JP2008206001A - Lamp exciter and atomic oscillator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp exciter which has improved characteristics in variation of light emission intensity, lighting durability and lighting re-initiation and reduces, as much as possible, factors blocking miniaturization of the oscillator. <P>SOLUTION: A lamp exciter 2A, 2B comprises:a rubidium lamp 5 including a lamp body 5b in which a rubidium metal is sealed, and a metal pool 5a protruded outside from a suitable part of the lamp body 5b in order to store the rubidium metal that is not completely vaporized within the lamp body 5b; an exciting coil L for applying a high frequency electromagnetic field to the rubidium lamp 5; a capacitor C which is connected in series to the exciting coil L to form a resonance circuit; and an oscillation section 1 which supplies a high frequency signal to the resonance circuit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lamp exciter and an atomic oscillator, and more particularly to a configuration of a lamp exciter for stably exciting a rubidium lamp.

  In recent years, digital networks such as communication networks and broadcasting networks have been developed, and accordingly, a highly accurate and highly stable oscillator is required as a clock source used for generating clock signals for transmission devices and reference frequencies for broadcasting stations. It has become indispensable. As an oscillator that satisfies such a demand, a rubidium atomic oscillator having high oscillation frequency accuracy and stability is often used. In recent years, the demand for miniaturization of atomic oscillators has increased, and there is an urgent need to miniaturize the whole including the optical microwave unit (OMU unit).

FIG. 10A is a schematic diagram of a conventional lamp exciter. In the rubidium lamp 5, as shown in the figure, in order to store the rubidium metal that cannot be vaporized in the rubidium lamp body, a metal reservoir 5a is protruded to the outside from a suitable place of the rubidium lamp body. In order to design the oscillator in a small size, the metal reservoir 5a is disposed on the side surface of the rubidium lamp 5, and the coil L is wound around the outer periphery of the rubidium lamp so that the axial direction is horizontal. As a result, the optical path 14 of the rubidium light emitted from the rubidium lamp 5 is formed along the horizontal direction. Further, the metal reservoir 5a is arranged so as not to enter the coil L as much as possible so that the AC electromagnetic field generated from the coil L for supplying the lighting energy is not disturbed, so that metal is not present in the coil as much as possible. Placed in.
As a conventional technique, Patent Document 1 discloses a lamp exciter for a rubidium atomic oscillator that prevents a decrease in excitation light emission intensity caused by metal rubidium condensing and adhering to the excitation light extraction side of the lamp.
Japanese Patent Laid-Open No. 1-158785

However, in the conventional configuration shown in FIG. 10 (a), the rubidium metal adheres in the metal gravity direction <vertical downward direction] as a long-term change during light emission. Therefore, since rubidium metal enters the inside of the coil, the AC electromagnetic field generated from the coil for supplying the lighting energy is obstructed, and the fluctuation of the emission intensity, the persistence of the lighting, and the characteristics of the lighting restart are deteriorated. There is a problem.
In order to prevent this, if the metal reservoir 5a is disposed on the gravity direction <vertical downward direction> side and the coil L is disposed on the upper side of the rubidium lamp 5 as shown in FIG. There is a problem that the size of the oscillator is hindered because the width is taken in the direction.
Moreover, the prior art currently disclosed by patent document 1 has the same subject as Fig.10 (a).
This invention is made | formed in view of this subject, arrange | positions a rubidium lamp so that a metal reservoir part may be located below, and is a horizontal direction of a rubidium lamp crossing with respect to the vertical straight line which passes along a metal reservoir part. Providing a lamp exciter that improves the emission intensity fluctuation, lighting sustainability, and lighting restart characteristics by arranging the coils so as to form an optical path, while minimizing the obstruction of miniaturization of the oscillator The purpose is to do.

