Quantum interference unit, quantum interference device, atomic oscillator, electronic apparatus, and moving object
View Patent ↗An atomic oscillator includes: a gas cell which houses metal atoms; a heater which adjusts a temperature of the gas cell; and a package which houses the gas cell and the heater. The package includes a non-magnetic metal layer.
1. A quantum interference unit comprising:
a gas cell which houses metal atoms;
a temperature adjustment element operatively associated with the gas cell to adjust a temperature of the gas cell; and
a package housing the gas cell and the temperature adjustment element, the package including a lid formed of a non-magnetic metal layer, wherein
the package further includes a coating layer coated over the non-magnetic metal layer, the coating layer being a different material than the non-magnetic metal layer, and
the coating layer contains a non-magnetic metal.
2. The quantum interference unit according to claim 1 , further comprising a coil which is arranged on an exterior of the package and applies a magnetic field to the metal atoms.
3. The quantum interference unit according to claim 2 , further comprising a magnetic shield which houses the package and the coil.
4. The quantum interference unit according to claim 1 , wherein an interior of the package is at a negative atmospheric pressure.
5. The quantum interference unit according to claim 4 , wherein a brazing material seals the lid of the package to a base.
6. The quantum interference unit according to claim 5 , wherein a melting point of the brazing material is below 300° C.
7. The quantum interference unit according to claim 5 , wherein the brazing material contains gold and tin.
8. The quantum interference unit according to claim 1 , wherein the coating layer contains phosphorus.
9. The quantum interference unit according to claim 8 , wherein a content of the phosphorus in the coating layer is 8% by weight or more.
10. The quantum interference unit according to claim 1 , wherein the coating layer contains palladium.
11. A quantum interference device comprising:
the quantum interference unit according to claim 1 ; and
a control unit controlling the quantum interference unit.
12. An atomic oscillator comprising:
the quantum interference unit according to claim 1 ; and
a control unit controlling the quantum interference unit.
13. An electronic apparatus comprising:
the quantum interference unit according to claim 1 ; and
a control unit controlling the quantum interference unit.
14. A moving object comprising:
the quantum interference unit according to claim 1 ; and
a control unit controlling the quantum interference unit.
15. A quantum interference unit comprising:
a gas cell which houses metal atoms;
a temperature adjustment element operatively associated with the gas cell;
a package housing the gas cell and the temperature adjustment element, the package including a base sealed to a lid with a brazing material; and
a coating layer coated over the lid, the coating layer being a different material than the lid,
wherein a non-magnetic metal layer extends along an entirety of the lid, and
the coating layer contains a non-magnetic metal.
16. The quantum interference unit according to claim 15 , wherein a melting point of the brazing material is below 300° C.