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Displaying records 21 to 30 of 49 records.
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21. High-Fidelity, Weak-Light Polarization Gate Using Room-Temperature Atomic Vapor
Lu Deng, Runbing Li, Chengjie Zhu, Edward W Hagley
Using a polarization-selective-Kerr-phase-shift technique we demonstrate an all-optical
polarization gate in an atomic gain medium with the control-field intensity equivalent to 20
photons of 10 nanoseconds propagating in a 5 μm mode diamete ...
22. Highly Efficient Counter-Propagating Narrow-Band Ultraviolet
Frequency Conversion in a Quantum Gas
chengjie Zhu, Lu Deng, Edward W Hagley
We show that highly efficient ultraviolet frequency up conversion can be established in a single-component quantum gas in the counter-propagating weak pump beam geometry where no frequency up conversion can occur in a normal gas. We also show that al ...
23. Highly efficient, broadband coherent surface-mixing-wave generation using amplified
surface plasmonic polaritons
C. J. Zhu, X Zhao, Guoxiang Huang, Lu Deng, Edward W Hagley, Yan Ren
We show that coherent broadband surface mixing-wave (SMW) by a hyper-Raman process can be
efficiently generated near a metallic surface abutting a quasi-three-level gain medium. The
generation process is significantly enhanced by the amplified surf ...
24. Hybrid quantum-well system for
Lu Deng, Edward W Hagley, Chengjie Zhu
We consider a hybrid quantum-well structure consisting of regions whose properties alternate
Raman gain and electromagnetically induced transparency. We present both analytical and
numerical results that
indicate a large light be ...
25. Imaging the Phase of an Evolving Bose-Einstein Condensate Wave Function
J E Simsarian, J Denschlag, M Edwards, Charles W Clark, Lu Deng, Edward W Hagley, Kristian Helmerson, S L. Rolston, William D Phillips
We demonstrate a spatially resolved autocorrelation measurement with a Bose-Einstein condensate (BEC) and measure the evolution of the spatial profile of its quantum mechanical phase. After releasing the BEC from the magnetic trap, the phase develop ...
26. Impact of photo-assisted collisions on superradiant light scattering with Bose-condensates
Lu Deng, Xinyu Luo, Edward W Hagley, Ruquan Wang
We present experimental evidence supporting the postulation that the secondary effects of light assisted collisions are the main reason that the superradiant light scattering efficiency in condensates is asymmetric with respect to the sign of the pum ...
27. Light-Wave Mixing in Quantum Gases
Lu Deng, Edward W Hagley, R Q. Wang, Charles W Clark
Ninety-five years after Einstein‰s theoretical prediction, we are surrounded in our daily lives
by its practical applications. For example, multi-channel telecommunication lasers and even the
commonly-used green laser pointers that cost just a fe ...
28. Linear and nonlinear Faraday rotations of light polarization in a four-level
Lu Deng, Chengjie Zhu, Edward W Hagley
We investigate linear and nonlinear Faraday effects in a room-temperature, coherently driven
Raman-gain (ARG) medium. By using the multiple-scale method, we derive two nonlinear coupled
equations governing the dynami ...
29. Matter-wave self-imaging by atomic center-of-mass motion induced interference
Ke Li, Lu Deng, Edward W Hagley, M.S. Zhan, M 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 ...
30. Measurement of the Coherence of a Bose-Einstein Condensate
Edward W Hagley, Lu Deng, M M Kozuma, M Trippenbach, Y B Band, M Edwards, M R Doery, Paul S Julienne, Kristian Helmerson, S L. Rolston, William D Phillips
We study the coherence properties of a Bose-Einstein condensates using an interference technique. Two 100 ns optical standing wave pulses are applied to a condensate with a variable time delay between them. Each standing wave phase grating makes sm ...