  In order to solve this problem, the present invention includes a lamp body enclosing rubidium metal, and a metal reservoir portion protruding outward from a proper position of the lamp body in order to store rubidium metal that cannot be vaporized in the lamp body. In addition, a rubidium lamp that emits rubidium light toward the gas cell, an excitation coil that supplies a high-frequency electromagnetic field to the rubidium lamp, a capacitive element that is connected in series to the excitation coil to form a resonance circuit, and the resonance circuit An oscillator for supplying a high-frequency signal, wherein the rubidium lamp is arranged so that the metal reservoir faces downward, and intersects with a straight line penetrating the metal reservoir vertically. The excitation coil is arranged so that an optical path of the rubidium light is formed in a direction in which the light is emitted.

  The lamp exciter forms a resonance circuit with a coil that supplies a high-frequency electromagnetic field to a rubidium lamp and a capacitive element connected in series with the coil. Therefore, by supplying a signal having a frequency tuned to the resonance frequency of the resonance circuit from the oscillator, the rubidium metal enclosed in the rubidium lamp is excited to emit rubidium light. In addition, the rubidium lamp has a protrusion called a metal reservoir for storing rubidium metal that cannot be completely vaporized. However, if the side surface of the lamp body is selected as the position of the metal reservoir, the rubidium metal adheres in the direction of gravity of the metal as a long-term change during light emission. Therefore, since rubidium metal enters the inside of the coil, the AC electromagnetic field generated from the coil for supplying the lighting energy is obstructed, and the fluctuation of the emission intensity, the persistence of the lighting, and the characteristics of the lighting restart are deteriorated. There is a problem. Therefore, in the present invention, the rubidium lamp is disposed so that the metal reservoir portion faces downward, and the excitation coil is disposed so that an optical path is formed in a direction intersecting with a straight line penetrating the metal reservoir portion in the vertical direction. is there. As a result, fluctuations in emission intensity, lighting sustainability, and lighting restart characteristics can be improved, and the obstruction factors for downsizing of the oscillator can be reduced as much as possible.

Further, when the excitation coil is arranged so that a straight line passing through the metal reservoir portion in the vertical direction intersects the high-frequency electromagnetic field, one axial end of the excitation coil is brought into contact with a side surface of the lamp body. It arrange | positions so that it may contact | connect.
The excitation coil excites atoms to emit light by supplying an electromagnetic field to the internal rubidium metal from the outside of the rubidium lamp. Therefore, it is not necessary to wind a coil around the rubidium lamp, and light can be emitted by bringing the coil close to the rubidium lamp body. In the present invention, an electromagnetic field is supplied by bringing one axial end of the coil into contact with the lamp body. Thereby, a coil is comprised by another body, a lamp exciter can be comprised by arrange | positioning in the suitable place of a lamp | ramp at the time of an assembly, and a manufacturing man-hour can be reduced.

The capacitive element may be connected to one axial end of the excitation coil.
When a resonance circuit is formed by a capacitive element and an excitation coil, a contact point connecting the capacitive element and the excitation coil has a highest resonance voltage called a hot end, and the light emission intensity at that portion is increased. Further, when the excitation coil is brought into contact with the lamp body, light is emitted from the rubidium lamp. Therefore, it is preferable to connect the capacitive element to one axial end portion of the excitation coil close to the contact surface. Thereby, the emitted light can be utilized to the maximum extent.

In addition, the excitation coil is wound around the lamp body so that the straight line penetrating the metal reservoir portion in the vertical direction and the high-frequency electromagnetic field are parallel to each other, and intersects the straight line penetrating the metal reservoir portion in the vertical direction. A part of the excitation coil is coarsely wound so that the optical path is formed in the direction of the rotation.
In order to excite rubidium atoms most efficiently, it is effective to uniformly wind the excitation coil around the lamp body. However, in the case where the metal reservoir portion is disposed below, the direction in which light is emitted is upward as it is. In the present invention, it is necessary to form the optical path in a direction intersecting with a straight line penetrating the metal reservoir in the vertical direction, but the excitation coil obstructs the optical path. Therefore, in the present invention, the coil of the portion that becomes the optical path is roughly wound, and the gap is used as the optical path. This makes it possible to excite rubidium atoms most efficiently and to achieve miniaturization.

