EP 2261758 A1 20101215 - Atomic clock operated with Helium-3
Title (en)
Atomic clock operated with Helium-3
Title (de)
Mit Helium-3 angetriebene Atomuhr
Title (fr)
Horloge atomique fonctionnant à l'hélium 3
Publication
Application
Priority
FR 0953901 A 20090611
Abstract (en)
The clock has a cell (1) filled with a measuring medium, and an exciter (2) i.e. laser diode, for exciting particles of the medium until a higher energy level. A photodetector (4) collects frequency of light energy reproduced by the medium, and transmits a signal to a counting device (5). An application device (9) applies static magnetic field parallel to a laser beam. A control unit (8) controls the application device to adjust the magnetic field. The medium includes helium-3 plasma. Another exciter (10) provokes the helium-3 plasma from gaseous helium-3.
Abstract (fr)
Cette horloge atomique comprend de l'hélium 3 plasma comme milieu de mesure, qui est porté à l'état de plasma pour exploiter l'état métastable de la matière et les niveaux de la structure hyperfine, dont la durée de vie est longue et qui permettent donc une mesure plus facile que les excitations d'atomes gazeux.
IPC 8 full level
G04F 5/14 (2006.01)
CPC (source: EP US)
G04F 5/14 (2013.01 - EP US)
Citation (applicant)
US 2007247241 A1 20071025 - BRAUN ALAN MICHAEL [US], et al
Citation (search report)
- [AD] US 2007247241 A1 20071025 - BRAUN ALAN MICHAEL [US], et al
- [AP] WO 2009074616 A1 20090618 - COMMISSARIAT ENERGIE ATOMIQUE [FR], et al
- [AP] WO 2009074619 A1 20090618 - COMMISSARIAT ENERGIE ATOMIQUE [FR], et al
- [A] ITANO W M: "ATOMIC ION FREQUENCY STANDARDS", PROCEEDINGS OF THE IEEE, IEEE. NEW YORK, US, vol. 79, no. 7, 1 July 1991 (1991-07-01), pages 936 - 941, XP000264852, ISSN: 0018-9219
- [A] SWALLOM D W ET AL: "An investigation of the energy exchange mechanisms involving the 2<3>S metastable level in an RF helium plasma", JOURNAL OF QUANTITATIVE SPECTROSCOPY AND RADIATIVE TRANSFER, ELSEVIER SCIENCE, OXFORD, GB, vol. 14, no. 12, 1 December 1974 (1974-12-01), pages 1185 - 1193, XP024512623, ISSN: 0022-4073, [retrieved on 19741201]
- [A] BOLLINGER, J.J. ET AL.: "Non-neutral ion plasmas and crystals, laser cooling, and atomic clock", PHYS. PLASMAS, vol. 1, no. 1, 1994, XP002563571
- [A] ERTMER W ET AL: "Some candidate atoms and ions for frequency standards research using laser radiative cooling techniques", PROGRESS IN QUANTUM ELECTRONICS, PERGAMON PRESS, OXFORD, GB, vol. 8, no. 3-4, 1 January 1984 (1984-01-01), pages 249 - 255, XP025635622, ISSN: 0079-6727, [retrieved on 19840101]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated extension state (EPC)
BA ME RS
DOCDB simple family (publication)
EP 2261758 A1 20101215; EP 2261758 B1 20111207; AT E536573 T1 20111215; FR 2946766 A1 20101217; FR 2946766 B1 20110701; JP 2010286490 A 20101224; US 2010315173 A1 20101216; US 8183942 B2 20120522
DOCDB simple family (application)
EP 10165184 A 20100608; AT 10165184 T 20100608; FR 0953901 A 20090611; JP 2010132868 A 20100610; US 79661510 A 20100608