Physics – Atomic Physics
Scientific paper
2006-05-16
Appl. Phys. B 84, 633--642 (2006)
Physics
Atomic Physics
12 pages, 9 figures
Scientific paper
10.1007/s00340-006-2279-x
We report on progress towards a measurement of the fine structure constant to an accuracy of $5\times 10^{-10}$ or better by measuring the ratio of the Planck constant to the mass of the cesium atom. Compared to similar experiments, ours is improved in three significant ways: (i) simultaneous conjugate interferometers, (ii) multi-photon Bragg diffraction between same internal states, and (iii) an about 1000 fold reduction of laser phase noise to -138 dBc/Hz. Combining that with a new method to simultaneously stabilize the phases of four frequencies, we achieve 0.2 mrad effective phase noise at the location of the atoms. In addition, we use active stabilization to suppress systematic effects due to beam misalignment.
Chiow Sheng-wey
Chu Steven
Long Quan
Mueller Holger
Vo Christoph
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