A. C. Turner-Foster, M. A. Foster, J S. Levy, C. B. Poitras, R. Salem, A. L. Gaeta, and M. Lipson,
"Ultrashort free-carrier lifetime in low-loss silicon nanowaveguides,"
Opt. Express 18, 3582-3591 (2010). PDF

A. C. Turner-Foster, M. A. Foster, R. Salem, A. L. Gaeta, and M. Lipson,
"Frequency conversion over two-thirds of an octave in silicon nanowaveguides,"
Opt. Express 18, 1904-1908 (2010). PDF

Y. Dai, Y. Okawachi, A. C. Turner-Foster, M. Lipson, A. L. Gaeta, and C. Xu,
"Ultralong continuously tunable parametric delays via a cascading discrete stage,"
Opt. Express 18, 333-339 (2010). PDF

J. S. Levy, A. Gondarenko, M. A. Foster, A. C. Turner-Foster, A. L. Gaeta, and M. Lipson,
"CMOS-compatible multiple-wavelength oscillator for on-chip optical interconnects,"
Nature Photonics 4, 37-40 (2009). PDF

M. A. Foster, R. Salem, D. F. Geraghty, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta,
"Ultrafast measurements using a silicon-chip-based temporal lens,"
Optics in 2009 in Optics and Photonics News, 20, 40 (2009). PDF

O. Kuzucu, Y. Okawachi, R. Salem, M. A. Foster, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta,
"Spectral phase conjugation via temporal imaging,"
Opt. Express 17, 20605-20614 (2009). PDF

A. A. Ishaaya, C. J. Hensley, B. Shim, S. Schrauth, K. W. Koch, and A. L. Gaeta,
"Highly-efficient coupling of linearly- and radially-polarized femtosecond pulses in hollow-core photonic band-gap fibers,"
Opt. Express 17, 18630-18637 (2009). PDF

M. A. Foster, R. Salem, Y. Okawachi, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta,
"Ultrafast waveform compression using a time-domain telescope,"
Nature Photonics 3, 581-585 (2009). PDF

I. H. Agha, Y. Okawachi, and A. L. Gaeta,
"Theoretical and experimental investigation of broadband casceded four-wave mixing in high-Q microspheres,"
Opt. Express 17, 16209-16215 (2009). PDF

Y. Dai, X. Chen, Y. Okawachi, A. C. Turner-Foster, M. A. Foster, M. Lipson, A. L. Gaeta, and C. Xu,
"1 μs tunable delay using parametric mixing and optical phase conjugation in Si waveguides: reply,"
Opt. Express 17, 16029-16031 (2009). PDF

P. Londero, V. Venkataraman, A.R. Bhagwat, A. D. Slepkov, and A. L. Gaeta,
"Ultralow-power four-wave mixing with Rb in a hollow-core photonic band-gap fiber,"
Phys. Rev. Lett. 103, 043602 (2009). PDF

A.R. Bhagwat, A. D. Slepkov, V. Venkataraman, P. Londero, and A. L. Gaeta,
"On-demand all-optical generation of controlled Rb-vapor densities in photonic-band-gap fibers,"
Phys. Rev. A 79, 063809 (2009). PDF

Y. Dai, X. Chen, Y. Okawachi, A. C. Turner-Foster, M. A. Foster, M. Lipson, A. L. Gaeta, and C. Xu,
"1 μs tunable delay using parametric mixing and optical phase conjugation in Si waveguides,"
Opt. Express 17, 7004-7010 (2009). PDF

D. H. Broaddus, M. A. Foster, I. H. Agha, J. T. Robinson, M. Lipson, and A. L. Gaeta,
"Silicon-waveguide-coupled high-Q chalcogenide microspheres,"
Opt. Express 17, 5998-6003 (2009). PDF

Y. Okawachi, R. Salem, M. A. Foster, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta,
"High-resolution spectroscopy using a frequency magnifier,"
Opt. Express 17, 5691-5697 (2009). PDF

R. Salem, M. A. Foster, A. C. Turner-Foster, D. F. Geraghty, M. Lipson, and A. L. Gaeta,
"High-speed optical sampling using a silicon-chip temporal magnifier,"
Opt. Express 17, 4324-4329 (2009). PDF

