JP2011137687A - Magnetic measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and highly accurate magnetic measuring apparatus. <P>SOLUTION: The magnetic measuring apparatus includes a first irradiation device provided above a first side for applying pumping light, a first reflecting member provided for the first side for making the pumping light irradiated from the first irradiation device incident onto a first cell, a second irradiation device provided above a second side for applying probe light, a second reflecting member provided for the second side for making the probe light irradiated from the second irradiation device incident onto the first cell, a third irradiation device provided above a third side for applying pumping light, a third reflecting member provided for the third side for making the pumping light irradiated from the third irradiation device incident onto a second cell, a fourth irradiation device provided above a fourth side for applying probe light, and a fourth reflecting member provided for the fourth side for making the probe light irradiated from the fourth irradiation device incident onto the second cell. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a magnetic measuring device.

Patent Documents 1-3 describe a magnetic measurement device that cancels the influence of an environmental magnetic field by overlapping a plurality of pickup coils for the purpose of measuring magnetism to be measured with high accuracy. On the other hand, Patent Document 4 describes an optical pumping type magnetic measurement device that measures the magnetism of a measurement target by irradiating a cell arranged in the vicinity of the measurement target with pumping light and probe light. . In such a magnetic measurement apparatus, it is said that the magnetism to be measured can be detected with high accuracy by arranging cells in a higher order.

Japanese Patent Laid-Open No. 11-31830 Japanese National Patent Publication No. 11-506198 JP-A-60-38670 JP 2009-14708 A

However, in an optically-pumped magnetic measuring device, generally, a plurality of components such as an irradiation device, a cell, and a detection device are arranged in a straight line in the light irradiation direction. For this reason, in an optical measurement system using an optical pumping method, when cells are arranged in a higher order, it is necessary to secure a wide area for arranging a plurality of components also in the cell arrangement direction. Can not do it. Therefore, the present invention provides a small and highly accurate magnetic measuring device by solving the above-mentioned problems.

In order to solve the above problems, a magnetic measurement apparatus according to a first aspect of the present invention is provided above a first cell in which a medium is sealed in an internal space and a first side of the first cell. , A first irradiation device that irradiates pumping light for exciting atoms of the medium toward the first side, and the first irradiation device.
And a first reflecting member that reflects the pumping light irradiated by the first irradiation device in a first direction and enters the first cell; and The first
A second irradiation device that is provided above a second side different from the second side and irradiates the probe light that is linearly polarized light toward the second side; and a second irradiation device that is provided on the second side. A second reflecting member that reflects the probe light irradiated by the second irradiation device in a second direction and enters the first cell; and an internal portion provided above the first cell. 2nd medium filled with space
A third irradiation device that is provided above the third side of the second cell and irradiates the pumping light toward the third side; and on the third side. A third reflecting member that is provided and reflects the pumping light irradiated by the third irradiation device in a third direction and enters the second cell; and the third reflecting member of the second cell. A fourth irradiation device that is provided above a fourth side different from the side and that irradiates the probe light toward the fourth side; and a fourth irradiation device that is provided on the fourth side, and And a fourth reflecting member that reflects the probe light irradiated by the irradiation device in a fourth direction and makes it incident on the second cell. According to such a configuration, it is possible to measure the magnetism of the measurement object with high accuracy by arranging the cells in a higher order, and to provide a plurality of irradiation apparatuses that irradiate light to the arranged cells. In order to arrange the plurality of irradiation devices at different positions, so as not to interfere with each other a plurality of light emitted from the plurality of irradiation devices,
A plurality of irradiation devices can be arranged in a narrow area. Therefore, the magnetic measuring device can be highly accurate and downsized.

In the above magnetic measurement apparatus, a fifth reflecting member is provided on a fifth side facing the second side of the first cell and reflects upward the probe light that has passed through the first cell. And a sixth reflecting member that is provided on a sixth side opposite to the fourth side of the second cell and reflects the probe light that has passed through the second cell upward. You may prepare. According to such a configuration, since the probe light emitted from the cell can be advanced upward in the cell arrangement direction, the detection can be performed even when a detection device or the like on which the probe light is incident is provided. The apparatus can be disposed at an upper position and at a position different from the plurality of irradiation apparatuses. Thereby, a plurality of irradiation devices and a detection device can be arranged in a narrow field, without making a plurality of lights irradiated from a plurality of irradiation devices interfere with each other. Therefore, the magnetic measuring device can be highly accurate and downsized.

