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Featured researches published by C. Gerz.


Applied Physics B | 1995

Three-dimensional Spatial Diffusion in Optical Molasses

T. W. Hodapp; C. Gerz; C. Furtlehner; C. I. Westbrook; William D. Phillips; Jean Dalibard

We have studied the expansion of a small cloud of85Rb atoms in three-dimensional optical molasses (lin ⊥ lin and σ+ − σ− configurations) and observed diffusive motion. We determined the spatial-diffusion coefficients for various laser intensities and detunings, and compared them (in the case of lin ⊥ lin molasses) to values calculated from friction and momentum-diffusion coefficients of a one-dimensional (1D) theory of laser cooling. The predicted variations of the spatial-diffusion coefficient with laser intensity and detuning are in good qualitative agreement with the experimental data. We found that the minimal value observed experimentally, ≈ 6 × 10−4 cm2/s, lies within a factor of 3 of the 1D theoretical minimum, ≈, 26ħ/M, whereM is the atomic mass.


Thirteenth International conference on atomic physics (ICAP‐13) | 2008

Observation of quantized motion of atoms in optical molasses

S L. Rolston; C. Gerz; Paul D. Lett; William D. Phillips; R. J. C. Spreeuw; C. I. Westbrook; P. S. Jessen

We have observed the quantized motion of atoms trapped in wavelength‐sized optical potential wells. Using high‐resolution spectroscopy of the resonance fluorescence of laser‐cooled Rb atoms, we have identified spontaneous Raman transitions between bound vibrational levels. From the fluorescence spectrum, we can measure the spacing of the vibrational levels, population distributions and temperatures, and determine that the atoms are localized to λ/15. These measurements are in excellent quantitative agreement with recent quantum Monte Carlo calculations.


Physica B-condensed Matter | 1994

Demonstration of a microwave trap for cesium atoms

Lori S. Goldner; R. J. C. Spreeuw; C. Gerz; William D. Phillips; M.W. Reynolds; S L. Rolston; Isaac F. Silvera; C. I. Westbrook

Abstract We report on the first realization of a microwave trap for neutral atoms, as proposed originally for use with spin-polarized hydrogen [1]. This trap is advantageous for attaining Bose condensation because it can contain strong or weak field seekers, while static magnetic traps contain only the less-stable weak-field seeking states. In this experiment, Cs atoms were confined in the microwave field of a room-temperature spherical resonator (Q≈5500) whose TE 110 mode is tuned to the blue of the ground state hyperfine splitting (9.2 GHz). Using up to 83 W of microwave power, the trap is shallow (≤100μK), large (≈1 cm) and cannot, by itself, hold Cs atoms up against gravity. We levitate atoms in the trapping state ( F=4, m F =4 ground state) with a static magnetic field gradient. The trap is loaded with atoms cooled to 5 μK in optical molasses. To detect the atoms, we either release them from the trap and detect their fluorescence as they fall through a probe laser beam, or we observe them with a ccd camera as we illuminate them with laser pulses. Plans for applying this technique to spin-polarized hydrogen will be discussed in a separate presentation [2].


Physica B-condensed Matter | 1994

The microwave trap and prospects for Bose-Einstein condensation

Isaac F. Silvera; C. Gerz; Lori S. Goldner; William D. Phillips; M.W. Reynolds; S L. Rolston; R. J. C. Spreeuw; C. I. Westbrook

Abstract The microwave trap (MW) was proposed as a method of achieving Bose-Einstein condensation (BEC) in spin-polarized atomic hydrogen, H↓. We have experimentally demonstrated this new type of atomic trap using the cesium atom. Here we review and discuss the implications and limitations of this trap for BEC.


AIP Conference Proceedings (American Institute of Physics); (United States) | 1993

Demonstration of the microwave trap for cesium atoms

R. J. C. Spreeuw; C. Gerz; Lori S. Goldner; William D. Phillips; S L. Rolston; M.W. Reynolds; Isaac F. Silvera

We have demonstrated trapping of neutral cesium atoms by the dipole force in a microwave field, as proposed by Agosta et al. The trap is approximately 100 μK deep and was loaded with laser‐cooled cesium atoms. The trap lifetime of about 1 s was probably limited by collisions with background gas. The microwave trap holds promise for reaching the conditions for Bose‐Einstein condensation in atomic hydrogen or the alkalis.


Physical Review Letters | 1992

Observation of quantized motion of Rb atoms in an optical field.

Poul S. Jessen; C. Gerz; Paul D. Lett; William D. Phillips; Steven L. Rolston; R. J. C. Spreeuw; C. I. Westbrook


Physical Review Letters | 1994

Momentum transfer in laser-cooled cesium by adiabatic passage in a light field

Lori S. Goldner; C. Gerz; R. J. C. Spreeuw; Steven L. Rolston; C. I. Westbrook; William D. Phillips; P. Marte; P. Zoller


Physical Review Letters | 1994

Demonstration of neutral atom trapping with microwaves

R. J. C. Spreeuw; C. Gerz; Lori S. Goldner; William D. Phillips; S L. Rolston; C. I. Westbrook; M.W. Reynolds; Isaac F. Silvera


EPL | 1993

The Temperature of Optical Molasses for Two Different Atomic Angular Momenta

C. Gerz; T. W. Hodapp; Poul S. Jessen; Kevin M. Jones; William D. Phillips; C. I. Westbrook; K. Mølmer


Quantum Optics: Journal of The European Optical Society Part B | 1994

Coherent transfer of photon momentum by adiabatic following in a dark state

Lori S. Goldner; C. Gerz; R. J. C. Spreeuw; S L. Rolston; C. I. Westbrook; William D. Phillips; P. Marte; P. Zoller

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William D. Phillips

National Institute of Standards and Technology

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C. I. Westbrook

Centre national de la recherche scientifique

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S L. Rolston

National Institute of Standards and Technology

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Lori S. Goldner

National Institute of Standards and Technology

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T. W. Hodapp

National Institute of Standards and Technology

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P. Marte

University of Colorado Boulder

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