Proposal of a truncated atomic beam fountain for reduction of collisional frequency shift

Journal Article · Thu Jul 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.013632· OSTI ID:21442981

Takamizawa, A; Yanagimachi, S; Ikegami, T ^[1]; Shirakawa, Y ^[2]

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1. National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8563 (Japan)
2. Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda shi, Chiba 278-8510 (Japan)

We propose an atomic fountain clock with a truncated cold atomic beam to achieve both a low collisional frequency shift and high frequency stability. In this clock, the launching velocity of a cold atomic beam can be swept to reduce the atomic density in the interrogation region for the Ramsey resonance and to increase the atomic density in the detection region. Before the top of the beam arrives at the interrogation region, the cold atomic beam is truncated by turning off the cooling laser beams to remove the unnecessary light shift. The atomic density in the interrogation region is theoretically evaluated to be 0.04 times that in an ordinary atomic fountain with optical molasses for the same number of detected atoms. The frequency stability limit due to quantum projection noise is calculated to reach 6.4x10{sup -14} in 1 s from the number of detected atoms while the fractional collisional shift is estimated to be {approx}{sup -}2x10{sup -16}.

• OSTI ID: 21442981
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMIC BEAMS
ATOMS
BEAMS
COLLISIONS
DENSITY
DETECTION
ELECTROMAGNETIC RADIATION
LASER RADIATION
NOISE
PHYSICAL PROPERTIES
RADIATIONS
RESONANCE