In the magnetic measurement apparatus, a seventh reflection is provided on a seventh side opposite to the first side of the first cell, and reflects the pumping light having passed through the first cell upward. A member, and an eighth reflecting member that is provided on an eighth side opposite to the third side of the second cell and reflects the pumping light that has passed through the second cell upward, May be further provided. According to such a configuration, since the pumping light emitted from the cells can travel upward in the cell arrangement direction, the detection can be performed even when a detection device or the like that receives the pumping light is provided. While arrange | positioning an apparatus upwards, it can arrange | position in a different position in several irradiation apparatus. Thereby, a plurality of irradiation devices and a detection device can be arranged in a narrow field, without making a plurality of lights irradiated from a plurality of irradiation devices interfere with each other. Therefore, the magnetic measuring device can be highly accurate and downsized.

1 shows a configuration of a magnetic measurement device 100 according to an embodiment. 1 shows a configuration of a magnetic measurement device 100 according to an embodiment. The operation of the magnetic measurement apparatus 100 will be shown. The operation of the magnetic measurement apparatus 100 will be shown. The operation of the magnetic measurement apparatus 100 will be shown. The operation of the magnetic measurement apparatus 100 will be shown.

1 and 2 show a configuration of a magnetic measurement device 100 according to the embodiment. FIG. 1 shows the configuration of the magnetic measurement apparatus 100 from obliquely above. In this description, the Z direction substantially perpendicular to the magnetic detection surface in the spatial direction is indicated as “upward”. In the spatial direction, the X direction and the Y direction that are substantially parallel to the magnetic detection surface and orthogonal to the Z direction
It shows. The magnetic measuring device 100 is a measuring device using optical pumping. The magnetic measurement device 100 measures magnetism on the magnetic detection surface. For example, the magnetic measurement apparatus 100 includes a magnetoencephalograph,
It is used for a biological measurement system that measures extremely weak magnetism of several fT (femtotesla) or less, such as a magnetocardiograph.

The magnetic measurement apparatus 100 includes a cell 110 as an example of the first cell of the present invention and a cell 210 as an example of the second cell of the present invention. The cell 210 is provided above the cell 110. The cell 110 and the cell 210 have a three-dimensional shape having an internal space. In the example shown in FIG. 1, the cell 110 and the cell 210 have a cubic shape. Cell 110
In the internal space of the cell 210, cesium gas, which is one of alkali metal gases, is sealed as an example of a medium.

The magnetic measurement device 100 includes a first irradiation device 122, a first reflecting member 132, and a second irradiation device 12.
4. A second reflecting member 134 is further provided. The first irradiation device 122 is provided apart above the first side of the cell 110. The first irradiation device 122 irradiates pumping light that excites atoms of the medium enclosed in the cell 110 toward the first side of the cell 110. The first reflecting member 132 is provided on the first side, and reflects the pumping light irradiated by the first irradiation device 122 in a first direction substantially perpendicular to the incident direction of the pumping light, so that the cell 110 is incident. As the pumping light, circularly polarized light having a wavelength suitable for optical pumping of the medium sealed in the internal space of the cell 110 is used.

The second irradiation device 124 is provided above the second side of the cell 110. The second side refers to one of the sides of the cell 110 that is different from the first side. Second irradiation device 124
Irradiates the probe light which is linearly polarized light toward the second side of the cell 110. The second reflecting member 134 is provided on the second side, reflects the probe light irradiated by the second irradiation device 124 in a second direction substantially perpendicular to the incident direction of the probe light, and thereby the cell. 110 is incident. The second direction indicates a traveling direction different from the first direction. In the present embodiment, the second direction indicates a traveling direction orthogonal to the first direction.

The magnetic measurement device 100 includes a third irradiation device 222, a third reflecting member 232, and a fourth irradiation device 22.
4 and a fourth reflecting member 234 are further provided. The third irradiation device 222 is provided above the third side of the cell 210. The third side refers to one of the sides of the cell 210 that is different from the first side and the second side. The third irradiation device 222 irradiates the pumping light that excites the atoms of the medium enclosed in the cell 210 toward the third side of the cell 210. The third reflecting member 232 is provided on the third side, reflects the pumping light emitted by the third irradiation device 222 in a third direction substantially perpendicular to the incident direction of the pumping light, and 210 is incident. The third direction indicates a traveling direction different from the first direction and the second direction. As the pumping light, circularly polarized light having a wavelength suitable for optical pumping of the medium enclosed in the internal space of the cell 210 is used.

