US 12,244,320 B2
Atomic oscillator
Takahiro Fujisaku, Tokyo (JP); Kenta Matsumoto, Tokyo (JP); and Sota Kagami, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on May 23, 2023, as Appl. No. 18/200,850.
Claims priority of application No. 2022-088511 (JP), filed on May 31, 2022.
Prior Publication US 2023/0387926 A1, Nov. 30, 2023
Int. Cl. H03L 7/26 (2006.01); H01S 5/0687 (2006.01); H03B 17/00 (2006.01)
CPC H03L 7/26 (2013.01) [H01S 5/0687 (2013.01); H03B 17/00 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An atomic oscillator comprising:
a light generator configured to generate two excitation lights;
an alkali metal atom gas cell to which the two excitation lights are applied with a frequency difference therebetween being changed;
a detecting unit configured to detect an amount of a transmitted light having passed through the alkali metal atom gas cell; and
a control unit configured to measure a resonance frequency of an alkali metal atom gas based on the detected amount of the transmitted light and control an intensity ratio of the two excitation lights applied to the alkali metal atom gas cell based on the measured resonance frequency, wherein
the control unit is configured to measure the resonance frequency when the two excitation lights are applied to the alkali metal atom gas cell with the intensity ratio of the two excitation lights being changed and also a sum of intensities of the excitation lights being changed, and determine the intensity ratio of the two excitation lights based on a result of the measurement.