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Displaying 49176 - 49200 of 73779

Giving a Boost to Atoms

December 1, 1999
Author(s)
Kristian Helmerson
Matter waves can now be amplified in the same way that a laser amplifies light. Such matter-wave amplifiers will be essential for future developments in atom optics.

High Temperature Deformation of Silicon Nitride

December 1, 1999
Author(s)
Sheldon M. Wiederhorn
Three mechanisms for the creep of silicon nitride are discussed with regard to the microstructural variables that control creep. During the initial stages of creep, the amorphous silicate layer that coats all grains of silicon nitride is displaced from

High-Speed Resonant Cavity Enhanced Photodiodes

December 1, 1999
Author(s)
M. S. {Umlat}nl{umlat}, E. Vzbay, E. Towe, Richard Mirin, David H. Christensen
We have demonstrated RCE Schottky phodiodes with GaAs absorption regions in AlGaAs/AlAs microcavities (3).

Hydrodynamic Excitations for a Trapped Fermi Gas

December 1, 1999
Author(s)
G M. Bruun, Charles W. Clark
We discuss collective excitations of a trapped dilute Fermi gas within a hydrodynamic approximation. Analytical results are derived for both high- and low -temperature limits and are applied to 40K and 6Li systems of current experimental interest. We

Ion-Molecule Reactions and Ion Energies in CF 4 Discharges

December 1, 1999
Author(s)
B. Peko, I. V. Dyakov, R. Champion, MVVS. Rao, James K. Olthoff
Absolute cross sections have been measured for reactants typically found in carbon tetrafluoride (CF 4) discharges for collision energies below a few hundred electron volts. The reactions investigated include collision-induced dissociation and dissociative

Kilohertz Linewidth From Frequency-Stabilized Mid-Infrared Quantum Cascade Lasers

December 1, 1999
Author(s)
R M. Williams, J F. Kelly, J S. Hartman, S W. Sharpe, M S. Taubman, J L. Hall, F Capasso, D L. Sivco, J N. Bailargeon, Yoshi Ohno
Frequency stabilization of mid-IR quantum cascade (AC) lasers to the kilohertz level has been accomplished by use of electronic servo techniques. With this acive feedback, an 8.5- m QC distributed-feedback laser is locked to the side of a rovibrational
Displaying 49176 - 49200 of 73779
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