Oscillators – Molecular or particle resonant type
Reexamination Certificate
2006-09-05
2006-09-05
Mis, David (Department: 2817)
Oscillators
Molecular or particle resonant type
Reexamination Certificate
active
07102451
ABSTRACT:
The present invention provides a method and apparatus for increasing the intensity of coherent population trapping (CPT) resonances, used in atomic clocks and magnetometers, by pumping the atoms with light of alternating polarization. Pumping with such light, characterized by a photon spin vector that alternates in direction at a hyperfine frequency of the atoms at the location of the atoms, is referred to as push-pull pumping. In one embodiment of the system of the present invention, alkali-metal vapor is pumped with alternating circular-polarization D1laser light that is intensity modulated at appropriate resonance frequencies, thereby exciting CPT resonances, which can be observed as increase in the mean transmittance of the alkali-metal vapor. These resonances are substantially enhanced due to an optically-induced concentration of atoms in the resonant energy sublevels.
REFERENCES:
patent: 2005/0212607 (2005-09-01), Happer et al.
W.E. Bell and A.L. Bloom, “Optically Driven Spin Precession”, Phys. Rev. Lett.6(6):280-81.
W.E. Bell and A.L. Bloom, “Optical Detection of Magnetic Resonance in Alkali Metal Vapor”, Phys. Rev. 107(6):1559-1556 (1957).
D.E. Nikonov et al., “Atomic Coherence Effects Within The Sodium D1 Manifold: II. Coherent Optical Pumping”,Quantum Opt. 6: 245-60.
J. Vanier, et al., “Contrast and Linewidth of the Coherent Population Trapping Transmission Hyperfine Resonance Line in 87Rb: Effect of Optical Pumping”, Phys. Rev. A67: (065801): 1-4 (2003).
Happer William
Jau Yuan-Yu
Kuzma Nicholas N.
Miron Eli
Post Amber B.
Mathews, Shepherd, McKay & Bruneau, P.A.
Mis David
Princeton University, Office of Technology, Licensing & Int
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