Horology: time measuring systems or devices – Combined with disparate device
Reexamination Certificate
2005-05-03
2005-05-03
Miska, Vit W. (Department: 2841)
Horology: time measuring systems or devices
Combined with disparate device
C368S156000, C324S301000, C324S304000, C331S003000, C331S094100
Reexamination Certificate
active
06888780
ABSTRACT:
The present invention provides a method and system to simultaneously use the microwave and Zeeman end resonances associated with the same sublevel of maximum (or minimum) azimuthal quantum number m to lock both the atomic clock frequency and the magnetic field to definite values. This eliminates the concern about the field dependence of the end-resonance frequency. In an embodiment of the system of the present invention, alkali metal vapor is pumped with circularly-polarized D1laser light that is intensity-modulated at appropriate resonance frequencies, thereby providing coherent population trapping (CPT) resonances. In another embodiment, pumping with constant-intensity circularly-polarized D1laser light enhances magnetic resonances that are excited by alternating magnetic fields oscillating at appropriate resonance frequencies. In both embodiments, the resonances are greatly enhanced by concentrating most of the atoms in the initial state of the resonances, and by diminishing the spin-exchange broadening of the resonances. This leads to greater stability of optically pumped atomic clocks. This invention can also be used to operate an atomic magnetometer, where the feedback signal used to stabilize the magnetic field at the alkali-vapor cell can serve as a sensitive measure of the ambient magnetic field.
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Bell, W et al., “Optical Detection of Magnetic Resonance in Alkali Metal Vapor”, Physical Review, vol. 107, No. 6, Sep. 15, 1657, pp 1559-1565.
Happer William
Kuzma Nicholas N.
Mathews, Collins Shepherd & McKay, P.A.
Miska Vit W.
Princeton University
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