Oscillators – Molecular or particle resonant type
Patent
1989-02-28
1990-08-07
Mis, David
Oscillators
Molecular or particle resonant type
331 3, H01S 106, H03B 1700, H03L 726
Patent
active
049471376
ABSTRACT:
The passive frequency standard of this invention comprises a cell (42) containing Rb87 and a source of predetermined spectral component which, by optical pumping, empties the level F=1, m.sub.F =0 and populates the level F=2, m.sub.F =0. This source comprises a lamp (40) and an isotopic filter constituted by Rb 85 contained in the cell (42). A helicoidal resonator (44) is tuned to the transition frequency between level F=2, m.sub.F =0 and level F=1, m.sub.F =0. It receives an excitation signal for stimulating such transition from an oscillator via a connector (64). The frequency of the oscillator is slaved to the transition frequency by slave means comprising a photoelectric cell (46) which receives the light from the lamp (40) through the cell (42).
REFERENCES:
patent: 3584292 (1971-06-01), Dehmelt
Walls, F. L., "Characteristics and Performance of Miniature NBS Passive Hydrogen Masers", IEEE X-Oninstrumentation and Measurement, vol. IM-36, No. 2, Jun. 87, pp. 596-603.
Laser Focus, vol. 18, No. 2, Feb. 82, pp. 18, 20, "Laser Diode Improves Lifetime and Accuracy of Atomic Clocks".
Jechart, E., "Rubidium-Gaszellenfrequenznormal In Miniature Ausfuhrung", Elektronik, vol. 22, No. 12, 1974, pp. 457-460.
Proceedings of the 40th Annual/Frequency Symposium 1986, Philadelphia, Pa., pp. 470-473, IEEE; Weidemann, W., "Subminiature Rubidium Oscillator Model FRS".
Busca Giovanni
Johnson Leland
Mis David
Oscilloquartz S.A.
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