Quantum interference device, an atomic oscillator, an electronic apparatus, and a vehicle
A quantum interference device includes an atom cell module including an atom cell in which alkali metal is encapsulated, a light source that emits light adapted to excite the alkali metal, and a heater that heats the atom cell and the light source, a package that houses the atom cell module, and a controller adapted to control drive of the heater so that the light source becomes at a set temperature, R≤(Tv−Tout)/Qv is satisfied, where R [° C./W] is a thermal resistance between the atom cell module and the package, Tv [° C.] is the set temperature, Tout [° C.] is an upper limit value of a usage environmental temperature set to a value lower than the set temperature, Qv [W] is an amount of heat generation of the light source.
1. A quantum interference device comprising:
an atom cell module including an atom cell in which alkali metal is encapsulated, a light source that emits light adapted to excite the alkali metal, and a heater that heats the atom cell and the light source;
a package that houses the atom cell module; and
a controller adapted to control drive of the heater so that the light source becomes at a set temperature,
wherein the following is satisfied:
R<(Tv−Tout)/Qv
where R [° C./W] is a thermal resistance between the atom cell module and the package, Tv [° C.] is the set temperature, Tout [° C.] is an upper limit value of a usage environmental temperature set to a value lower than the set temperature, Qv [W] is an amount of heat generation of the light source.
2. The quantum interference device according to claim 1 , the atom cell module further comprising:
a support disposed between the atom cell and the package, and
a first interconnection substrate having flexibility and including a first interconnection that electrically connects the light source and the package to each other, and wherein
a thermal resistance of the support is lower than a thermal resistance of the first interconnection substrate.
3. The quantum interference device according to claim 1 , wherein
R 1 /R 2 is equal to or more than 0.5 and equal to or less than 2.0,
Where R 1 [° C./W] is a thermal resistance due to solid heat conduction between the atom cell module and the package, and R 2 [° C./W] is a thermal resistance due to radiation between the atom cell module and the package.
4. The quantum interference device according to claim 3 , wherein
the R 1 is smaller than the R 2 .
5. The quantum interference device according to claim 3 , wherein
the R 1 is larger than the R 2 .
6. The quantum interference device according to claim 2 , the atom cell module further comprising:
a photodetector that detect the light, and
a second interconnection substrate having flexibility and including a second interconnection that electrically connects the photodetector and the package to each other, and wherein
a thermal resistance of the first interconnection is lower than a thermal resistance of the second interconnection.
7. The quantum interference device according to claim 1 , wherein
the R is not smaller than 3000 [° C./W].
8. The quantum interference device according to claim 1 , wherein
a pressure in the package is not higher than 1 Pa.
9. An electronic apparatus comprising:
the quantum interference device according to claim 1 .
10. A vehicle comprising:
the quantum interference device according to claim 1 .