U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Edward Hagley (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 51 - 75 of 103

Observation of Collective Atomic Recoil Motion in a Degenerate Fermion Gas

May 23, 2011
Author(s)
Lu Deng, Edward W. Hagley
We demonstrate collective atomic recoil motion with a dilute, ultracold, degenerate fermion gas in a single spin state. By utilizing an adiabatically decompressed magnetic trap with an aspect ratio different from that of the initial trap, a momentum

Observation of the red-blue detuning asymmetry in matter-wave superradiance

November 23, 2010
Author(s)
Lu Deng, Edward W. Hagley, Qiang Cao, Xiaorui Wang, Xinyu Luo, Ruquan Wang, Fan Yang, Xiaoji Zhou, Xuzong Chen, M. G. Payne, Mingsheng Zhan
We show the first experimental observations of matter-wave superradiance using blue-detuned light, and demonstrate a pump-laser detuning asymmetry in the collective atomic recoil motion. In contrast to all previous theoretical treatments, which predict

Collective atomic recoil motion in short-pulse matter-wave superradiance

November 11, 2010
Author(s)
Lu Deng, Edward W. Hagley
We show that a Bragg resonance is substantially incapacitated in short-pulse, matter-wave superradiant scatterings and both positive- and negative-order scatterings contribute equally.We further show that propagation gain is small and scattering events

A Green Laser Pointer Hazard

August 2, 2010
Author(s)
Jemellie Galang, Alessandro Restelli, Edward W. Hagley, Charles W. Clark
An inexpensive green laser pointer was found to emit 20 mW of infrared radiation during normal use. This is potentially a serious hazard that would not be noticed by most users of such pointers. We find that the problem derives from an unsafe design, and

Electromagnetic Wave Dynamics in Matter-Wave Superradiant Scattering

February 2, 2010
Author(s)
Lu Deng, Edward W. Hagley, Marvin Payne
We present a small-signal wave propagation theory on matter-wave superradiant scattering. We show, in a longitudinally excited condensate, that the backward-propagating, superradiantly generated optical field propagates with ultraslow group velocity and

Matter-wave self-imaging by atomic center-of-mass motion induced interference

December 18, 2008
Author(s)
Ke Li, Lu Deng, Edward W. Hagley, M.S. Zhan, Marvin G. Payne
We demonstrate matter-wave self-imaging in a stationary light field in the non-Raman-Nath limit. We show that in a non-instantaneous pulsed standing wave grating significant contributions due to the non-negligible atomic center of mass motion and

Fast-responding nonlinear phase shifter using a signal-wave gain medium

April 22, 2008
Author(s)
Lu Deng, Edward W. Hagley, Kaijun Jiang, Marvin G. Payne
Using a full density matrix formalism we show that for a lifetime broadened four-level scheme with a signal wave gain medium a large nonlinear phase shift can be induced without signal wave slowdown and attenuation. In this system the signal wave acquires