Toward a primary frequency standard based on a continuous fountain of laser-cooled cesium atoms
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منابع مشابه
Realisation of a Frequency Standard Using an Atomic Fountain *
We report the realisation and preliminary study of a frequency standard using a fountain of laser cooled caesium atoms. Our apparatus uses a magneto-optical trap as a source of cold atoms and optical pumping to prepare the atoms in the correct state before they enter the microwave cavity.
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We describe the operation of a laser cooled cesium fountain clock in the quantum limited regime. An ultrastable cryogenic sapphire oscillator is used to measure the short-term frequency stability of the fountain as a function of the number of detected atoms Nat. For Nat varying from 4 3 104 to 6 3 105 the Allan standard deviation of the frequency fluctuations is in excellent agreement with the ...
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Communications Research Laboratory (CRL) has been conducting the development of a Cesium atomic fountain primary frequency standard. Cs atoms are collected in a MOT and in optical molasses. They are further cooled to 2μK by PGC, and launched to a height of 30cm above the microwave cavity by moving molasses method. The launched atoms interact with the microwave twice, going upward and downward, ...
متن کاملHertz-level measurement of the optical clock frequency in a single 88Sr+ ion.
The frequency of the 5s 2S(1/2)-4d 2D(5/2) electric quadrupole clock transition in a single, trapped, laser-cooled 88Sr+ ion has been measured by using an optical frequency comb referenced to a cesium fountain primary frequency standard. The frequency of the transition is measured as 444,779,044,095,484.6 (1.5) hertz, with a fractional uncertainty within a factor of 3 of that of the cesium stan...
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An optical frequency standard based on an ensemble of neutral calcium atoms laser-cooled to 12 μK has been realized. By using ultracold atoms, one major previous source of uncertainty, the residual Doppler effect, was reduced. We show that cold collisions contribute a negligible amount to the uncertainty. The influence of a temporal evolution of the phase of the laser pulses used to interrogate...
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عنوان ژورنال:
- IEEE Trans. Instrumentation and Measurement
دوره 48 شماره
صفحات -
تاریخ انتشار 1999