A model experiment for stand-off sensing (2008)
Ariunbold, G. O., Kash, M. M., Li, H., Sautenkov, V. A., Rostovtsev, Y. V., Welch, G. R., ...
Sautenkov, V. A., Ye, C. Y., Rostovtsev, Y. V., Welch, G. R., Scully, M. O.
We have experimentally demonstrated the enhancement of coherent Raman scattering in Rb atomic vapor by exciting atomic coherence with fractional stimulated Raman adiabatic passage. Experimental...
Nonlinear optics via double dark resonances (2003)
Yelin, S. F., Sautenkov, V. A., Kash, M. M., Welch, G. R., Lukin, M. D.
Double dark resonances originate from a coherent perturbation of a system displaying electromagnetically induced transparency. We experimentally show and theoretically confirm that this leads to the...
Nonlinear Magneto-Optical Rotation of Elliptically Polarized Light (2002)
Matsko, A. B., Novikova, I., Zubairy, M. S., Welch, G. R.
We predict theoretically and demonstrate experimentally an ellipticity-dependent nonlinear magneto-optic rotation of elliptically-polarized light propagating in a coherent atomic medium. We show that...
Enhancement of Kerr nonlinearity via multi-photon coherence (2002)
Matsko, A. B., Novikova, I., Welch, G. R., Zubairy, M. S.
We propose a new method of resonant enhancement of optical Kerr nonlinearity using multi-level atomic coherence. The enhancement is accompanied by suppression of the other linear and nonlinear...
Vacuum Squeezing in Atomic Media via Self-Rotation (2001)
Matsko, A. B., Novikova, I., Welch, G. R., Budker, D., Kimball, D. F., Rochester, S. M.
When linearly polarized light propagates through a medium in which elliptically polarized light would undergo self-rotation, squeezed vacuum can appear in the orthogonal polarization. A simple...
Enhancement of Magneto-Optic Effects via Large Atomic Coherence (2001)
Sautenkov, V. A., Lukin, M. D., Bednar, C. J., Scully, M. O., Welch, G. R., Fleischhauer, M., ...
Abstract: We utilize the generation of large atomic coherence to enhance the resonant nonlinear magneto-optic effect by several orders of magnitude, thereby eliminating power broadening and improving...
Macromolecular interactions: tracing the roots (2001)
Clegg, J., Kell, Douglas, Knull, H., Welch, G. R., Wilson, J.
The late Paul Srere used the above as the title to his last publication in TiBS [1]. Two major theses of that paper are first, that the importance of macromolecular interactions is not ‘new’ to...
Radiation trapping in coherent media (2001)
Matsko, A. B., Novikova, I., Scully, M. O., Welch, G. R.
We show that the effective decay rate of Zeeman coherence, generated in a Rb87 vapor by linearly polarized laser light, increases significantly with the atomic density. We explain this phenomenon as...
Enhancement of Magneto-Optic Effects via Large Atomic Coherence (1999)
Sautenkov, V. A., Lukin, M. D., Bednar, C. J., Welch, G. R., Fleischhauer, M., Velichansky, V. L., ...
We utilize the generation of large atomic coherence to enhance the resonant nonlinear magneto-optic effect by several orders of magnitude, thereby eliminating power broadening and improving the...
Hendriksen, P.J.M., Welch, G.R., Grootegoed, J.A., Johnson, L.A.
The only known and measurable difference between X- and Y-chromosome bearing spermatozoa is the small difference in their DNA content. The X sperm in the human carry 2.8% more DNA than the Y sperm,...
Patterns of spatiotemporal organization in an "ambiquitous" enzyme model.
Marmillot, P, Hervagault, J F, Welch, G R
Many enzymes in pathways such as glycolysis associate reversibly with cellular substructures. The spatiotemporal behavior of a "limit-cycle" oscillation model is studied under the condition that the...
Evidence for Distinct Kynureninase and Hydroxykynureninase Activities in Neurospora crassa
Gaertner, F. H., Cole, K. W., Welch, G. R.
Previous studies have indicated that a single enzyme, “kynureninase,” catalyzes the reactions of l-kynurenine to anthranilate and l-3-hydroxykynurenine to 3-hydroxyanthranilate in Neurospora...
The aromatic complex of Neurospora crassa is an aggregated multienzyme system which catalyzes five consecutive reactions in the central pathway leading to the biosynthesis of the aromatic amino...
Transient-time analysis of substrate-channelling in interacting enzyme systems.
Ovádi, J, Tompa, P, Vértessy, B, Orosz, F, Keleti, T, Welch, G R
The kinetics of dynamically interacting enzyme systems is examined, in the light of increasing evidence attesting to the widespread occurrence of this mode of organization in vivo. The transient...
Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere
Kocharovsky, V., Cameron, S., Lehmann, K., Lucht, R., Miles, R., Rostovtsev, Y., ...
We show that gain-swept superradiance can be used to detect low (parts per million) concentrations of various gases at distances on the order of kilometers, which is done by using pulse timing to...
The evolution of enzyme kinetic power.
Evolution of the kinetic potential of enzyme reactions is discussed. Quantitative assessment of the evolution of enzyme action has usually focused on optimization of the parametric ratio kcat./Km,...
Patterns of spatiotemporal organization in an "ambiquitous" enzyme model.
Marmillot, P, Hervagault, J F, Welch, G R
Many enzymes in pathways such as glycolysis associate reversibly with cellular substructures. The spatiotemporal behavior of a "limit-cycle" oscillation model is studied under the condition that the...
Evidence for Distinct Kynureninase and Hydroxykynureninase Activities in Neurospora crassa
Gaertner, F. H., Cole, K. W., Welch, G. R.
Previous studies have indicated that a single enzyme, “kynureninase,” catalyzes the reactions of l-kynurenine to anthranilate and l-3-hydroxykynurenine to 3-hydroxyanthranilate in Neurospora...
The aromatic complex of Neurospora crassa is an aggregated multienzyme system which catalyzes five consecutive reactions in the central pathway leading to the biosynthesis of the aromatic amino...
Transient-time analysis of substrate-channelling in interacting enzyme systems.
Ovádi, J, Tompa, P, Vértessy, B, Orosz, F, Keleti, T, Welch, G R
The kinetics of dynamically interacting enzyme systems is examined, in the light of increasing evidence attesting to the widespread occurrence of this mode of organization in vivo. The transient...
Gain-swept superradiance applied to the stand-off detection of trace impurities in the atmosphere
Kocharovsky, V., Cameron, S., Lehmann, K., Lucht, R., Miles, R., Rostovtsev, Y., ...
We show that gain-swept superradiance can be used to detect low (parts per million) concentrations of various gases at distances on the order of kilometers, which is done by using pulse timing to...
The evolution of enzyme kinetic power.
Evolution of the kinetic potential of enzyme reactions is discussed. Quantitative assessment of the evolution of enzyme action has usually focused on optimization of the parametric ratio kcat./Km,...