 263, 337–338 (1994).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

J. Gea-Banacloche, Y. Li, S. Jin, and M. Xiao, “Electromagnetically induced transparency in ladder-type inhomogeneously broadened medium: theory and experiment,” Phys. Rev. A 51, 576–584 (1995).

T. Van Der Veldt, J. F. Roch, and Ph. Grangier, “Nonlinear absorption and dispersion in cold ^{87}Rb atoms,” Opt. Commun. 137, 420–426 (1997).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

S. E. Harris and L. V. Hau, “Nonlinear optics at low light levels,” Phys. Rev. Lett. 82, 4611–4614 (1999).

S. E. Harris and Y. Yamamoto, “Photon switching by quantum interference,” Phys. Rev. Lett. 81, 3611–3614 (1998).

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 (London) 397, 594–598 (1997).

S. E. Harris, “Electromagnetically induced transparency,” Phys. Today 50, 36–42 (1997), and references therein.

K. J. Boller, A. Imamoglu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).

S. E. Harris and L. V. Hau, “Nonlinear optics at low light levels,” Phys. Rev. Lett. 82, 4611–4614 (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 (London) 397, 594–598 (1997).

J. Kitching and L. Hollberg, “Interference-induced optical gain without inversion in cold, trapped atoms,” Phys. Rev. A 59, 4685–4689 (1999).

A. V. Durrant, H. X. Chen, S. A. Hopkins, and J. A. Vaccaro, “Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium,” Opt. Commun. 151, 136–146 (1998).

S. A. Hopkins, E. Usadi, H. X. Chen, and A. V. Durrant, “Electromagnetically induced transparency of laser-cooled rubidium atoms in three-level lambda-type systems,” Opt. Commun. 138, 185–192 (1997).

O. Schmidt, R. Wynands, Z. Hussein, and D. Meschede, “Steep dispersion and group velocity below c/3000 in coherent population trapping,” Phys. Rev. A 53, R27–R30 (1996).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

J. Gea-Banacloche, Y. Li, S. Jin, and M. Xiao, “Electromagnetically induced transparency in ladder-type inhomogeneously broadened medium: theory and experiment,” Phys. Rev. A 51, 576–584 (1995).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

J. Kitching and L. Hollberg, “Interference-induced optical gain without inversion in cold, trapped atoms,” Phys. Rev. A 59, 4685–4689 (1999).

O. Kocharovskaya, “Amplification and lasing without inversion,” Phys. Rep. 219, 175–190 (1992).

J. Gea-Banacloche, Y. Li, S. Jin, and M. Xiao, “Electromagnetically induced transparency in ladder-type inhomogeneously broadened medium: theory and experiment,” Phys. Rev. A 51, 576–584 (1995).

Y. Chen, C. Lin, and I. A. Yu, “Role of degenerate Zeeman levels in electromagnetically induced transparency,” Phys. Rev. A 61, 053805 (2000).

K. Lindquist, M. Stephens, and C. Wieman, “Experimental and theoretical study of the vapor-cell Zeeman optical trap,” Phys. Rev. A 46, 4082–4090 (1992).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

H. X. Chen, A. V. Durrant, J. P. Marangos, and J. A. Vaccaro, “Observation of transient electromagnetically induced transparency in a rubidium lambda system,” Phys. Rev. A 58, 1545–1548 (1998).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

O. Schmidt, R. Wynands, Z. Hussein, and D. Meschede, “Steep dispersion and group velocity below c/3000 in coherent population trapping,” Phys. Rev. A 53, R27–R30 (1996).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

T. Van Der Veldt, J. F. Roch, and Ph. Grangier, “Nonlinear absorption and dispersion in cold ^{87}Rb atoms,” Opt. Commun. 137, 420–426 (1997).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

O. Schmidt, R. Wynands, Z. Hussein, and D. Meschede, “Steep dispersion and group velocity below c/3000 in coherent population trapping,” Phys. Rev. A 53, R27–R30 (1996).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

M. O. Scully and M. Fleischhauer, “Lasers without inversion,” Science 263, 337–338 (1994).

M. O. Scully, “From lasers and masers to phaseonium and phasers,” Phys. Rep. 219, 191–201 (1992).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

K. Lindquist, M. Stephens, and C. Wieman, “Experimental and theoretical study of the vapor-cell Zeeman optical trap,” Phys. Rev. A 46, 4082–4090 (1992).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

S. A. Hopkins, E. Usadi, H. X. Chen, and A. V. Durrant, “Electromagnetically induced transparency of laser-cooled rubidium atoms in three-level lambda-type systems,” Opt. Commun. 138, 185–192 (1997).

A. V. Durrant, H. X. Chen, S. A. Hopkins, and J. A. Vaccaro, “Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium,” Opt. Commun. 151, 136–146 (1998).

H. X. Chen, A. V. Durrant, J. P. Marangos, and J. A. Vaccaro, “Observation of transient electromagnetically induced transparency in a rubidium lambda system,” Phys. Rev. A 58, 1545–1548 (1998).

T. Van Der Veldt, J. F. Roch, and Ph. Grangier, “Nonlinear absorption and dispersion in cold ^{87}Rb atoms,” Opt. Commun. 137, 420–426 (1997).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

K. Lindquist, M. Stephens, and C. Wieman, “Experimental and theoretical study of the vapor-cell Zeeman optical trap,” Phys. Rev. A 46, 4082–4090 (1992).