The fourth irradiation device 224 is provided above the fourth side of the cell 210. The fourth side refers to one of the sides of the cell 210 that is different from the first side, the second side, and the third side. The fourth irradiation device 224 irradiates the probe light that is linearly polarized light toward the fourth side of the cell 210. The fourth reflecting member 234 is provided on the fourth side, reflects the probe light irradiated by the fourth irradiation device 224 in a fourth direction substantially perpendicular to the incident direction of the probe light, and 210 is incident. The fourth direction is the first direction, the second direction,
And a traveling direction different from the third direction. In the present embodiment, the fourth direction is the second
Orthogonal to the direction of

The magnetic measurement device 100 further includes a fifth reflecting member 136. The fifth reflecting member 136 is
Provided on the fifth side of the cell 110, the probe light emitted from the cell 110 is reflected upward. The fifth side refers to one of the sides of the cell 110 different from the first side, the second side, the third side, and the fourth side. The fifth side is the second side across the cell 110
Opposite the side.

The magnetic measurement device 100 further includes a detection device 142. The detection device 142 is provided above the fifth side. The detection device 142 detects the magnetic intensity at the position of the cell 110 from the probe light emitted from the cell 110 and reflected by the fifth reflecting member 136. For example, the detection device 142 transmits polarized light having a specific rotation angle from the probe light by the polarizing plate. And the detection apparatus 142 detects the intensity | strength of the polarized light which permeate | transmitted the polarizing plate with a photodiode. Further, the detection device 142 calculates the polarization rotation angle of the probe light based on the detected polarization intensity and rotation angle. In addition, the detection device 142 calculates the magnetic intensity at the position of the cell 110 based on the detected polarization rotation angle. The magnetic intensity at the position of the cell 110 detected by the detection device 142 is output to an arithmetic unit that calculates the magnetic intensity on the magnetic detection surface.

The magnetic measurement device 100 further includes a sixth reflecting member 236. The sixth reflecting member 236 is
Provided on the sixth side of the cell 210, the probe light emitted from the cell 210 is reflected upward. The sixth side is one of the sides of the cell 210 that is different from the first side, the second side, the third side, the fourth side, and the fifth side. Indicates one. The sixth side faces the fourth side across the cell 210.

The magnetic measurement device 100 further includes a detection device 242. The detection device 242 is provided above the sixth side. The detection device 242 receives the probe light emitted from the cell 210 and reflected by the sixth reflecting member 236, and detects the magnetic intensity at the position of the cell 210 from the probe light. For example, the detection device 242 transmits polarized light having a specific rotation angle from the probe light by the polarizing plate. And the detection apparatus 242 detects the intensity | strength of the polarized light which permeate | transmitted the polarizing plate with a photodiode. Further, the detection device 242 calculates the polarization rotation angle of the probe light based on the detected polarization intensity and rotation angle. In addition, the detection device 242 calculates the magnetic intensity at the position of the cell 210 based on the detected polarization rotation angle. The magnetic intensity at the position of the cell 210 detected by the detection device 242 is output to an arithmetic unit that calculates the magnetic intensity on the magnetic detection surface.

The magnetic measurement device 100 further includes a seventh reflecting member 138. The seventh reflecting member 138 is
Provided on the seventh side of the cell 110, the pumping light emitted from the cell 110 is reflected upward. The seventh side is different from the first side, the second side, the third side, the fourth side, the fifth side, and the sixth side. Indicates one of the sides. The seventh side faces the first side across the cell 110.

The magnetic measurement device 100 further includes an eighth reflecting member 238. The eighth reflecting member 238 is
Provided on the eighth side of the cell 210, the pumping light emitted from the cell 210 is reflected upward. The eighth side is the first side, the second side, the third side, the fourth side, the fifth side, the sixth side, and the seventh side. 1 shows one of the sides of the cell 210 different from FIG.
The eighth side faces the third side across the cell 210.

The magnetic measurement device 100 further includes a detection device 144. The detection device 144 is provided above the seventh side. The detection device 144 receives the pumping light emitted from the cell 110 and reflected by the seventh reflecting member 138, and detects the intensity of the pumping light.
The intensity of the pumping light detected by the detection device 144 is output to a monitoring device or the like.

The magnetic measurement device 100 further includes a detection device 244. The detection device 244 is provided above the eighth side. The detection device 244 receives the pumping light emitted from the cell 210 and reflected by the eighth reflecting member 238, and detects the intensity of the pumping light.
The intensity of the pumping light detected by the detection device 244 is output to a monitoring device or the like.