In addition, the excitation coil is wound around the lamp body so that the straight line penetrating in the metal reservoir portion in the vertical direction intersects the high-frequency electromagnetic field, and the capacitive element is approximately 2/1 of the number of turns of the excitation coil. It is characterized in that it is connected in series at the position of and located in the vicinity of the metal reservoir.
When the excitation coil is wound around the lamp body, it is necessary to wind so that the metal reservoir does not enter the excitation coil. For this purpose, the metal pool portion is avoided and the metal pool portion is wound symmetrically with respect to a straight line penetrating in the vertical direction. In this case, the metal reservoir portion becomes a dead space, and it is important to effectively use this portion for miniaturization. Therefore, in the present invention, a capacitive element is connected to the center of the excitation coil wound symmetrically and disposed in the dead space. As a result, the rubidium atoms can be excited most efficiently, and the capacitive element can be effectively arranged to achieve downsizing.

In addition, the excitation coil is wound around the lamp body so that the straight line penetrating in the vertical direction in the metal reservoir portion and the high-frequency electromagnetic field intersect, and the rubidium light is emitted to the gas cell disposed in the vicinity of the excitation coil. A capacitor element is arranged.
By making the optical path side a hot end, light can be emitted more efficiently. In the case of the present invention, since one axial end portion of the excitation coil serves as an optical path, the capacitive element is arranged so that that portion serves as a hot end. As a result, rubidium atoms can be excited most efficiently and light on the optical path side can be efficiently emitted.

The excitation coil is wound around the lamp body at a predetermined inclination angle with respect to a straight line penetrating the metal reservoir portion in the vertical direction, and one of the excitation coils intersects with a straight line penetrating the metal reservoir portion in the vertical direction. The optical path is formed in a direction.
In the present invention, the excitation coil is wound obliquely with respect to a straight line penetrating the metal reservoir in the vertical direction, and the direction where the excitation coil is not wound is used as the optical path. Thereby, winding of an excitation coil is simplified and an assembly man-hour can be reduced.

An atomic oscillator that controls an oscillation frequency by using a light absorption characteristic according to a microwave frequency of incident light from a rubidium light source, comprising: the lamp exciter according to any one of claims 1 to 7; And a cavity resonator that resonates in the vicinity of the resonance frequency of the rubidium atom, and a gas cell in which the rubidium atom is sealed.
By using the lamp exciter of the present invention, the metal reservoir is disposed below. The rubidium light is incident on the gas cell using a direction substantially orthogonal to a straight line penetrating the metal reservoir portion in the vertical direction. As a result, it is possible to provide an atomic oscillator that improves the emission intensity variation, lighting sustainability, and lighting restart characteristics, and realizes downsizing of the optical microwave unit.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1A is a schematic diagram of a lamp exciter according to the first embodiment of the present invention, and FIG. 1B is a schematic diagram of a lamp exciter according to the second embodiment of the present invention. The lamp exciters 2A and 2B include a lamp main body 5b enclosing rubidium metal and a metal reservoir portion 5a protruding outward from a proper position of the lamp main body 5b in order to store rubidium metal that cannot be vaporized in the lamp main body 5b. In addition, a rubidium lamp 5 that emits rubidium light toward a gas cell (not shown), an excitation coil L that supplies a high-frequency electromagnetic field to the rubidium lamp 5, and a capacitive element C that is connected in series to the excitation coil L to form a resonance circuit And an oscillating unit 1 for supplying a high-frequency signal to the resonance circuit.

