Global Patent Index - EP 2473886 A1

EP 2473886 A1 20120711 - DEVICE FOR ATOMIC CLOCK

Title (en)

DEVICE FOR ATOMIC CLOCK

Title (de)

VORRICHTUNG FÜR ATOMUHR

Title (fr)

DISPOSITIF POUR HORLOGE ATOMIQUE

Publication

EP 2473886 A1 20120711 (FR)

Application

EP 10760897 A 20100901

Priority

  • EP 09405149 A 20090904
  • CH 11222010 A 20100709
  • CH 2010000215 W 20100901
  • EP 10760897 A 20100901

Abstract (en)

[origin: WO2011026252A1] The aim of the present invention is to provide a device for an atomic clock, enabling double passage into the gas cell without the disadvantages of the prior art. Said aim is achieved by a device for an atomic clock, including: a laser source (102) generating a laser beam; a quarter-wave plate (105) modifying the linear polarization of the laser beam into a circular polarization and vice versa; a gas cell (106) placed on the laser beam having a circular polarization; a mirror (107) sending the laser beam back toward the gas cell; a first photodetector (108a); as well as means (103, 101a, 107) for diverting the reflected beam of the laser source (102), characterized in that the device includes a second photodetector (109) placed behind the mirror (107), said mirror being semitransparent and allowing a portion of the laser beam to pass therethrough, said second photodetector (109) being used for controlling the optical frequency of the laser and/or for controlling the temperature of the cell (106).

IPC 8 full level

G04F 5/14 (2006.01)

CPC (source: EP)

G04F 5/14 (2013.01); G04F 5/145 (2013.01)

Citation (search report)

See references of WO 2011026252A1

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

DOCDB simple family (publication)

WO 2011026252 A1 20110310; EP 2473886 A1 20120711; EP 2473886 B1 20130529; US 2012256696 A1 20121011; US 8816779 B2 20140826

DOCDB simple family (application)

CH 2010000215 W 20100901; EP 10760897 A 20100901; US 201013394012 A 20100901