FIG. 2 is a plan view of the configuration of the magnetic measurement device 100 from above. As shown in FIG. 2, the plurality of irradiation devices and the plurality of detection devices are provided at different positions in the X direction and the Y direction. In particular, in the magnetic measurement device 100, a plurality of irradiation devices and a plurality of detection devices are arranged on concentric circles centering on the cell 110 and the cell 210. Note that the plurality of irradiation devices and the plurality of detection devices are all provided at the same position in the Z direction. All of the plurality of irradiation devices irradiate light downward substantially perpendicularly to the magnetic detection surface. Moreover, light is incident on the plurality of detection devices substantially perpendicularly to the magnetic detection surface from below. For this reason, the plurality of lights traveling downward from the plurality of irradiation apparatuses and the plurality of lights traveling downward from the plurality of detection apparatuses proceed in parallel without crossing each other. Thereby, it can prevent that the some light irradiated from several irradiation apparatus and the some light which injects into a some detection apparatus interfere.

3, 4, 5, and 6 show the operation of the magnetic measurement device 100. First, the operation for detecting magnetism by the cell 110 will be described with reference to FIG. First, the 1st irradiation apparatus 122 provided above the 1st side of the cell 110 irradiates pumping light toward the downward direction. The pumping light emitted from the first irradiation device 122 is reflected in a first direction substantially perpendicular to the incident direction of the pumping light by the first reflecting member 132 provided on the first side,
The light enters the cell 110. The pumping light incident on the cell 110 passes through the internal space of the cell 110. Thereby, the atoms of the medium enclosed in the internal space of the cell 110 are excited, and the directions of the electron spins are aligned. The pumping light that passes through the internal space of the cell 110 and is emitted from the cell 110 is reflected upward by the seventh reflecting member 138 provided on the seventh side, and is provided above the seventh reflecting member 138. The light enters the detection device 144.

In this way, the second irradiation device 124 provided above the second side of the cell 110 in a state where the directions of the electron spins of the atoms of the medium enclosed in the internal space of the cell 110 are aligned,
Irradiate the probe light downward. The probe light emitted from the second irradiation device 124 is
The second reflecting member 134 provided on the second side is reflected in a second direction substantially perpendicular to the incident direction of the probe light and is incident on the cell 110. The probe light incident on the cell 110 passes through the internal space of the cell 110. The polarization plane of the probe light that has passed through the internal space of the cell 110 is rotated according to the magnetic intensity at the position of the cell 110. The probe light that passes through the internal space of the cell 110 and is emitted from the cell 110 is a fifth light provided on the fifth side.
The light is reflected upward by the reflection member 136 and is incident on the detection device 142 provided above the fifth reflection member 136.

FIG. 4 shows the traveling direction of pumping light and probe light in the cell 110. FIG. 4 is a plan view of the configuration of the magnetic measuring device 100 from above. As shown in FIG.
The pumping light emitted from the irradiation device 122 passes through the internal space of the cell 110 in the first direction. On the other hand, the probe light irradiated from the second irradiation device 124 passes through the internal space of the cell 110 in a second direction substantially orthogonal to the first direction. As described above, in the magnetic measurement device 100 of the present embodiment, the pumping light and the probe light interfere with each other by changing the traveling direction of the pumping light and the traveling direction of the probe light that pass through the internal space of the cell 110. Can be prevented.

Next, an operation for detecting magnetism by the cell 210 will be described with reference to FIG. First, the third irradiation device 222 provided above the third side of the cell 210 irradiates the pumping light downward. The pumping light emitted from the third irradiation device 222 is thirdly perpendicular to the incident direction of the pumping light by the third reflecting member 232 provided on the third side.
And is incident on the cell 210. The pumping light incident on the cell 210 is
It passes through the internal space of the cell 210. As a result, the atoms of the medium enclosed in the internal space of the cell 210 are excited, and the directions of the electron spins are aligned. The pumping light that passes through the internal space of the cell 210 and is emitted from the cell 210 is the eighth reflecting member 23 provided on the eighth side.
8 is reflected upward and is incident on a detection device 244 provided above the eighth reflecting member 238.

As described above, the fourth irradiation device 224 provided above the fourth side of the cell 210 in a state in which the electron spin directions of the atoms of the medium enclosed in the internal space of the cell 210 are aligned,
Irradiate the probe light downward. The probe light emitted from the fourth irradiation device 224 is
The fourth reflecting member 234 provided on the fourth side is reflected in a fourth direction substantially perpendicular to the incident direction of the probe light and is incident on the cell 210. The probe light incident on the cell 210 passes through the internal space of the cell 210. The polarization plane of the probe light that has passed through the internal space of the cell 210 is rotated according to the magnetic intensity at the position of the cell 210. The probe light that passes through the internal space of the cell 210 and is emitted from the cell 210 is a sixth light provided on the sixth side.
The light is reflected upward by the reflecting member 236 and is incident on the detection device 242 provided above the sixth reflecting member 236.