When the excitation coil L is arranged so that the straight line 16 (hereinafter simply referred to as the straight line 16) that penetrates the metal reservoir 5a in the vertical direction and the high-frequency electromagnetic field 17 intersect, one end of the excitation coil L in the axial direction. The portion La is arranged so as to contact the side surface of the lamp body 5b.
That is, the lamp exciters 2A and 2B form a resonance circuit by the coil L for applying the high-frequency electromagnetic field 17 to the rubidium lamp 5 and the capacitive element C connected in series with the coil L. Therefore, by supplying an oscillation signal tuned to the resonance frequency of this resonance circuit from the oscillator 1, the rubidium metal enclosed in the rubidium lamp 5 is excited to emit light. Further, the rubidium lamp 5 has a protruding portion called a metal reservoir portion 5a for storing rubidium metal that cannot be completely vaporized. However, when the rubidium lamp 5 is arranged so that the straight line 16 is horizontal, the rubidium metal adheres to the metal in the gravitational direction as a long-term change during light emission. As a result, rubidium metal enters the inside of the excitation coil 5, thereby inhibiting the AC electromagnetic field 17 generated from the excitation coil 5 for supplying the lighting energy, and changing the emission intensity, the lighting sustainability, and the lighting restart. There is a problem such as deteriorating the characteristics. Therefore, in the present embodiment, the rubidium lamp 5 is disposed so that the metal reservoir portion 5a faces downward, and the excitation coil L is disposed so that the optical path 14 is formed in a direction intersecting the straight line 16. As a result, fluctuations in emission intensity, lighting sustainability, and lighting restart characteristics can be improved, and the obstruction factors for downsizing of the oscillator can be reduced as much as possible.

  The excitation coil L excites atoms to emit light by supplying an electromagnetic field 17 from the outside of the rubidium lamp 5 to the internal rubidium metal. Therefore, it is not necessary to wind the excitation coil L around the rubidium lamp 5, and light can be emitted by bringing the excitation coil L close to the lamp body 5b. Further, since the electromagnetic field 17 is supplied by bringing one axial end La of the excitation coil L into contact with the lamp body 5b, the excitation coil L is configured as a separate body and placed at an appropriate position of the rubidium lamp 5 during assembly. By arranging the lamp exciters, the lamp exciters 2A and 2B can be configured, and the number of manufacturing steps can be reduced.

In the first embodiment shown in FIG. 1A, the capacitive element C is disposed on the one axial end portion La side of the excitation coil L, and the side surface of the lamp body 5b facing the one axial end portion La side is arranged. This is the optical path 14. That is, when a resonance circuit is formed by the capacitive element C and the excitation coil L, the connection point h between the capacitive element C and the excitation coil L is referred to as a hot end, and the resonance voltage becomes the highest, and light emission at that portion becomes strong. Further, when the excitation coil L is brought into contact with the lamp body 5b, light is emitted from the rubidium lamp 5. Since the light is emitted from the entire surface of the rubidium lamp 5, it is preferable that there is no obstacle on the optical path 14 side. Therefore, in the present embodiment, the opposite side where the excitation coil L is disposed is the optical path 14. Thereby, the emitted light can be utilized to the maximum extent.
In the second embodiment shown in FIG. 1B, the capacitive element C is disposed on one axial end portion La side of the excitation coil L, and the one axial end portion La side is used as the optical path 14. It is. That is, a gas cell (not shown) is disposed on the optical path 14 side, and receives light emitted from the rubidium lamp 5 to absorb light. Further, in order to reduce the size of the lamp exciter 2B, it is necessary to reduce a useless space as much as possible. Therefore, in the present embodiment, light is allowed to pass through the use of the fact that the central portion of the excitation coil L is an air core. Thereby, the whole optical microwave unit can be reduced in size.