B. G. Lee, A. Biberman, A. C. Turner-Foster, M. A. Foster, M. Lipson, A. L. Gaeta, and K. Bergman,
"Demonstration of broadband wavelength conversion at 40 Gb/s in silicon waveguides,"
Photon. Technol. Lett. 21, 182-184 (2009). PDF

J. D. Marconi, Arismar Cergueira S. Jr., J. T. Robinson, N. Sherwood-Droz, Y. Okawachi, H. E. Hernandez-Figueroa, M. Lipson, A. L. Gaeta and H. L. Fragnito,
"Performance investigation of microphotonic-silicon devices in a field-trial all-optical network,"
Opt. Comm. 282, 849-855 (2009). PDF

G. M. Gehring, R. W. Boyd, A. L. Gaeta, D. J. Gauthier, and A. E. Willner,
"Fiber-based slow-light technologies,"
J. Lightwave Technol. 26, 3752-3762 (2008). PDF

A. D. Slepkov, A. R. Bhagwat, V. Venkataraman, P. Londero, and A. L. Gaeta,
"Generation of large alkali vapor densities inside bare hollow-core photonic band-gap fibers,"
Opt. Express 16, 18976-18983 (2008). PDF

M. A. Foster, R. Salem, D. F. Geraghty, A. C. Turner-Foster, M. Lipson, and A. L. Gaeta,
"Silicon-chip-based ultrafast optical oscilloscope,"
Nature 456, 81-84 (2008). PDF

J. E. Sharping, J. R. Sanborn, M. A. Foster, D. Broaddus, and A. L. Gaeta,
"Generation of sub-100-fs pulses from a microstructure-fiber-based optical parametric oscillator,"
Opt. Express 16, 18050-18056 (2008). PDF

N. Gavish, G. Fibich, L. T. Vuong, and A. L. Gaeta,
"Predicting the filamentation of high-power beams and pulses without numerical integration: A nonlinear geometrical optics method,"
Phys. Rev. A 78, 043807 (2008). PDF

Y. Okawachi, M. A. Foster, X. Chen, A. C. Turner-Foster, R. Salem, M. Lipson, C. Xu, and A. L. Gaeta,
"Large tunable delays using parametric mixing and phase conjugation in Si nanowaveguides,"
Opt. Express 16, 10349-10357 (2008). PDF

R. Salem, M. A. Foster, A. C. Turner, D. F. Geraghty, M. Lipson, and A. L. Gaeta,
"Optical time lens based on four-wave mixing on a silicon chip,"
Opt. Lett. 33, 1047-1049 (2008). PDF

D. F. Geraghty, R. Salem, M. A. Foster, and A. L. Gaeta,
"A Simplified Optical Correlation and its Application to Packet-Header Recognition,"
Photon. Tech. Lett. 20, 487-489 (2008). PDF

Z. Zhong, N. M. Gabor, J. E. Sharping, A. L. Gaeta, and P. L. McEuen,
"Terahertz time-domain measurement of ballistic electron resonance in a single-walled carbon nanotube,"
Nature Nanotechnology. 3, 201-205 (2008). PDF

A. C. Turner, M. A. Foster, A. L. Gaeta, and M. Lipson,
"Ultra-low power parametric frequency conversion in a silicon microring resonator,"
Opt. Express 16, 4881-4887 (2008). PDF

A. R. Bhagwat and A. L. Gaeta,
"Nonlinear optics in hollow-core photonic bandgap fibers,"
Opt. Express 16, 1535-1547 (2008). PDF

M. A. Foster, A. C. Turner, M. Lipson, and A. L. Gaeta,
"Nonlinear optics in photonic nanowires,"
Opt. Express 16, 1300-1320 (2008). PDF

L. T. Vuong, R. B. Lopez-Martens, C. P. Hauri, and A. L. Gaeta,
"Spectral reshaping and pulse compression via sequential filamentation in gases,"
Opt. Express 16, 390-401 (2008). PDF

A. A. Ishaaya, L. T. Vuong, T. D. Grow, and A. L. Gaeta,
"Self-focusing dynamics of polarization vortices in Kerr media,"
Opt. Lett. 33, 13-15 (2008). PDF

R. Salem, M. A. Foster, A. C. Turner, D. F. Geraghty, M. Lipson, and A. L. Gaeta,
"Signal regeneration using low-power four-wave mixing on silicon chip,"
Nature Photonics 2, 35-38 (2008). PDF

