Patent ID: 9312871
Filing Date: 2016-04-12
CPC Classification: G04F,H03L

Claim Text:
1. A gas cell comprising: a body having a columnar through-hole, a recess and a groove, the columnar through-hole penetrating through the body from a first end to a second end of the body in a first direction, the recess being open to the first end of the body, and the groove interconnecting the columnar through-hole and the recess; a pair of windows bonded to the first and second ends of the body; an internal space being configured by the columnar through-hole, the recess, the groove and the pair of windows; 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%.