CN219178727U

CN219178727U - Diamond NV color center fluorescence collection system

Info

Publication number: CN219178727U
Application number: CN202321151670.4U
Authority: CN
Inventors: 赵博文; 张少春; 范永胜; 马腾飞
Original assignee: Anhui Guosheng Quantum Technology Co ltd
Current assignee: Anhui Guosheng Quantum Technology Co ltd
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-06-13
Anticipated expiration: 2033-05-15

Abstract

The utility model provides a diamond NV color center fluorescence collection system, which is characterized in that a light-to-light converter and a beam combining mechanism are arranged, two paths of fluorescence collection light paths are arranged between the light-to-light converter and the beam combining mechanism, the light-to-light converter separates laser from fluorescence transmitted along the laser light path, part of fluorescence is guided into one path of fluorescence collection light path, the other part of fluorescence enters the other path of fluorescence collection light path, the two paths of fluorescence are filtered and then enter the beam combining mechanism to be combined, and the fluorescence after being combined is collected, so that the fluorescence collection efficiency is greatly improved, and the detection sensitivity of a probe is improved.

Description

Diamond NV color center fluorescence collection system

Technical Field

The utility model relates to the field of quantum precision measurement, in particular to a diamond NV color center fluorescence collection system.

Background

When the diamond NV color center is irradiated by 532nm laser, the NV color center absorbs enough energy to be in the ground state ³ A ₂ M of (2) _s = ±1 and m _s The =0 quantum states can transition to the excited states, respectively ³ M of E _s = ±1 and m _s The quantum state=0, and at the same time, the excited state is unstable, and the excited state is generated ³ E falls back to the ground state ³ A ₂ The phenomenon of (2) can generate 637nm fluorescence in the falling process, and the spin state of the NV color center can be read through fluorescence detection. Under the action of microwave radiation and an external magnetic field, ODMR spectrum lines can be obtained by detecting fluorescence, so that physical quantities such as magnetic fields and the like can be measured.

The intensity of the fluorescence signal determines the intensity of the sensor signal, and the collection efficiency of fluorescence is lower due to the high refractive index of the diamond and the directionality of emitted fluorescence. In the existing mode for collecting fluorescence, an original laser light path is adopted to collect part of fluorescence returned along the laser light path, the laser light path transmits laser to the diamond on one hand, and fluorescence generated by the diamond on the other hand is collected; another is to place a detector directly near the diamond probe so that some of the generated fluorescence is collected. The problem in the prior art is that due to the divergence of the fluorescence emitted by the diamond, only a small part of the fluorescence can be collected, and the high-efficiency fluorescence collection effect cannot be obtained.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a diamond NV color center fluorescence collection system for solving the problem of low fluorescence collection efficiency in the prior art.

To achieve the above and other related objects, the present utility model provides a diamond NV color center fluorescence collection system, comprising: diamond containing NV color center, laser source, light-to-light converter, first filter, second filter, beam combining mechanism, and fluorescence detector; the laser source emits laser to the light converter, the laser enters the first light path after passing through the light converter and irradiates the diamond, first part of fluorescence generated by the diamond returns to the light converter along the first light path and enters the second light path after passing through the light converter, the second part of fluorescence generated by the diamond is transmitted to the second filter sheet along the second light path to be filtered and then transmitted to the beam combining mechanism, the second part of fluorescence generated by the diamond is transmitted to the first filter sheet along the first light path to be filtered and then transmitted to the beam combining mechanism, and the fluorescence transmitted by the two light paths is received by the fluorescence detector after being combined by the beam combining mechanism.

Further, the light is a dichroic mirror, the laser is reflected to the first light path after passing through the dichroic mirror, and the returned first part of fluorescence is transmitted to the second light path after passing through the dichroic mirror.

Further, the light-to-light converter is an optical circulator, the laser enters from a first port of the optical circulator and is output into a first optical path from a second port, and the returned first part of fluorescence enters from the second port of the optical circulator and is output into the second optical path from a third port.

Further, the beam combining mechanism is an optical fiber beam combiner, the optical fiber beam combiner comprises two incident optical fibers and an emergent optical fiber, the two incident optical fibers are connected to the first optical path and the second optical path in one-to-one correspondence, the two incident optical fibers are combined into the emergent optical fiber, and the emergent optical fiber transmits fluorescence to the fluorescence detector.

