Frequency standard using an atomic stream of optically...

Details Frequency standard using an atomic stream of optically... Frequency standard using an atomic stream of optically...

G - Physics

04

F

G04F 5/14 (2006.01) H05H 3/04 (2006.01)

Patent

CA 2083943

2083943 9119413 PCTABS00008 Beams of laser light trap and cool cesium atoms in a small vapor cell (1) and put the atoms in a particular quantum mechanical state. The lasers (3, 4) are then configured so as to launch the atoms upward by shifting the frequencies of the vertically propagating lasers. The atoms pass through a microwave waveguide (2) during both their ascent and descent. The microwave field is applied briefly each time the atoms are in the center of the waveguide so that the microwaves excite the cesium "clock" transition. Once the atoms have fallen back to where they started, the laser fields are turned on in a particular sequence. The fraction of the atoms that make a quantum mechanical transition is measured by observing the laser light scattered by the atoms. That signal indicates how close the microwave frequency is to the atomic transition. The laser cooling reduces the relative motion of the atoms so that the atoms can be observed longer. The resulting atomic resonance measured is much narrower.

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