O. Schmidt, R. Wynands, Z. Hussein, and D. Meschede, “Steep dispersion and group velocity below c/3000 in coherent population trapping,” Phys. Rev. A 53, R27–R30 (1996).

J. Gea-Banacloche, Y. Li, S. Jin, and M. Xiao, “Electromagnetically induced transparency in ladder-type inhomogeneously broadened medium: theory and experiment,” Phys. Rev. A 51, 576–584 (1995).

S. E. Harris and Y. Yamamoto, “Photon switching by quantum interference,” Phys. Rev. Lett. 81, 3611–3614 (1998).

Y. Chen, C. Lin, and I. A. Yu, “Role of degenerate Zeeman levels in electromagnetically induced transparency,” Phys. Rev. A 61, 053805 (2000).

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 (London) 397, 594–598 (1997).

T. Van Der Veldt, J. F. Roch, and Ph. Grangier, “Nonlinear absorption and dispersion in cold ^{87}Rb atoms,” Opt. Commun. 137, 420–426 (1997).

S. A. Hopkins, E. Usadi, H. X. Chen, and A. V. Durrant, “Electromagnetically induced transparency of laser-cooled rubidium atoms in three-level lambda-type systems,” Opt. Commun. 138, 185–192 (1997).

A. V. Durrant, H. X. Chen, S. A. Hopkins, and J. A. Vaccaro, “Zeeman-coherence-induced transparency and gain without inversion in laser-cooled rubidium,” Opt. Commun. 151, 136–146 (1998).

O. Kocharovskaya, “Amplification and lasing without inversion,” Phys. Rep. 219, 175–190 (1992).

M. O. Scully, “From lasers and masers to phaseonium and phasers,” Phys. Rep. 219, 191–201 (1992).

J. Gea-Banacloche, Y. Li, S. Jin, and M. Xiao, “Electromagnetically induced transparency in ladder-type inhomogeneously broadened medium: theory and experiment,” Phys. Rev. A 51, 576–584 (1995).

D. J. Fulton, S. Shepherd, R. R. Moseley, B. D. Sinclair, and M. H. Dunn, “Continuous-wave electromagnetically in-duced transparency: a comparison of V, Λ, and cascade systems,” Phys. Rev. A 52, 2302–2311 (1995).

O. Schmidt, R. Wynands, Z. Hussein, and D. Meschede, “Steep dispersion and group velocity below c/3000 in coherent population trapping,” Phys. Rev. A 53, R27–R30 (1996).

H. X. Chen, A. V. Durrant, J. P. Marangos, and J. A. Vaccaro, “Observation of transient electromagnetically induced transparency in a rubidium lambda system,” Phys. Rev. A 58, 1545–1548 (1998).

Y. Chen, C. Lin, and I. A. Yu, “Role of degenerate Zeeman levels in electromagnetically induced transparency,” Phys. Rev. A 61, 053805 (2000).

F. S. Cataliotti, C. Fort, T. W. Hansch, M. Inguscio, and M. Prevedelli, “Electromagnetically induced transparency in cold free atoms: test of a sum rule for nonlinear optics,” Phys. Rev. A 56, 2221–2224 (1997).

J. Kitching and L. Hollberg, “Interference-induced optical gain without inversion in cold, trapped atoms,” Phys. Rev. A 59, 4685–4689 (1999).

K. Lindquist, M. Stephens, and C. Wieman, “Experimental and theoretical study of the vapor-cell Zeeman optical trap,” Phys. Rev. A 46, 4082–4090 (1992).

W. Ketterle, K. B. Davis, M. A. Joffe, A. Martin, and D. E. Pritchard, “High densities of cold atoms in a dark spontaneous force,” Phys. Rev. Lett. 70, 2253–2254 (1993).

S. E. Harris and Y. Yamamoto, “Photon switching by quantum interference,” Phys. Rev. Lett. 81, 3611–3614 (1998).

G. G. Padmabandu, G. R. Welch, Z. N. Smith, E. S. Fry, D. E. Nikonov, M. D. Lukin, and M. O. Scully, “Laser oscillation without population inversion in a sodium atomic beam,” Phys. Rev. Lett. 76, 2053–2054 (1996).

K. J. Boller, A. Imamoglu, and S. E. Harris, “Observation of electromagnetically induced transparency,” Phys. Rev. Lett. 66, 2593–2596 (1991).

S. E. Harris and L. V. Hau, “Nonlinear optics at low light levels,” Phys. Rev. Lett. 82, 4611–4614 (1999).

S. E. Harris, “Electromagnetically induced transparency,” Phys. Today 50, 36–42 (1997), and references therein.

M. O. Scully and M. Fleischhauer, “Lasers without inversion,” Science 263, 337–338 (1994).

T. Hansch, R. Keil, A. Schabert, C. Schemelzer, and P. Toscheck, “Interaction of laser light waves by dynamic Stark splitting,” Z. Phys. 226, 293–296 (1969).

P. Meystre and M. Sargent III, Elements of Quantum Optics (Springer-Verlag, New York, 1990).

E. Arimondo, in Progress in Optics, E. Wolf, ed. (Elsevier, Amsterdam, 1996), pp. 257–354, and references therein.

C. Cohen-Tannoudji, in Frontiers in Laser Spectroscopy, Les Houches Session XXVII, R. Balian, S. Haroche, and S. Liberman, eds. (North-Holland, Amsterdam, 1977), pp. 1–104.