Further, the beam combining mechanism is a prism, one path of fluorescence is incident from a first side surface of the prism and is refracted out by a third side surface after being totally reflected on a second side surface, the other path of fluorescence is refracted out by the third side surface after being incident from the second side surface of the prism, and the fluorescence detector collects the fluorescence refracted out by the third side surface.

Further, the triangular prism is a right-angle triangular prism.

Furthermore, the first light path and the second light path are respectively provided with a collimating lens, and the filtered fluorescence in the first light path and the second light path respectively enter the triple prism after passing through the collimating lenses.

Further, the first optical path and the second optical path are both connected by an optical fiber.

Further, the diamond is connected with the end face of the optical fiber in a gluing mode.

As described above, the diamond NV color center fluorescence collection system has the following beneficial effects: by arranging the light-to-light converter and the beam combining mechanism and arranging two paths of fluorescence collecting light paths between the light-to-light converter and the beam combining mechanism, the light-to-light converter separates laser from fluorescence transmitted along the laser light paths, and guides part of fluorescence into one path of fluorescence collecting light path, and the other part of fluorescence generated by the diamond probe is collected by the other path of fluorescence collecting light path, and then the two paths of fluorescence are combined and collected, so that the fluorescence collecting efficiency is greatly improved, and the detection sensitivity of the probe is improved.

Drawings

FIG. 1 is a schematic diagram of a system according to a first embodiment of the present utility model;

FIG. 2 is a schematic diagram of a system according to a second embodiment of the present utility model;

fig. 3 shows a schematic view of the fluorescence beam combination of the triangular prism of the present utility model.

Description of element numbers: 1-diamond; 2-a laser source; 3-a light-to-light converter; 4-a first filter; 5-a second filter; 6-a beam combining mechanism; 7-a fluorescence detector; 8-a collimating lens.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the disclosure of the present utility model, and are not intended to limit the scope of the utility model, which is defined by the claims, but rather by the claims, so that any structural modifications, proportional changes, or dimensional adjustments should be made without affecting the efficacy or achievement of the present utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Embodiment one: as shown in FIG. 1, the utility model provides a diamond NV color center fluorescence collection system, which comprises a diamond 1 containing an NV color center, a laser source 2, a light-to-light converter 3, a first filter 4, a second filter 5, a beam combining mechanism 6 and a fluorescence detector 7; two paths of light paths are formed between the light-to-light converter 3 and the beam combining mechanism 6, the diamond 1 and the first filter 4 are located in the first light path, the second filter 5 is located in the second light path, the laser source 2 emits laser to the light-to-light converter 3, the laser enters the first light path after passing through the light-to-light converter 3 and irradiates the diamond 1, first part of fluorescence generated by the diamond 1 returns to the light-to-light converter 3 along the first light path and enters the second light path after passing through the light-to-light converter 3, the second part of fluorescence generated by the diamond 1 is transmitted to the second filter 5 for filtering and then is transmitted to the beam combining mechanism 6 after being transmitted to the first filter 4 for filtering along the first light path, the fluorescence transmitted by the two paths is received by the fluorescence detector 7 after being combined by the beam combining mechanism 6, and the fluorescence detector 7 adopts a photoelectric detector.

The light in this embodiment is directed to the converter 3 as a dichroic mirror, and the laser light is reflected into the first optical path after passing through the dichroic mirror, and the returned first part of the fluorescence is transmitted into the second optical path after passing through the dichroic mirror. The beam combining mechanism 6 is an optical fiber beam combiner, the optical fiber beam combiner 6 comprises two incident optical fibers and an emergent optical fiber, the two incident optical fibers are connected to the first optical path and the second optical path in a one-to-one correspondence mode, the two incident optical fibers are combined into the emergent optical fiber, the emergent optical fiber transmits fluorescence to the fluorescence detector 7, and the first optical path and the second optical path are connected through the optical fibers. The diamond is connected with the end face of the optical fiber in a gluing mode, and the first filter 4 and the second filter 5 are connected with the joints of the optical fiber.

Embodiment two: as shown in fig. 2, the difference from the first embodiment is that the light converter 3 is a light circulator and the beam combining mechanism 6 is a triangular prism. The laser enters from the first port of the optical circulator and is output to the first optical path from the second port, and the returned first part of fluorescence enters from the second port of the optical circulator and is output to the second optical path from the third port, so that the laser and the first part of fluorescence are diverted and separated through the optical circulator.

