Light-emitting element module, atomic oscillator, and electronic apparatus

1. A light-emitting element module comprising:

a base that has a depression portion;

a light-emitting element that is accommodated in the depression portion and emits light; and

a lid that covers an opening of the depression portion and is joined to the base,

wherein the lid includes

a protrusion portion having a hole through which the light passes and protruding to an opposite side to the base and

a window blocking the hole and passing the light, and

wherein a surface of the window on a side of the light-emitting element is inclined with respect to a surface perpendicular to an optical axis of the light.

2. The light-emitting element module according to claim 1 ,

wherein an inclination angle of the surface of the window with respect to the surface perpendicular to the optical axis of the light is equal to or greater than 5° and equal to or less than 45°.

3. The light-emitting element module according to claim 1 ,

wherein the lid includes

a first portion supportings the protrusion portion, and

a second portion joined to the base and having a thickness thinner than the first portion.

4. The light-emitting element module according to claim 3 ,

wherein at least a part of an outer circumferential surface of the protrusion portion has a shape formed along an external shape of the first portion when viewed in a direction along the optical axis of the light.

5. The light-emitting element module according to claim 1 ,

wherein an inner wall surface of the hole of the protrusion portion includes a stepped portion that is inclined with respect to the surface perpendicular to the optical axis of the light and supports the window.

6. The light-emitting element module according to claim 1 ,

wherein when W [mm] is a width of the light on a surface along the opening of the hole on the side of the base at an intensity of 1/e 2 (where e is a base of natural logarithm) of a peak intensity of the light, a width L [mm] of the opening of the hole on the side of the base satisfies W<L<20×W.

7. The light-emitting element module according to claim 1 ,

wherein a center of the window deviates from the optical axis of the light.

8. The light-emitting element module according to claim 7 ,

wherein a side surface of the window is located further outward than a light flux of the light.

9. An atomic oscillator comprising:

a light-emitting element module comprising

a base that has a depression portion;

a light-emitting element that is accommodated in the depression portion and emits light; and

a lid that covers an opening of the depression portion and is joined to the base,

wherein the lid includes

a protrusion portion having a hole through which the light passes and protruding to an opposite side to the base and

a window blocking the hole and passing the light, and

wherein a surface of the window on a side of the light-emitting element is inclined with respect to a surface perpendicular to an optical axis of the light.

10. The atomic oscillator according to claim 9 , further comprising:

an optical element that passes the light; and

a holder that holds the optical element and has a through-hole into which the protrusion portion is inserted.

11. The atomic oscillator according to claim 10 ,

wherein the window is disposed between the light-emitting element and the optical element,

wherein a surface of the optical element on a side of the window is inclined with respect to a surface perpendicular to an optical axis of the light, and

wherein a center of the optical element deviates from the optical axis of the light.

12. An electronic apparatus comprising:

the light-emitting element module according to claim 1 .