NDLI: Does the light shift drive frequency aging in the rubidium atomic clock?

Content Provider	IEEE Xplore Digital Library
Author	Camparo, J.
Copyright Year	1986
Abstract	Frequency aging in the rubidium (Rb) vapor-cell atomic clock plays a significant role in the device's timekeeping ability. Though many researchers have speculated on the physical mechanism(s) driving the linear, deterministic frequency change (i.e., /spl Delta/f(t)/f/sub o/ = At), there is little unambiguous experimental data regarding the phenomenon. Here, long-term data were used from on-orbit global positioning system (GPS) Rb clocks to examine one postulated mechanism for frequency aging (i.e., the light-shift effect). Defining the light shift of the clock's fractional frequency as /spl alpha/I/I/sub o/, where /spl alpha/ is the light-shift coefficient, we find that temporal variations of the relative light intensity, I/I/sub o/ cannot account for frequency aging. However, for the population of clocks considered here, we obtain the intriguing result that /spl lambda//A = 1.7 /spl plusmn/ 1.5. Thus, it may be that frequency aging is driven by the light-shift effect through temporal variations of the light-shift coefficient.
Starting Page	1075
Ending Page	1078
Page Count	4
File Size	647491
File Format	PDF
ISSN	08853010
Volume Number	52
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aging Atomic clocks Stability Global Positioning System Frequency synchronization Stationary state Resonance Laboratories Atomic beams Root mean square
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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