K. F. Lee, P. Kumar, J. E. Sharping, M. A. Foster, A. L. Gaeta, A. C. Turner-Foster, and M. Lipson,
"Telecom-band entanglement generation for chipscale quantum processing,"
arXiv:0801.2606. PDF

Y. Okawachi, R. Salem, and A. L. Gaeta,
"Continuous Tunable Delays at 10-Gb/s Data Rates Using Self-Phase Modulation and Dispersion,"
J. Lightwave Technol. 25, 3710-3715 (2007). PDF

I. H. Agha, Y. Okawachi, M. A. Foster, J. E. Sharping, and A. L. Gaeta,
"Four-wave-mixing parametric oscillations in dispersion-compensated high-Q optical microspheres,"
Phys. Rev. A 76, 043837 (2007). PDF

M. A. Foster, A. C. Turner, R. Salem, M. Lipson, and A. L. Gaeta,
"Broad-band continous-wave parametric wavelength conversion in silicon nanowaveguides,"
Opt. Express 15, 12949-12958 (2007). PDF

Y. Okawachi, A. D. Slepkov, I. H. Agha, D. F. Geraghty, and A. L. Gaeta,
"Absorption of ultrashort optical pulses in water,"
J. Opt. Soc. Am. A, 24, 3343 (2007). PDF

T. D. Grow, A. A. Ishaaya, L. T. Vuong, and A. L. Gaeta,
"Collapse and stability of necklace beams in Kerr Media,"
Phys. Rev. Lett. 99, 133902 (2007). PDF

R. Salem, M. A. Foster, A. C. Turner, D. F. Geraghty, M. Lipson, and A. L. Gaeta,
"All-optical regeneration on a silicon chip,"
Opt. Express 15, 7802-7809 (2007). PDF

Y. Wang, C. Yu, L. Yan, A. E. Willner, R. Roussev, C. Langrock,
M. M. Fejer, J. E. Sharping, and A. L. Gaeta,
"44-ns Continuously Tunable Dispersionless Optical Delay Element Using a PPLN Waveguide
With Two-Pump Configuration, DCF, and a Dispersion Compensator,"
IEEE Photon. Technol. Lett. 19, 861-863 (2007). PDF

C. J. Hensley, D. H. Broaddus, C. B. Schaffer, and A. L. Gaeta,
"Photonic band-gap fiber gas cell fabricated using femtosecond micromachining,"
Opt. Express 15, 6690-6695 (2007). PDF

A. L. Gaeta,
"Slow light: Putting the brakes on images,"
Nature Photonics 1, 140-141 (2007). PDF

C. J. Hensley, D. G. Ouzounov, A. L. Gaeta, N. Venkataraman, M. T. Gallagher, and K. W. Koch,
"Silica-glass contribution to the effective nonlinearity of hollow-core photonic band-gap fibers,"
Opt. Express 15, 3507-3512 (2007). PDF

A. A. Ishaaya, T. D. Grow, S. Ghosh, L. T. Vuong, and A. L. Gaeta,
"Self-focusing dynamics of coupled optical beams,"
Phys. Rev. A 75, 023813 (2007). PDF

J. E. Sharping, M. A. Foster, A. L. Gaeta, J. Lasri, O. Lyngnes, and K. Vogel,
"Octave-spanning, high-power microstructure-fiber-based optical parametric oscillators,"
Opt. Express 15, 1474-1479 (2007). PDF

Y. Okawachi, J. E. Sharping, C. Xu, and A. L. Gaeta,
"Large tunable optical delays via self-phase modulation and dispersion,"
Opt. Express 14, 12022-12027 (2006). PDF

J. E. Sharping, K. F. Lee, M. A. Foster, A. C. Turner, B. S. Schmidt,
M. Lipson, A. L. Gaeta, and P. Kumar,
"Generation of correlated photons in nanoscale silicon waveguides,"
Opt. Express 14, 12388-12393 (2006). PDF

S. Ghosh, A. R. Bhagwat, C. K. Renshaw, S. Goh, A. L. Gaeta, and B. J. Kirby,
"Low-Light-Level Optical Interactions with Rubidium Vapor in a Photonic Band-Gap Fiber,"
Phys. Rev. Lett. 97, 023603 (2006). PDF

