41 citations · 116 across the 7 of their papers we have counts for
8 papers
Joint System and Algorithm Design for Computationally Efficient Fan Beam Coded Aperture X-ray Coherent Scatter Imaging
Ikenna Odinaka, Joseph A. O'Sullivan, David G. Politte +8
In x-ray coherent scatter tomography, tomographic measurements of the forward scatter distribution are used to infer scatter densities within a volume. A radiopaque 2D pattern plac…
Spectrally Grouped Total Variation Reconstruction for Scatter Imaging Using ADMM
Ikenna Odinaka, Yan Kaganovsky, Joel A. Greenberg +5
We consider X-ray coherent scatter imaging, where the goal is to reconstruct momentum transfer profiles (spectral distributions) at each spatial location from multiplexed measureme…
Steady-state, cavity-less, multimode superradiance in a cold vapor
Joel A. Greenberg, Daniel J. Gauthier
We demonstrate steady-state, mirrorless superradiance in a cold vapor pumped by weak optical fields. Beyond a critical pump intensity of 1 mW/cm, the vapor spontaneously transf…
High-order optical nonlinearity at low light levels
Joel A. Greenberg, Daniel J. Gauthier
We observe a nonlinear optical process in a gas of cold atoms that simultaneously displays the largest reported fifth-order nonlinear susceptibility χ^(5) = 1.9x10^{-12} (m/V)^4 an…
Controllable ultra-broadband slow light in a warm Rubidium vapor
Rui Zhang, Joel A. Greenberg, Martin C. Fischer +1
We study ultra-broadband slow light in a warm Rubidium vapor cell. By working between the D1 and D2 transitions, we find a several-nm window centered at 788.4 nm in which the group…
Transient dynamics and momentum redistribution in cold atoms via recoil-induced resonances
Joel A. Greenberg, Daniel J. Gauthier
We use an optically dense, anisotropic magneto-optical trap to study recoil-induced resonances (RIRs) in the transient, high-gain regime. We find that two distinct mechanisms gover…
All-Optical Switching with Transverse Optical Patterns
Andrew M. C. Dawes, Lucas Illing, Joel A. Greenberg +1
We demonstrate an all-optical switch that operates at ultra-low-light levels and exhibits several features necessary for use in optical switching networks. An input switching beam,…
Formation of laser plasma channels in a stationary gas
A. Dunaevsky, A. Goltsov, J. Greenberg +3
The formation of plasma channels with nonuniformity of about +- 3.5% has been demonstrated. The channels had a density of 1.2x10^19 cm-3 with a radius of 15 um and with length >= 2…