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US 12,613,496 B2Granted
Atomic clock system and frequency stabilization device
AssigneeShimadzu Corporation
InventorYusuke Hisai
Life of this patent
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Abstract
An atomic clock system comprises: a laser light source that outputs first laser light; a first atomic clock; a first optical modulator; a second optical modulator that receives laser light from the first optical modulator through an optical fiber, a reflection mechanism; a second atomic clock; a first frequency stabilization device; and a second frequency stabilization device.
Claims5
An atomic clock system comprising:
- a laser light source that outputs first laser light;
- a first atomic clock that operates using the first laser light;
- a first optical modulator that receives the first laser light;
- a second optical modulator that receives laser light from the first optical modulator through an optical fiber;
- a reflection mechanism that is disposed on an optical path between the optical fiber and the second optical modulator, and reflects a portion of laser light traveling through the optical fiber toward the second optical modulator to return the portion of the laser light to the optical fiber as feedback light;
- a second atomic clock that operates using second laser light output from the second optical modulator;
- a first frequency stabilization device disposed to configure a negative feedback circuit on an optical path between the laser light source and the first optical modulator;
- and
- a second frequency stabilization device disposed to configure a negative feedback circuit on an optical path between the second optical modulator and the second atomic clock, wherein
- the first frequency stabilization device uses the first laser light and the feedback light to remove fiber noise superimposed on the first laser light, and
- the second frequency stabilization device removes a noise of a high-frequency component superimposed on the second laser light.
8 more elements
A frequency stabilization device that stabilizes a frequency of laser light output from an output device, comprising:
- a phase modulation device that modulates a phase of the laser light output from the output device using a modulation signal;
- an optical resonator that resonates the laser light modulated by the phase modulation device;
- a photodetector that detects laser light output from the optical resonator;
- a phase comparator that calculates a comparison value between a detection signal of the photodetector and the modulation signal;
- a filter circuit that extracts an error signal including an error of a high-frequency component from the comparison value;
- and
- an adjustment circuit that uses the error signal extracted by the filter circuit to adjust the frequency of the laser light output from the output device.
4 more elements
Dependencies are inferred from the claim text.