FIG. 2A is a schematic diagram of a lamp exciter according to the third embodiment of the present invention, and FIG. 2B is a schematic diagram of a lamp exciter according to the fourth embodiment of the present invention. The lamp exciters 2C and 2D are excited so that the excitation coil L is wound around the lamp body 5b so that the straight line 16 and the high-frequency electromagnetic field 17 are in parallel, and the optical path 14 is formed in a direction intersecting the straight line 16. A part of the coil L is coarsely wound. In FIG. 2A, the optical path 14 is secured by opening the excitation coil on the optical path 14 side by an angle θ. On the other hand, FIG. 2 (b) secures the optical path 14 by roughly winding both sides of the excitation coil in the optical path 14 portion.
That is, in order to excite rubidium atoms most efficiently, the excitation coil L is uniformly wound around the lamp body 5b. However, when the metal reservoir 5a is disposed below, the direction in which light is emitted is upward as it is. In this embodiment, it is necessary to form the optical path 14 in a direction intersecting with the straight line 16, but the excitation coil L obstructs the optical path. In view of this, the coil of the portion that becomes the optical path 14 is opened or coarsely wound, and the gap is used as the optical path 14. This makes it possible to excite rubidium atoms most efficiently and to achieve miniaturization.

FIG. 3A is a schematic diagram of a lamp exciter according to the fifth embodiment of the present invention. In the lamp exciter 2E, the excitation coil L is wound around the lamp body 5b so that the straight line 16 and the high-frequency electromagnetic field 17 intersect with each other, and the capacitive element C is connected in series at a position approximately 2/1 of the number of turns of the excitation coil L. And is disposed in the vicinity of the metal reservoir 5a.
That is, when the excitation coil L is wound around the lamp main body 5b, it is necessary to wind so that the metal pool portion 5a does not enter the excitation coil L. For that purpose, the metal pool part 5a is avoided and it winds symmetrically with respect to the straight line 16. In that case, the portion of the metal reservoir 5a becomes a dead space, and it is important to effectively use this portion for miniaturization. Therefore, in the present embodiment, the capacitive element C is connected to the center of the excitation coils Lb and Lc wound symmetrically and arranged in the dead space. As a result, the rubidium atoms can be excited most efficiently, and the capacitive element C can be effectively arranged to achieve downsizing. The optical path 14 at this time is one axial end of the excitation coil Lc.

FIG. 3B is a schematic diagram of a lamp exciter according to the sixth embodiment of the present invention. The lamp exciter 2F has an excitation coil L wound around the lamp body 5b so that the straight line 16 and the high-frequency electromagnetic field 17 intersect, and has a capacitance on one axial end portion La side of the excitation coil on the side that becomes the optical path 14. The element C is arranged.
That is, by making the optical path 14 side a hot end, light can be emitted more efficiently. In the present embodiment, since one axial end portion La of the excitation coil L becomes the optical path 14, the capacitive element C is arranged so that that portion becomes a hot end. As a result, the rubidium atoms can be excited most efficiently and the light on the optical path 14 side can be efficiently emitted.

FIGS. 4A and 4B are schematic views of a lamp exciter according to the seventh embodiment of the present invention. The lamp exciters 2G and 2H wind the excitation coil L around the lamp body 5b at a predetermined angle β with respect to the straight line 16, and form an optical path 14 in one direction (right side in this figure) intersecting the straight line 16. To do. The excitation coil L may be wound from the metal reservoir 5a side or from the opposite side of the metal reservoir 5a.
That is, in the present embodiment, the excitation coil L is wound obliquely with respect to the straight line 16, and the direction where the excitation coil L is not wound is used as an optical path. Thereby, the winding of the excitation coil L is simplified and the number of assembling steps can be reduced.

FIG. 5 is a schematic diagram of a lamp exciter according to an eighth embodiment of the present invention. The lamp exciter 2I is arranged such that the lamp body 5b is inclined with respect to the optical path 14 by a predetermined angle θ. In the sense of emphasizing the characteristics, it is ideal to install the metal reservoir 5a facing downward. However, when there is a restriction in the height direction, it is also one method to install the lamp body 5b with an inclination of about 45 degrees as in this embodiment. Thereby, progress to the downward direction of a rubidium metal can be delayed, keeping the restrictions of a height direction.
FIG. 6 is a schematic diagram of a lamp exciter according to the ninth embodiment of the present invention. In the lamp exciter 2J, the arrangement direction of the conventional lamp exciter is arranged so that the metal reservoir portion 5a faces downward. Since the optical path 14 at this time is above the lamp body 5b, it is effective in the case of a vertical atomic oscillator in which the gas cell is disposed on the rubidium lamp 5.