FIG. 6 shows the traveling direction of pumping light and probe light in the cell 210. FIG. 6 is a plan view of the configuration of the magnetic measuring device 100 from the Z direction. As shown in FIG. 6, the pumping light emitted from the third irradiation device 222 passes through the internal space of the cell 210 in the third direction. On the other hand, the probe light irradiated from the fourth irradiation device 224 passes through the internal space of the cell 210 in a fourth direction substantially orthogonal to the third direction. As described above, the magnetic measurement device 100 according to the present embodiment makes the pumping light and the probe light pass through the internal space of the cell 210 by changing the traveling direction of the pumping light and the traveling direction of the probe light. Interference can be prevented.

According to the magnetic measurement apparatus 100 of the present embodiment, it is possible to measure the magnetism of a measurement object with high accuracy by arranging cells in a higher order and increasing the order, and a plurality of irradiation apparatuses for a plurality of cells are arranged upward. Since it arrange | positions and these several irradiation apparatuses are arrange | positioned in a different position, a some irradiation apparatus can be arrange | positioned in a narrow area | region, without making the several light irradiated from the several irradiation apparatus mutually interfere. Therefore, the magnetic measuring device can be highly accurate and downsized.

Furthermore, since the plurality of detection devices that reflect the probe light emitted from the cell and are incident on the probe light are arranged on the upper side and at positions different from the plurality of irradiation devices, the plurality of irradiation devices The plurality of irradiation devices and the plurality of detection devices can be arranged in a narrow region without causing the plurality of lights irradiated from the above to interfere with each other. Therefore, the magnetic measuring device can be highly accurate and downsized.

Furthermore, since the plurality of detection devices that reflect the pumping light emitted from the cell upward and are incident on the pumping light are arranged at the top and at positions different from the plurality of irradiation devices, the plurality of irradiation devices The plurality of irradiation devices and the plurality of detection devices can be arranged in a narrow region without causing the plurality of lights irradiated from the above to interfere with each other. Therefore, the magnetic measuring device can be highly accurate and downsized.

The magnetic measuring device 100 of this embodiment is not limited to the structure demonstrated so far. For example, as shown in FIG. 2, the magnetic measurement device 100 of the present embodiment has a configuration in which a plurality of irradiation devices and a plurality of detection devices are arranged concentrically at different positions at intervals of 45 degrees. Not limited to. For example, it is good also as a structure which arrange | positions a several irradiation apparatus and a several detection apparatus by making a position differ in a space | interval narrower than 45 degree | times or a wide space | interval. Further, the plurality of irradiation devices and the plurality of detection devices may not be arranged on concentric circles. In these cases, it is not necessary to change the positions of the plurality of irradiation devices and the plurality of detection devices at regular intervals.

Moreover, although the position in the direction substantially perpendicular to the magnetic detection surface of the plurality of irradiation devices and the plurality of detection devices is the same, this is not restrictive, and the position in the direction perpendicular to the magnetic detection surface is different. Also good. Thereby, for example, a plurality of devices interfere with each other in a substantially horizontal direction with respect to the magnetic detection surface, and the plurality of devices cannot be disposed at the same position in a direction substantially perpendicular to the magnetic detection surface. Even so, by appropriately varying the position in the direction substantially perpendicular to the magnetic detection surface, the plurality of irradiation devices and the plurality of detection devices can interfere with each other in a direction substantially horizontal to the magnetic detection surface. Can be arranged.

Further, the magnetic measurement device 100 of the present embodiment is configured to vary the traveling directions of the plurality of lights passing through the cell 110 and the cell 210 at intervals of 45 degrees in a direction substantially horizontal to the magnetic detection surface. However, the present invention is not limited to this, and as long as a plurality of lights do not interfere with each other, the traveling directions of the plurality of lights may be different at intervals smaller than 45 degrees or wider. In these cases, it is not necessary to change the traveling directions of the plurality of lights at a constant interval.

