| 摘要 |
An atomic oscillator includes: a gaseous alkali metal atom; a light source to generate a resonant light pair for generating an electromagnetically induced transparency phenomenon in the alkali metal atom; a high frequency generation unit that supplies a high frequency signal to the light source and generates the resonant light pair; a center frequency variable unit that supplies a direct current signal to the light source and varies a center frequency of the resonant light pair; a light detection unit that detects the resonant light pair transmitted through the alkali metal atom and outputs a detection signal corresponding to intensity of the transmitted resonant light pair; an absorption detection unit that detects a minimum value of the detection signal when the center frequency of the resonant light pair is varied; and a signal processing unit that controls supply or stop of the high frequency signal outputted from the high frequency generation unit, wherein the signal processing unit compares the minimum value detected by the absorption detection unit with the detection signal in a state where output of the high frequency signal is stopped, controls the center frequency variable unit to cause the detection signal to become larger than the minimum value by a specified value, and sets the center frequency of the resonant light pair, and the set center frequency is set to be lower than the center frequency of the resonant light pair corresponding to the minimum value.
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