M. A. Foster, A. C. Turner, J. E. Sharping, B. S. Schmidt, M. Lipson, and A. L. Gaeta,
"Broad-band optical parametric gain on a silicon photonic chip,"
Nature 441, 960-963 (2006). PDF

T. D. Grow, A. Ishaaya, L. T. Vuong, A. L. Gaeta, N. Gavish, and G. Fibich,
"Collapse dynamics of super-Gaussian Beams,"
Opt. Express 14, 5468-5475 (2006). PDF

A. C. Turner, C. Manolatou, B. S. Schmidt, M. Lipson, M. A. Foster, J. E. Sharping, and A. L. Gaeta,
"Tailored anomalous group-velocity dispersion in silicon channel waveguides,"
Opt. Express 14, 4357-4362 (2006). PDF

R. W. Boyd, D. G. Gauthier, and A. L. Gaeta,
"Applications of Slow Light in Telecommunications"
Optic. Photon. News 17, 18-22 (2006). PDF

I. H. Agha, J. E. Sharping, M. A. Foster, A. L. Gaeta
"Optimal sizes of silica microspheres for linear and nonlinear optical interactions,"
Appl. Phys. B 83, 303-309 (2006). PDF

L. T. Vuong, T. D. Grow, A. Ishaaya, A. L. Gaeta, G. W. ’t Hooft, E. R. Eliel, and G. Fibich,
"Collapse of Optical Vortices"
Phys. Rev. Lett. 96, 133901 (2006). PDF

Y. Okawachi, M. A. Foster, J. E. Sharping, A. L. Gaeta, Q. Xu, and M. Lipson,
"All-optical slow-light on a photonic chip,"
Opt. Express 14, 2317-2322 (2006). PDF

Z. Zhu, D. J. Gauthier, Y. Okawachi, J. E. Sharping, A. L. Gaeta, R. W. Boyd, and A. E. Willner,
"Numerical study of all-optical slow-light delays via stimulated Brillouin scattering in an optical fiber,"
J. Opt. Soc. Am. B 22, 2378 (2005). PDF

J. E. Sharping, Y. Okawachi, J. van Howe, C. Xu, Y. Wang, A. E. Willner, and A. L. Gaeta,
"All-optical, wavelength and bandwidth preserving, pulse delay based on parametric wavelength
conversion and dispersion,"
Opt. Express 13, 7872-7877 (2005). PDF

M. A. Foster, A. L. Gaeta, Q. Cao, and R. Trebino,
"Soliton-effect compression of supercontinuum to few-cycle durations in photonic nanowires,"
Opt. Express 13 6848-6855 (2005). PDF

D. G. Ouzounov, C. J. Hensley, A. L. Gaeta, N. Venkataraman, M. Gallagher, and K. W. Koch,
"Soliton pulse compression in photonic band-gap fibers,"
Opt. Express 13 6153-6159 (2005). PDF

J. E. Sharping, Y. Okawachi, and A. L. Gaeta,
"Wide bandwidth slow light using a Raman fiber amplifier,"
Opt. Express 13 6092-6098 (2005). PDF

G. Fibich, S. Eisenmann, B. Ilan, Y. Erlich, M. Fraenkel, Z. Henis, A. L. Gaeta, and A. Zigler,
"Self-focusing distances of very high power laser pulses,"
Opt. Express 13 5897-5903 (2005). PDF

M. A. Foster, J. M. Dudley, B. Kibler, Q. Cao, D. Lee, R. Trebino, and A. L. Gaeta,
"Nonlinear pulse propagation and supercontinuum generation in photonic
nanowires: experiment and simulation,"
Appl. Phys. B 81, 363-367 (2005). PDF

D. Homoelle, K. D. Moll, A. L. Gaeta, and R. W. Boyd,
"Conical three-photon-excited stimulated hyper-Raman scattering,"
Phys. Rev. A 72, 011802 (2005). PDF

T. D. Grow and A. L. Gaeta,
"Dependence of multiple filamentation on beam ellipticity,"
Opt. Express 13 4594-4599 (2005). PDF