FIG. 7 is a schematic view of a lamp exciter according to the tenth embodiment of the present invention. This lamp exciter 2K is arranged so that the metal reservoir 30a of the cylindrical rubidium lamp 30 is located downward, and the capacitive element C is connected to the center of the exciting coils La and Lb that are wound symmetrically up and down. The central portion of 30 is the optical path 14. This embodiment is effective when using a conventional cylindrical rubidium lamp as it is to improve the performance.
FIG. 8 is a block diagram showing a schematic configuration of a rubidium atomic oscillator using the lamp exciter of the present invention. The rubidium atomic oscillator 100 includes an oscillation unit 1 that supplies a high-frequency signal to the lamp exciter 2, a lamp exciter 2 for lighting a rubidium lamp (hereinafter referred to as an Rb lamp) 5, and an Rb filled with rubidium gas. Gas cell 6, microwave resonator 3 that is excited by the resonance frequency of rubidium atoms in Rb gas cell 6, radiation antenna 4 that radiates microwaves to microwave resonator 3, and intensity of light transmitted through Rb gas cell 6 , A phase discriminator 10 for discriminating the phase of the low frequency amplitude modulation signal appearing in Amp 9, a low frequency phase signal generator 11 for modulating the phase of the microwave by low frequency, and a voltage controlled crystal oscillator A frequency-multiplying / synthesizing unit 12 that multiplies thirteen oscillation signals into microwaves, and a predetermined frequency based on the voltage of the phase discriminator That a voltage controlled crystal oscillator 13 is configured to include a. A unit constituted by the lamp exciter 2, the microwave resonator 3, and the photosensor 7 is referred to as an optical microwave unit 8. The output of the frequency multiplication / synthesis modulator 12 is connected to the radiation antenna 4.

Next, since the operation of the rubidium atomic oscillator of the present invention is known, the description thereof will be omitted here, but the outline of the microwave resonator 3 which is the main component of the present invention will be described.
In the operation process of the rubidium atomic oscillator, the presence of microwaves for dropping the electrons in the higher order (F = 2) than the energy order (F = 1) in the steady state to the order of F = 1 operates as an atomic oscillator. In order to sufficiently increase the intensity of the microwave, a microwave resonator is used. The microwave resonator is designed to transmit 6.83468 ·· GHz from the radiation antenna 4 attached in the microwave resonator 3 and to tune to this frequency.
FIG. 9 is a diagram illustrating an example of a circuit diagram illustrating a connection relationship between the lamp exciter and the oscillation unit. The oscillator 1 may be basically any type, but is generally configured as a Colpitts oscillation circuit. In the lamp exciter 2, the series resonance circuit of the excitation coil L and the capacitive element C is connected to the base side of the oscillation transistor Tr of the Colpitts oscillator 1. The excitation coil L is wound around the rubidium lamp 5 as described above, and the rubidium light 14 is emitted therefrom.

