JPH03139889A - Rubidium atom oscillator - Google Patents

Abstract

PURPOSE:To improve the S/N ratio of a photomicrowave resonance part by providing a the photomicrowave resonance part with a concave reflecting plate concentric with a rubidium lamp, a first lens for condensing the light from the rubidium lamp, and a second lens for condensing the light for a rubidium gas cell. CONSTITUTION:Approximately half of the light form a rubidium lamp 3 reaches a lens 4 directly, and a great portion of remaining light reaches a lens 4, being reflected in the same direction as incident light by a circular reflecting plate 2 concentric with the rubidium lamp 3. The luminous flux condensed by the lens 4 reaches a lens 6 while diverging, after converging at a point right before the opening for letting light in a cavity 5. The lens 6 changes the luminous flux into parallel flux so that the light may be supplied efficiently to a rubidium gas cell 7, and this parallel flux reaches a solar battery 8 as it is after passing the rubidium cell 7. Accordingly, by supplying microliquid to a microwave introduction part 9, favorable atom resonance properties can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rubidium atomic oscillator, and particularly to the structure of an optical microwave resonance part of a rubidium atomic oscillator using an optical bombing method.

[Conventional technology]

The optical microwave resonance part in a conventional rubidium atomic oscillator is composed of a cavity part and a lamp part, and the cavity part is a cylindrical cavity that resonates with input microwaves (approximately 6°8 GHz).A rubidium gas cell is inserted into the cylindrical cavity. The rubidium gas cell is irradiated with light from a rubidium lamp within the lamp section, and is configured to cause atomic resonance with the incident light and input microwaves.

[Problem to be solved by the invention]

The performance of the rubidium atomic oscillator described above is greatly influenced by the S/N ratio of the optical microwave resonance part, and this S/N
In order to improve the ratio, it is necessary that the rubidium gas cell be irradiated with sufficient light. In conventional rubidium atomic oscillators, the operating temperature ranges of the rubidium lamp section and the cavity section are different, so the lamp section and the cavity section are separated, and the cavity needs to generate a mode at 6.8 GHz. It is difficult to make a large hole for light entry in the cavity. For this reason, most of the light from the rubidium lamp is lost before reaching the rubidium gas cell, and there are some areas of the rubidium gas cell that are exposed to light. For this reason, there is a drawback that the S/N ratio of the optical microwave resonance part is reduced.

An object of the present invention is to provide a rubidium atomic oscillator that eliminates such drawbacks and improves the S/N ratio of the optical microwave resonance section.

[Means to solve the problem]

The structure of the present invention includes a rubidium atom having an optical microwave resonator including a lamp house that accommodates a rubidium lamp, and a cavity that accommodates a rubidium gas cell that transmits light from the rubidium lamp and that resonates with an input microwave signal. In the oscillator, a concave reflector disposed in the lamp house concentrically with the rubidium lamp, and a first lens provided to condense light from the concave reflector and the rubidium lamp; It is characterized by comprising a second lens that condenses the light from the first lens and supplies it to the rubidium gas cell as substantially parallel light.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of an optical microwave resonance section according to an embodiment of the present invention. In this embodiment, about half of the light from the rubidium lamp 3 directly reaches the lens 4, and most of the remaining light is reflected by the rubidium lamp 3 and the concentric circular reflection plate 2 in the same direction as the incident light. reach. The light beam condensed by this lens 4 is focused just before the light entrance hole of the cavity 5, and then reaches the lens 6 while being diffused.

In order to efficiently supply light to the rubidium gas self, this lens 6 converts the light beam into a parallel beam, and after passing through the rubidium gas self, this parallel beam reaches the solar cell 8 as it is.

In this way, the light from the rubidium lamp 3 is efficiently focused, passes through the entire rubidium gas self as a parallel beam, and is supplied to the solar cell 8, so that microwaves can be supplied to the microwave introducing section 9. This makes it possible to obtain good atomic resonance characteristics.

〔Effect of the invention〕

As explained above, the present invention includes a concave reflector concentric with the rubidium lamp in the optical microwave resonance part, a first lens that focuses light from the rubidium lamp, and a concave reflector that focuses light on the rubidium gas cell. By having the second lens, the light from the rubidium lamp can be effectively supplied to the rubidium gas cell, so the S/
It is possible to improve the N ratio. Therefore, compared to conventional rubidium atomic oscillators, it is possible to obtain a rubidium atomic oscillator with higher performance and frequency stability.

FIG. 1 is a schematic cross-sectional view of an optical microwave resonance section according to an embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1... Lamp house, 2... Reflection plate, 3... Rubidium lamp, 4.6... Lens, 5... Cavity, 7... Rubidium gas cell, 8... Solar cell,
9...Microwave introduction section.

Claims (1)

[Claims] In the rubidium atomic oscillator, the rubidium atomic oscillator has an optical microwave resonator including a lamp house that accommodates a rubidium lamp, and a cavity that accommodates a rubidium gas cell that transmits light from the rubidium lamp and that resonates with an input microwave signal. a concave reflector disposed concentrically with the rubidium lamp; a first lens provided to condense light from the concave reflector and the rubidium lamp; a second lens that condenses the light and supplies it to the rubidium gas cell as substantially parallel light.