JPH0743536A - Light introducing mechanism for vacuum container - Google Patents

Abstract

PURPOSE:To reduce a scattered light noise generated when light is introduced into a vacuum container by arranging one terminal of a rod lens inside the vacuum container and the other terminal outside the vacuum container, connecting a receptacle to the rod lens, and connecting an optical fiber connector to the receptacle. CONSTITUTION:The wall of the vacuum container 1 is vacuum-sealed by the rod lens 5, and one terminal of the rod lens 5 is arranged inside the vacuum container 1, and the other terminal of the rod lens 5 outside the vacuum container 1. The receptacle 9 is provided by connecting to the outside of the rod lens 5, and the optical fiber connector 14 is connected to the receptacle 9, and an optical fiber 4 is connected to the rod lens 5 with the optical fiber connector 14. The light outputted from a light source 3 is introduced in the neighborhood of the vacuum container 1, and is made incident on the rod lens 5 by the optical fiber connector 14. Incident light is converted to collimate light 16 by the rod lens 5, and is introduced to the inside of the vacuum container 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light introducing mechanism for a vacuum container used in an atomic frequency standard, an atomic spectroscope and the like.

[0002]

2. Description of the Related Art Conventionally, in order to introduce light into a vacuum container, a light introducing mechanism as shown in FIG. 2 has been used. That is, the wall of the vacuum container 1 is vacuum-sealed by the window 2. The light output from the light source 3 is guided to the vicinity of the vacuum container 1 by the optical fiber 4 and converted into the collimated light 16 by the rod lens 5. Rod lens 5
Is attached to the rod lens holder 6 with a flange,
The flanged rod lens holder 6 is fixed to the vacuum container 1 by a flange mounting jig 7.

The collimated light 16 thus introduced into the vacuum chamber 1 excites the atomic beam or trapped atoms / ions 10. The excited atoms / ions 10 emit fluorescence 11. The fluorescent light 11 is converted into an electric signal by the photodetector 8 and is taken out as an output 13.

[0004]

However, when the collimated light 16 passes through the window, a part thereof is scattered on the surface of the window material. This scattered light 12 enters the photodetector 8 and becomes noise. When this light introduction mechanism is used in an atomic frequency standard, the noise due to the scattered light 12 deteriorates the SN ratio and deteriorates the frequency stability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light introducing mechanism for a vacuum container, which can reduce scattered light noise generated when light is introduced into the vacuum container. .

[0006]

In order to achieve the above object, a vacuum container light introducing mechanism of the present invention has a rod lens and a receptacle, one end of the rod lens is inside the vacuum container, and the other end is the vacuum chamber. Light is introduced into the inside of the vacuum container by arranging it outside the container, connecting the receptacle to the rod lens, and connecting an optical fiber connector to the receptacle.

[0007]

With the above means, in the present invention, since the rod lens itself that collimates the light emitted from the optical fiber is used for vacuum sealing, there is no scattered light on the surface of the window material, so noise due to scattered light is reduced. To do.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a light introducing mechanism according to an embodiment of the present invention.
Shown in. In FIG. 1, 1 is a vacuum container, 3 is a light source, 4 is an optical fiber, 5 is a rod lens, 8 is a photodetector, 9 is a receptacle, 10 is atoms / ions, 11 is fluorescence, 14 is an optical fiber connector, Reference numeral 15 is an output, and 16 is a collimated light. That is, the wall of the vacuum container 1 is vacuum-sealed by the rod lens 5, one end of the rod lens 5 is arranged inside the vacuum container 1, and the other end of the rod lens 5 is arranged outside the vacuum container 1. A receptacle 9 is connected and provided outside the rod lens 5. An optical fiber connector 14 is connected to the receptacle 9, and the optical fiber 4 is connected to the rod lens 5 by the optical fiber connector 14. Then, the light output from the light source 3 is guided to the vicinity of the vacuum container 1 by the optical fiber 4 and is incident on the rod lens 5 by the optical fiber connector 14. The light incident on the rod lens 5 is converted into collimated light 16 by the rod lens 5 and introduced into the vacuum chamber 1 to excite the atomic beam or trapped atoms / ions 10. The excited atoms / ions 10 emit fluorescence 11. The fluorescent light 11 is converted into an electric signal by the photodetector 8 and is taken out as an output 15.

[0010]

As described above, according to the present invention, it is possible to provide a vacuum container light introducing mechanism capable of reducing scattered light noise generated when light is introduced into the vacuum container.

Therefore, when the light introducing mechanism of the present invention is used in an atomic frequency standard, noise is reduced, so that the SN ratio is improved and the frequency stability is improved.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a light introducing mechanism for a vacuum container of the present invention.

FIG. 2 is a structural explanatory view showing a conventional light introducing mechanism for a vacuum container.

[Explanation of symbols]

1 ... Vacuum container, 2 ... Window, 3 ... Light source, 4 ... Optical fiber, 5
… Rod lens, 6… Flange rod lens holder,
7 ... Flange mounting jig, 8 ... Photodetector, 9 ... Receptacle, 14 ... Optical fiber connector.

Claims (1)

[Claims] 1. A rod lens and a receptacle, wherein one end of the rod lens is arranged inside a vacuum container and the other end is arranged outside the vacuum container, the rod lens is connected to the receptacle, and the receptacle is an optical fiber connector. A light introducing mechanism for a vacuum container, characterized in that light is introduced into the inside of the vacuum container by connecting the above.