Gas cell, quantum interference device, atomic oscillator, electronic device, and moving object

Patent metadata

Field	Value
Publication number	US-9692432-B2
Application number	US-201615062579-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	Dec 20, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A gas cell includes an internal space in which metal atoms and a buffer gas are sealed. The buffer gas includes a gas mixture including nitrogen gas and argon gas. The mole fraction of the argon gas in the gas mixture is equal to or greater than 15% and equal to or less than 40%.

First claim

What is claimed is:

1. A gas cell comprising:
a body having a first recess, a second recess and a groove, the first recess being open to a first end of the body, and the groove interconnecting the first recess and the second recess;
a window bonded to the first end of the body;
an internal space being configured by the first recess, the second recess, the groove and the window;
metal atoms which are sealed in the internal space; and
a buffer gas which is sealed in the internal space,
wherein the buffer gas is a gas mixture including nitrogen gas and argon gas, and
a mole fraction of the argon gas in the gas mixture is in a range equal to or greater than 15% and equal to or less than 40%.

2. The gas cell according to claim 1 ,
wherein the mole fraction of the argon gas in the gas mixture is in a range equal to or greater than 20% and equal to or less than 37%.

3. The gas cell according to claim 1 ,
wherein the metal atoms are cesium atoms.

4. A quantum interference device comprising:
the gas cell according to claim 1 .

5. An atomic oscillator comprising:
the gas cell according to claim 1 .

6. An electronic device comprising:
the gas cell according to claim 1 .

7. A moving object comprising:
the gas cell according to claim 1 .

8. A gas cell comprising:
a body having a first recess, a second recess and a groove, the first recess being open to a first end of the body, and the groove interconnecting the first recess and the second recess;
a window bonded to the first end of the body;
an internal space being configured by the first recess, the second recess, the groove and the window;
metal atoms which are sealed in the internal space; and
a buffer gas which is sealed in the internal space,
wherein a distance between the window and a bottom of the first recess is equal to or less than 10 mm, and
a width of the body parallel to the window is equal to or less than 10 mm.

9. The gas cell according to claim 8 ,
wherein the buffer gas is a gas mixture including argon gas; and
wherein the mole fraction of the argon gas in the gas mixture is in a range equal to or greater than 20% and equal to or less than 37%.

10. The gas cell according to claim 9 ,
wherein the metal atoms are cesium atoms.

11. The gas cell according to claim 8 ,
wherein the metal atoms are cesium atoms.

Assignees

• Seiko Epson Corp

Inventors

• Yoshida Hiroyuki
• Tamura Tomohiro

Classifications

• H03L7/26 Primary

  using energy levels of molecules, atoms, or subatomic particles as a frequency reference · CPC title

• G04F5/14

  using atomic clocks · CPC title

• G04F5/145

  using Coherent Population Trapping · CPC title