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Displaying records 11 to 20 of 28 records.
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11. Progress at NIST in measuring the D-lines of Li isotopes using an optical frequency comb
Topic: Atomic Physics
Published: 12/20/2010
Authors: Clayton Simien, Samuel Middleton Brewer, Joseph N Tan, John D Gillaspy, Craig J Sansonetti
Abstract: Precise spectroscopic experiments with light atoms can provide information about nuclear properties that are very difficult to obtain in electron scattering experiments. For example, relative nuclear radii of low-Z isotopes can be determined accurat ...

12. Observation of the red-blue detuning asymmetry in matter-wave superradiance
Topic: Atomic Physics
Published: 11/23/2010
Authors: Lu Deng, Edward W Hagley, Qiang Cao, Xiaorui Wang, Xinyu Luo, Ruquan Wang, Fan Yang, Xiaoji Zhou, Xuzong Chen, M. G. Payne, Mingsheng Zhan
Abstract: 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 p ...

13. Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Barium (Ba III through Ba LVI)
Topic: Atomic Physics
Published: 11/19/2010
Authors: Jean Ellen Sansonetti, John J Curry
Abstract: Energy levels, with designations and uncertainties, have been compiled for the spectra of barium (Z=56) ions from doubly-ionized to hydrogen-like. Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addi ...

14. Phases of a 2D Bose Gas in an Optical Lattice
Topic: Atomic Physics
Published: 9/9/2010
Authors: Karina K. Jimenez Garcia, Yu-Ju Lin, James V Porto, Ian B Spielman
Abstract: Ultra-cold atoms in optical lattices realize essential models in condensed matter physics. Like with most experiments with ultra-cold atoms, our Rubidium-87 Bose Einstein condensate is confined in a harmonic trapping potential that persists even ...

15. Low-Frequency Characterization of MEMS-Based Portable Atomic Magnetometer
Topic: Atomic Physics
Published: 6/2/2010
Authors: Rahul R. Mhaskar, Svenja A Knappe, John E Kitching
Abstract: Atomic magnetometers based on absorption or polarization rotation of light in an alkali vapor have recently demonstrated sensitivities rivaling those of superconducting quantum interference devices (SQUIDs). Miniaturization of such devices containing ...

16. Number Enhancement for Compact Laser-Cooled Atomic Samples by use of Stimulated Radiation Forces
Topic: Atomic Physics
Published: 6/2/2010
Authors: Elizabeth A Donley, Tara C. Liebisch, Eric M. (Eric) Blanshan, John E Kitching
Abstract: For cold samples of laser-cooled atoms to be most useful in emerging technologies such as compact atomic clocks and sensors, it is necessary to achieve small sample sizes while retaining a large number of cold atoms. We consider achieving large atom ...

17. Quasi-phasematched Second Harmonic Generation in GaAs Microdisks
Topic: Atomic Physics
Published: 11/15/2009
Authors: Paulina S Kuo, W Fang, Glenn Scott Solomon
Abstract: We discuss design and tuning of second-harmonic generation in GaAs microdisks. Quasi-phasematching can be achieved in the microdisk geometry without external domain inversions, but efficient nonlinear optical mixing requires that all waves be resonan ...

18. Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity
Topic: Atomic Physics
Published: 10/26/2009
Authors: John E Kitching, Svenja A Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
Abstract: We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens o ...

19. Dynamics of coupled ultraslow optical solitons in a coherent four-state double-¿ system
Topic: Atomic Physics
Published: 8/15/2009
Authors: Lu Deng, Guoxiang Huang
Abstract: We present a systematical investigation, both analytical and numerical, on the dynamics of two nearly lossless and distortion-free weak nonlinear optical pulses in a cold, lifetime-broadened four-state double-Λ system via electromagnetically ...

20. Realization of a single and closed Lambda-system in a room-temperature three-level coherently prepared resonant medium with narrow D 1 hyperfine splittings
Topic: Atomic Physics
Published: 7/9/2009
Authors: Ke Li, Lu Deng, M G Payne
Abstract: A single, closed three-state Ë-system using a parallel-polarization, co-propagating beam configuration in rubidium is investigated experimentally for efficient group velocity reduction at room temperature using electromagnetically induced transp ...

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