Atomic oscillator

1. An atomic oscillator, comprising:

a gas cell in which a gaseous metal atom is sealed;

heating units heating the gas cell to a controlled temperature and being a first heater and a second heater;

a light source of exciting light exciting the metal atom in the gas cell;

a light detecting unit detecting the exciting light which has passed through the gas cell;

a substrate including at least a temperature controlling circuit for the heating units;

a first heater wiring coupling the first heater and the substrate;

a second heater wiring coupling the second heater and the substrate; and

a third heater wiring coupling the first heater and the second heater, wherein the gas cell includes a cylindrical portion, and windows which constitute an incident surface and an emitting surface on an optical path of the exciting light,

wherein the first heater and the second heater are respectively formed on the windows at an incident surface side and an emitting surface side and made of transparent heating materials, and

wherein the third heater wiring is formed on the cylindrical portion.

2. The atomic oscillator according to claim 1 , wherein the third heater wiring is made of a material same as a material of the first heater and the second heater.

3. The atomic oscillator according to claim 1 , wherein the third heater wiring is disposed so as to make a current direction of the first heater inverse to a current direction of the second heater.

4. The atomic oscillator according to claim 1 , wherein the light source is a coherent light source radiating coherent light, and an oscillation frequency is controlled by utilizing a light absorption property derived from quantum interference efficiency produced when two kinds of the coherent light as exciting light having different wavelengths from each other are made incident.