In the magnetic measurement device 100, the detection device 144 may be provided without providing the seventh reflecting member 138 on the seventh side, and the detection device 144 may directly receive the pumping light emitted from the cell 110. Similarly, in the magnetic measurement device 100, the detection device 244 may be provided without providing the eighth reflecting member 238 on the eighth side, and the detection device 244 may directly receive the pumping light emitted from the cell 210. . When it is not necessary to detect the pumping light emitted from the cell 110, the magnetic measurement device 100 does not have to provide the detection device 144. In this case, instead of the detection device 144, a member that absorbs the pumping light reflected by the seventh reflecting member 138 may be provided.

Further, the above-mentioned member may be provided without providing the seventh reflecting member 138 on the seventh side, and the pumping light emitted from the cell 110 may be directly incident on the member. Similarly, when there is no need to detect the pumping light emitted from the cell 210, the magnetic measurement device 100 detects the detection device 244.
May not be provided. In this case, instead of the detection device 244, a member that absorbs the pumping light reflected by the eighth reflecting member 238 may be provided. Further, the member may be provided without providing the eighth reflecting member 238 on the eighth side, and the pumping light emitted from the cell 210 may be directly incident on the member.

Each reflecting member is configured to reflect the light incident on the reflecting member perpendicularly to the incident direction of the light, but is not limited thereto. For example, each reflecting member may reflect light incident on the reflecting member at an acute angle or an obtuse angle rather than perpendicular. The cell 110 is not limited to a cubic shape, and may have other shapes. The medium enclosed in the cell 110 and the cell 210 is not limited to cesium gas, and other alkali metal gases such as potassium gas and rubidium gas may be used. Further, the medium enclosed in the cell 110 is not limited to the alkali metal gas, and other mediums such as a rare gas may be used.

The magnetic measurement apparatus 100 may further include one or more cells that are provided above the cells 110 and 210 and have the same configuration as the cells 110 and 210. That is, it is good also as a structure which arranges three or more cells upwards, and makes it higher order. In this case, the magnetism to be measured can be measured with higher accuracy, and the magnetic measuring device 1 described so far is used.
Similarly to 00, by arranging a plurality of irradiation devices and a plurality of detection devices at different upper positions, a plurality of irradiation devices and a plurality of detection devices can be arranged within a narrow range without interfering with a plurality of lights. Can be arranged.

100 ... magnetic measuring device, 120 ... cell, 122 ... first irradiation device, 124
.. second irradiation device 132... First reflecting member 134... Second reflecting member 136.
-5th reflection member, 138 ... 7th reflection member, 142 ... detection apparatus, 144 ... detection apparatus, 210 ... cell, 222 ... 3rd irradiation apparatus, 224 ... 4th Irradiation device, 23
2 ... 3rd reflective member, 234 ... 4th reflective member, 236 ... 6th reflective member, 238
... Eighth reflecting member, 242 ... Detection device, 244 ... Detection device

Claims (3)

A first cell in which a medium is enclosed in an internal space;
A first irradiation device that is provided above a first side of the first cell and irradiates pumping light that excites atoms of the medium toward the first side;
A first reflecting member provided on the first side and configured to reflect the pumping light irradiated by the first irradiation device in a first direction and to enter the first cell;
A second irradiation device which is provided above a second side different from the first side of the first cell and irradiates the probe light which is linearly polarized light toward the second side;
The probe light provided on the second side and irradiated by the second irradiation device is
A second reflecting member that reflects in a second direction and is incident on the first cell;
A second cell provided above the first cell and having a medium sealed in an internal space;
A third irradiation device that is provided above a third side of the second cell and irradiates the pumping light toward the third side;
A third reflecting member provided on the third side and configured to reflect the pumping light irradiated by the third irradiation device in a third direction and to enter the second cell;
A fourth irradiation device that is provided above a fourth side different from the third side of the second cell and irradiates the probe light toward the fourth side;
The probe light provided on the fourth side and irradiated by the fourth irradiation device,
A fourth reflecting member that reflects in a fourth direction and enters the second cell;
A magnetic measuring device comprising: A fifth reflecting member that is provided on a fifth side facing the second side of the first cell and reflects the probe light that has passed through the first cell upward;
A sixth reflecting member provided on a sixth side opposite to the fourth side of the second cell and reflecting the probe light that has passed through the second cell upward; The magnetic measuring device according to claim 1. A seventh reflecting member provided on a seventh side opposite to the first side of the first cell and reflecting the pumping light that has passed through the first cell upward;
An eighth reflecting member that is provided on the eighth side opposite to the third side of the second cell and reflects the pumping light that has passed through the second cell upward;
The magnetic measuring device according to claim 2, further comprising:

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