| 摘要 |
An optical system of an atomic oscillator includes: a coherent light source emitting two resonant light components each having a p-polarized light component and an s-polarized light component, the tow resonant light components being coherent light and having a different frequency each other; a polarization splitter arranged at an output side of the coherent light source, the polarization splitter transmitting one of the p-polarized light component and the s-polarized light component and changes an optical path of the other of the p-polarized light component and the s-polarized light component to be outputted; a quarter-wave plate arranged at an output side of the polarization splitter so as to convert one of circularly polarized light and linearly polarized light to the other of circularly polarized light and linearly polarized light; a gas cell in which metal atom vapor is enclosed; a light guide that guides light after passing through the gas cell back to the gas cell as a turned-back light; and a photodetector that detects the turned-back light, the turned-back light having been passed through the gas cell and changed the optical path by the polarization splitter. The atomic oscillator controls an oscillation frequency by using a light absorption characteristic caused by a quantum-interference effect when the two resonant light components are incident on the optical system.
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