Y. Okawachi, M. S. Bigelow, J. E. Sharping, Z. M. Zhu, A. Schweinsberg, D. J. Gauthier,
R. W. Boyd, and A. L. Gaeta,
"Tunable all-optical delays via Brillouin slow light in an optical fiber,"
Phys. Rev. Lett. 94, 153902 (2005). PDF

S. Ghosh, J. E. Sharping, D. G. Ouzounov, and A. L. Gaeta,
"Resonant Optical Interactions with Molecules Confined in Photonic Band-Gap Fibers,"
Phys. Rev. Lett. 94, 093902 (2005). PDF

R. W. Boyd, D. J. Gauthier, A. L. Gaeta, and A. E. Wilner,
"Maximum time delay achievable on propagation through a slow-light medium,"
Phys. Rev. A 71 023801 (2005). PDF

A. L. Gaeta,
"Collapsing light really shines,"
Science (Perspective) 301, 54 (2003). PDF

J. N. Ames, S. Ghosh, R. S. Windeler, A. L. Gaeta, and S. T. Cundiff,
"Excess noise generation during spectral broadening in microstructure fiber,"
Appl. Phys. B 77, 279 (2003). PDF

D. G. Ouzounov, F. R. Ahmad, A. L. Gaeta, D. Muller, N. Venkataraman, M. Gallagher,
C. M. Smith, and K. W. Koch,
"Generation of megawatt solitons in hollow-core photonic band-gap fibers",
Science 301, 1702 (2003). PDF

K. D. Moll, A. L. Gaeta, and G. Fibich,
"Self-similar optical wave collapse: observation of the Townes profile,"
Phys. Rev. Lett. 90, 203902 (2003). PDF

D. Homoelle, A. L. Gaeta, V. Yanovsky, and G. Mourou,
"Pulse contrast enhancement of high-energy pulses by use of a gas-filled hollow waveguide,"
Opt. Lett. 27, 1646 (2002). PDF

A. L. Gaeta,
"Nonlinear propagation and continuum generation in microstructured optical fibers,"
Opt. Lett. 27, 924 (2002). PDF

K. D. Moll, D. Homoelle, A. L. Gaeta, and R. W. Boyd,
"Conical Harmonic Generation in Isotropic Materials,"
Phys. Rev. Lett. 88, 153901 (2002). PDF

D. G. Ouzounov, K. D. Moll, M. A. Foster, W.R. Zipfel, W.W. Webb and A.L. Gaeta,
"Delivery of nanojoule femtosecond pulses through large-core microstructured fibers,"
Opt. Lett. 27, 1513-1515 (2002). PDF

D. G. Ouzounov, D. Homoelle, W. Zipfel, W. W. Webb, A. L. Gaeta, J. A. West,
J. C. Fajurdo, K. W. Koch,
"Dispersion measurements of microstructured fibers using femtosecond laser pulses,"
Opt. Comm. 192 (2001). PDF

A. L. Gaeta,
"Catastrophic collapse of ultrashort pulses,"
Phys. Rev. Lett. 84, 3582 (2000). PDF

G. Fibich and A. L. Gaeta,
"On the critical power for self-focusing in bulk media and in hollow waveguides,"
Opt. Lett. 25, 335 (2000). PDF

D. Homoelle and A. L. Gaeta,
"Propagation dynamics of ultrashort pulses in hollow waveguides,"
Opt. Lett. 25, 761 (2000). PDF

M. R. Fewings and A. L. Gaeta,
"Compensation of pulse disotortions by phase conjugation via difference-frequency generation,"
J. Opt. Soc. Am. B, 17, 1522 (2000). PDF

M. Y. Lanzerotti, R. W. Schirmer, A. L. Gaeta, G. S. Agarwal,
"Measurements of quantum noise in optical phase conjugation via four-wave
mixing in an atomic vapor,"
Phys. Rev. A, 60, 4980 (1999). PDF

A. Streltsov, K. D. Moll, A. L. Gaeta, P. Kung, D. Walker, M. Razeghi,
"Pulse autocorrelation measurements based on two- and three-photon conductivity
in a GaN photodiode,"
Appl. Phys. Lett. 75, 3778 (1999). PDF

D. Homoelle, S. Wielandy, A. L. Gaeta, N. Borrelli, C. Smith,
"Infrared photosensitivity in silica glasses exposed to femtosecond laser pulses,"
Opt. Lett. 24, 1311 (1999). PDF