(A) is a schematic diagram of the lamp exciter which concerns on the 1st Embodiment of this invention, (b) is a schematic diagram of the lamp exciter which concerns on the 2nd Embodiment of this invention. (A) is a schematic diagram of the lamp exciter which concerns on the 3rd Embodiment of this invention, (b) is a schematic diagram of the lamp exciter which concerns on the 4th Embodiment of this invention. (A) is a schematic diagram of the lamp exciter which concerns on the 5th Embodiment of this invention, (b) is a schematic diagram of the lamp exciter which concerns on the 6th Embodiment of this invention. (A) and (b) are schematic diagrams of a lamp exciter according to a seventh embodiment of the present invention. It is a schematic diagram of the lamp exciter which concerns on the 8th Embodiment of this invention. It is a schematic diagram of the lamp exciter which concerns on the 9th Embodiment of this invention. It is a schematic diagram of the lamp exciter which concerns on the 10th Embodiment of this invention. It is a block diagram which shows schematic structure of the rubidium atomic oscillator using the lamp exciter of this invention. It is a figure which shows an example of the circuit diagram which shows the connection relation of a lamp exciter and an oscillation part. (A) and (b) are schematic diagrams of a conventional lamp exciter.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Oscillator, 2 lamp exciter, 3 microwave resonator, 4 radiation antenna, 5 rubidium lamp, 6 rubidium gas cell, 7 photo sensor, 8 optical microwave unit, 9 Amp, 10 phase discriminator, 11 low frequency phase Signal generator, 12 frequency multiplication / synthesis modulator, 13 voltage controlled crystal oscillator, 14 optical path, 100 rubidium atomic oscillator, L excitation coil, C capacitive element

Claims (8)

A rubidium having a lamp body enclosing rubidium metal, and a metal reservoir portion protruding outward from a proper position of the lamp body to store rubidium metal that cannot be vaporized in the lamp body, and emitting rubidium light toward a gas cell A lamp, an excitation coil that supplies a high-frequency electromagnetic field to the rubidium lamp, a capacitive element that is connected in series to the excitation coil to form a resonance circuit, and an oscillation unit that supplies a high-frequency signal to the resonance circuit Lamp exciter,
The rubidium lamp is disposed so that the metal reservoir portion faces downward, and the excitation coil is disposed so that an optical path of the rubidium light is formed in a direction intersecting with a straight line penetrating the metal reservoir portion in the vertical direction. A lamp exciter characterized by:   When the excitation coil is arranged so that the high-frequency electromagnetic field intersects the straight line penetrating the metal reservoir in the vertical direction, one axial end of the excitation coil is brought into contact with the side surface of the lamp body. The lamp exciter according to claim 1, wherein   The lamp exciter according to claim 2, wherein the capacitive element is connected to one axial end of the excitation coil.   The excitation coil is wound around the lamp body so that the straight line penetrating the metal reservoir portion in the vertical direction and the high-frequency electromagnetic field are parallel to each other, and the direction intersecting the straight line penetrating the metal reservoir portion in the vertical direction The lamp exciter according to claim 1, wherein a part of the excitation coil is roughly wound so that the optical path is formed.   The excitation coil is wound around the lamp body so that the straight line passing through the metal reservoir portion in the vertical direction intersects the high-frequency electromagnetic field, and the capacitive element is positioned at about 2/1 of the number of turns of the excitation coil. 2. The lamp exciter according to claim 1, wherein the lamp exciter is connected in series with each other and disposed in the vicinity of the metal reservoir.   The excitation coil is wound around the lamp main body so that the high-frequency electromagnetic field intersects the straight line penetrating in the vertical direction in the metal reservoir, and the capacitive element is disposed on the emission side of the rubidium light to the gas cell arranged in proximity. The lamp exciter according to claim 1, wherein:   The excitation coil is wound around the lamp body at a predetermined inclination angle with respect to a straight line penetrating in the metal reservoir portion in the vertical direction, and in a direction intersecting with the straight line penetrating in the metal reservoir portion in the vertical direction. The lamp exciter according to claim 1, wherein an optical path is formed. An atomic oscillator that controls an oscillation frequency by utilizing a light absorption characteristic according to a microwave frequency of incident light from a rubidium light source,
An atom comprising: the lamp exciter according to any one of claims 1 to 7, a cavity resonator that resonates in the vicinity of a resonance frequency of a rubidium atom, and a gas cell in which the rubidium atom is sealed. Oscillator.

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