DocumentCode :
3188859
Title :
A clock transition for future optical frequency standard with trapped atoms
Author :
Courtillot, I. ; Uessada, A.Q. ; Brusch, A. ; Kolker, D. ; Kovacich, R.P. ; Acef, O. ; Santarelli, G. ; Clairon, A. ; Rovera, G.D. ; Lemonde, P.
Author_Institution :
BNM-LPTF, Paris, France
fYear :
2003
fDate :
22-27 June 2003
Firstpage :
265
Abstract :
Direct observation and frequency measurement of 1S03P0 line within an accuracy of 20 kHz is reported. The resonance frequency with an accuracy of ∼ 100 kHz is reported by indirect measurement of the energy difference between 1S0 and 3P0 states. It is performed by successive frequency measurements of atomic transitions with higher linewidth, easier to observe: 1S0 - 3P1, 3P1 - 3S1 and 3S1 - 3P0 transitions. To perform direct observation of the clock transition, atoms are cooled to a temperature of ∼ 2 mK in a magneto-optical trap (MOT). Although the saturation broadening of the transition is orders of magnitude smaller than the Doppler width (1.5 MHz), a detectable signal is achieved by inducing a small leak in the MOT with a laser tuned to resonance. Atoms accumulate in the metastable 3P0 state where they escape the trap. The resonance is detected by a decrease in the MOT fluorescence signal with a contrast of 1%.
Keywords :
atomic clocks; fluorescence; frequency standards; magneto-optical devices; metastable states; particle traps; radiation pressure; radiative lifetimes; resonance; spectral line broadening; 1S03P0 line; MOT fluorescence signal; atomic cooling; atomic transitions; clock transition; energy difference; frequency measurement; magneto-optical trap; metastable 3P0 state; optical frequency standard; resonance frequency; saturation broadening; trapped atoms; Atom optics; Atomic beams; Atomic measurements; Charge carrier processes; Clocks; Energy measurement; Frequency measurement; Optical saturation; Resonance; Resonant frequency;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Quantum Electronics Conference, 2003. EQEC '03. European
Print_ISBN :
0-7803-7733-8
Type :
conf
DOI :
10.1109/EQEC.2003.1314122
Filename :
1314122
Link To Document :
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