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Springer eBooks

Results of Atom Interferometry Experiments with Potassium

John F. Clauser

Published Jan 1, 1995• 0 citations
Publisher
DOI
10.1007/978-94-015-8529-3_8

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Results of atom interferometry experiments in generalized Talbot-vonLau configurations are presented. AC modulated D2 light from diode lasers is counter-directed on a thermal potassium beam. A pA AC current of cold, slow potassium atoms is extracted through a slit in a heated mirror, transmitted through an interferometer, and ionized by a hotwire. The interferometer consists of a sequence of three planar vacuum slit diffraction gratings, microfabricated from silicon nitride membranes. Interference fringes form a Moire with the third grating and are sensed by measuring the transmission as a function of grating relative position. Different spatial Fourier components (up to 5th) in the diffraction pattern, resonant in the interferometer at different atomic velocities, may be selected via the tuning of the cooling lasers. Shifts of the patterns by gravity and rotation are evident when the vacuum chamber is tilted.
In the CAPRICE experiment, the authors employ atom interferometry to compare the free fall of potassium and rubidium atoms with a differential atomic gravimeter. This leads to a precision test of the universality of free fall with two quantum objects. The paper presents the first results with the single species rubidium gravimeter and show the progress of the system update to trap and manipulate potassium atoms. The progress in working with an optical dipole trap at a wavelength of 1960 nm was also presented.