The principle of fluorescence beam combination by adopting a triple prism is shown in fig. 3, one path of fluorescence is incident from a first side surface of the triple prism and is refracted out from a third side surface after total reflection occurs on a second side surface, the other path of fluorescence is refracted out from the third side surface after incidence from the second side surface of the triple prism, and the fluorescence detector 7 collects the fluorescence refracted out from the third side surface. The triangular prism is preferably a right-angle triangular prism, and as shown in fig. 3, the fluorescence detector 7 is placed on a right-angle side face thereof for collecting fluorescence.

As shown in fig. 2, the first optical path and the second optical path are respectively provided with a collimating lens 8, and the fluorescent light is filtered by the filter and collimated by the collimating lens 8, so that the scattered fluorescent light is collimated into parallel light to be incident into the triple prism for beam combination. Because the optical paths are connected by adopting optical fibers, one end face of the collimating lens 8 is respectively connected with the optical fiber end faces of the two fluorescent light collecting optical paths, and the other end face faces the incident face of the triangular prism.

In one embodiment, the light converter 3 may be a dichroic mirror, and the beam combining mechanism 6 may be a triangular prism.

In one embodiment, the light converter 3 may be an optical circulator, and the beam combining mechanism 6 may be an optical fiber beam combiner. And will not be described in detail here.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A diamond NV colour centre fluorescence collection system, the collection system comprising: the diamond with the NV color center comprises a diamond (1), a laser source (2), a light-to-light converter (3), a first filter (4), a second filter (5), a beam combining mechanism (6) and a fluorescence detector (7); the laser beam combining device comprises a laser source (2), a light beam combining mechanism (6), a light beam converter (3), a diamond (1), a first filter (4) and a second filter (5), wherein two paths of light paths are formed between the light beam converter (3) and the light beam combining mechanism (6), the diamond (1) and the first filter (4) are located in the first light path, the laser source (2) emits laser to the light beam converter (3), the laser enters the first light path after passing through the light beam converter (3), irradiates onto the diamond (1), first part of fluorescence generated by the diamond (1) returns to the light beam converter (3) along the first light path, enters the second light path through the light beam converter (3), is transmitted to the second filter (5) along the second light path to be filtered and then transmitted to the light beam combining mechanism (6), and the second part of fluorescence generated by the diamond (1) is transmitted to the light beam combining mechanism (6) after being combined along the first light path to be received by the fluorescence detector (7).

2. A diamond NV colour centre fluorescence collection system according to claim 1, wherein: the light-to-light converter (3) is a dichroic mirror, the laser is reflected into the first light path after passing through the dichroic mirror, and the returned first part of fluorescence is transmitted into the second light path after passing through the dichroic mirror.

3. A diamond NV colour centre fluorescence collection system according to claim 1, wherein: the light-to-light converter (3) is an optical circulator, laser enters from a first port of the optical circulator and is output into a first optical path from a second port, and returned first part of fluorescence enters from the second port of the optical circulator and is output into the second optical path from a third port.

4. A diamond NV colour centre fluorescence collection system according to claim 1, wherein: the beam combining mechanism (6) is an optical fiber beam combiner, the optical fiber beam combiner comprises two incident optical fibers and an emergent optical fiber, the two incident optical fibers are connected to the first optical path and the second optical path in one-to-one correspondence, the two incident optical fibers are combined into the emergent optical fiber, and the emergent optical fiber transmits fluorescence to the fluorescence detector (7).

5. A diamond NV colour centre fluorescence collection system according to claim 1, wherein: the beam combining mechanism (6) is a triangular prism, one path of fluorescence is incident from a first side surface of the triangular prism and is refracted out by a third side surface after being totally reflected on a second side surface, the other path of fluorescence is refracted out by the third side surface after being incident from the second side surface of the triangular prism, and the fluorescence detector (7) collects the fluorescence refracted out by the third side surface.

6. A diamond NV colour centre fluorescence collection system according to claim 5, wherein: the triangular prism is a right-angle triangular prism.

7. A diamond NV colour centre fluorescence collection system according to claim 5 or 6, wherein: and the first light path and the second light path are respectively provided with a collimating lens (8), and the filtered fluorescence in the first light path and the second light path respectively enter the triple prism after passing through the collimating lenses (8).

8. A diamond NV colour centre fluorescence collection system according to claim 1, wherein: the first optical path and the second optical path are connected by optical fibers.

9. A diamond NV colour centre fluorescence collection system according to claim 8, wherein: the diamond is connected with the end face of the optical fiber in a gluing mode.