Atomic oscillator and its operating method
The atomic oscillator system enhances frequency stabilization by controlling laser light wavelength using a lock-in amplifier and feedback mechanism, addressing the issue of unmaximized CPT resonance in existing systems.
JP7874334B2Active Publication Date: 2026-06-16NEOARK CO LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NEOARK CO LTD
- Filing Date
- 2024-03-26
- Publication Date
- 2026-06-16
AI Technical Summary
Technical Problem
Existing atomic oscillators utilizing CPT resonance do not necessarily control the wavelength of laser light to maximize CPT resonance, which affects the stabilization of the oscillation frequency.
Method used
An atomic oscillator system with a laser light wavelength control unit that includes a lock-in amplifier and feedback mechanism to adjust the wavelength of laser light to maximize CPT resonance, using a second-harmonic synchronous signal to stabilize both the modulation frequency and optical carrier wavelength.
Benefits of technology
Improves the signal-to-noise ratio and stabilizes the oscillation frequency by maximizing CPT resonance through precise control of laser light wavelength.
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Abstract
To provide an atomic oscillator utilizing the CPT resonance, the atomic oscillator controlling a wavelength of a laser beam, which is incident to an alkali metal cell, in such a manner that CPT resonance becomes maximum.SOLUTION: An atomic oscillator comprises: a gas cell; a laser beam generation section for generating a laser beam, of which the frequency is modulated by a first modulation signal, and making the generated laser beam incident to the gas cell; a photodetection section which generates a detection signal corresponding to an intensity of the laser beam emitted from the gas cell; a local oscillator for generating a standard signal of which the frequency is controlled in accordance with the detection signal; a high frequency generator for generating the first modulation signal by modulating a phase of the standard signal using a second modulation signal; and a lock-in amplifier for processing the detection signal of the photodetection section using as a reference signal a double-frequency synchronizing signal which is synchronized to the second modulation signal and has a double frequency as high as that of the second modulation signal. The wavelength of the laser beam is controlled in accordance with an output signal of the lock-in amplifier.SELECTED DRAWING: Figure 4
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