S. Wielandy and A. L. Gaeta,
"Coherent control of the polarization of an optical field,"
Phys. Rev. Lett. 81, 3359 (1998). PDF

S. Wielandy and A. L. Gaeta,
"Investigation of electromagnetically induced transparency in the strong probe regime,"
Phys. Rev. A 58, 2500 (1998). PDF

A. M. Streltsov, J. K. Ranka and A. L. Gaeta,
"Femtosecond ultraviolet autocorrelation measurements based on two-photon
conductivity in fused silica,"
Opt. Lett. 23, 798 (1998). PDF

J. K. Ranka and A. L. Gaeta,
"Breakdown of the slowly-varying envelope approximation in the self-focusing of ultrashort pulses,"
Opt. Lett. 23, 534, (1998). PDF

J. K. Ranka, R. W. Schirmer, and A. L. Gaeta,
"Coherent spectroscopic effects in the propagation of ultrashort pulses through a two-level system,"
Phys. Rev. A (Rapid Communication) 57, R36 (1998). PDF

J. K. Ranka, A. L. Gaeta, A. Baltsuka, M. A. Pshenichnikov, and D. A. Wiersma,
"Ultrashort pulse autocorrelator,"
Optics in 1997 in Optics and Photonics News, 8, 49 (1997). PDF

J. K. Ranka, A. L. Gaeta, A. Baltsuka, M. S .Pshenichnikov, and D. A. Wiersma,
"Autocorrelation measurement of 6-fs pulses based on the two-photon-induced
photocurrent in a GaAsP photodiode,"
Opt. Lett. 22, 1344 (1997). PDF

R. W. Schirmer and A. L. Gaeta,
"Nonlinear mirror based on two-photon absorption,"
J. Opt. Soc. Am. B 14, 2865 (1997). PDF

R. W. Schirmer, M. Y. Lanzerotti, A. L. Gaeta, and G. S. Agarwal,
"Quantum theory of noise in phase conjugation by four-wave mixing in a two-level system,"
Phys. Rev. A 55, 3155 (1997). PDF

T. Kajava and A. L. Gaeta,
"Intracavity frequency doubling of a Nd:YAG laser passively Q-switched by GaAs,"
Opt. Comm. 137, 93 (1997). PDF

J. K. Ranka, R. W. Schirmer, and A. L. Gaeta,
"Observation of pulse splitting in nonlinear dispersive media,"
Phys. Rev. Lett. 77, 3783 (1996). PDF

M. Y. Lanzerotti, R. W. Schirmer, and A. L. Gaeta,
"High-reflectivity, wide-bandwidth optical phase conjugation using potassium vapor,"
Appl. Phys. Lett. 69, 1199 (1996). PDF

T. Kajava and A. L. Gaeta,
"Q switching of a diode-pumped Nd:YAG laser with GaAs,"
Opt. Lett. 21, 1244 (1996). PDF

W. V. Davis, A. L. Gaeta, R. W. Boyd, and G. S. Agarwal,
"Statistical-noise properties of an optical amplifier utilizing two-beam coupling in
atomic potassium vapor,"
Phys. Rev. A 53, 3625 (1996). PDF

M. Y. Lanzerotti and A. L. Gaeta,
"Theory of quantum optical measurements with a phase-conjugate mirror,"
Phys. Rev. A 51, 4057 (1995). PDF

T. D. Krauss, J. K. Ranka, F. W. Wise, and A. L. Gaeta,
"Measurements of the tensor properties of third-order nonlinearities in wide-gap semiconductors,"
Opt. Lett. 20, 1110 (1995). PDF

W. V. Davis, M. Kauranen, E. M. Nagasako, R. J. Gehr, A. Gaeta, and R. W. Boyd,
"Excess noise acquired by a laser beam after propagating through atomic potassium vapor,"
Phys. Rev. A 51, 4152 (1995). PDF

M. Y. Lanzerotti and A. L. Gaeta,
"Optical phase conjugation of nonclassical fields,"
Phys. Rev. A 51, 3182 (1995). PDF

M. O. Kauranen, A. L. Gaeta, R. W. Boyd, and G. S. Agarwal,
"Amplification of vacuum fluctuations by two-beam coupling in an atomic vapor,"
Phys. Rev. A 50 929 (1994). PDF