Light splitting system based on NV color center laser cancellation

Abstract

The invention discloses a light splitting system based on NV color center laser cancellation, which is used for carrying out light splitting processing on a laser beam formed by a laser light source, and belongs to the technical field of NV magnetic sensors. In the beam splitting system, a mobile reflection structure reflects part of a laser beam to form a reflected first light beam and an unreflected second light beam; the second light beam is focused on the NV color center and generates fluorescent light; the first photoelectric detector detects a photoelectric signal of the first light beam; the second photoelectric detector detects a photoelectric signal of fluorescence; and the detection module receives the photoelectric signals of the first light beam and the fluorescence, compares the photoelectric signals, and stops moving the reflection structure when the intensity difference amplitude of the photoelectric signals of the first light beam and the fluorescence is within a first preset value. The device can greatly improve the splitting ratio level, is good in laser cancellation effect, is simple and compact in structure, is small in size, and is suitable for a small NV magnetic sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of NV magnetic sensor, and particularly relates to a light splitting system based on NV color center laser cancellation. BACKGROUND

[0002] NV color center is a quantum structure in diamond, and the outermost 6 electrons of which can form a magnetic resonance structure with a spin of 1, and high-precision magnetic field measurement can be achieved by means of magnetic resonance technology. First, NV color center can emit red fluorescence (wavelength range 640-800 nm) under the irradiation of green laser (typical wavelength 532 nm or 520 nm), and the emitted red fluorescence can be detected by a photodetector. Second, NV color center can have a magnetic resonance behavior with microwaves, and when the microwave frequency and the magnetic field strength satisfy a certain relationship, the magnetic resonance phenomenon can be triggered, resulting in a decrease in the intensity of the red fluorescence emitted by the NV color center. Therefore, as long as a green laser with stable power is used to irradiate the diamond, and different frequency microwaves are used to excite the NV color center in the diamond, and a photodetector is used to synchronously detect the intensity of the fluorescence signal, when the intensity of the fluorescence signal decreases, it can be determined that the current microwave frequency is equal to the resonance frequency, and thus the magnetic field strength can be calculated by the microwave frequency.

[0003] Laser cancellation is an important application technology in NV color center magnetic sensor, which can eliminate the influence of laser source power fluctuation on NV color center magnetic measurement, and improve the magnetic measurement sensitivity of NV color center magnetic sensor. Laser cancellation is generally achieved by splitting the laser driving NV color center, and adjusting the splitting ratio. For example, a typical laser light splitting path is as follows Figure 7 The laser passes through a non-polarizing beam splitter prism, and a proportion of the laser is split from the side; then the laser passes through a neutral density filter to reach a photodetector, and the attenuation ratio of the neutral density filter is adjusted in the process. The neutral density filter here can be made into a structure with continuously adjustable attenuation ratio, or a structure with fixed attenuation ratio, and the latter can adjust the attenuation ratio by replacing the lens. However, the scheme mainly has the following shortcomings: first, the splitting ratio of the non-polarizing beam splitter prism is at most 10:1, and the splitting ratio is too large, resulting in a decrease in the intensity of the laser on the diamond, and the laser power needs to be increased to make the NV color center regain sufficient driving power, and the strong laser split also needs to be attenuated by the neutral density filter, resulting in an increase in the number of components. Second, the number of components in the light path is large, and the overall size is large, and the neutral density filter also needs a rotating adjustment structure to change the splitting ratio, which is not conducive to the miniaturization design of the sensor.

[0004] For another example, some schemes use the polarization property of laser, and use a polarizing beam splitter to split the laser (such as Figure 8The laser first passes through a 1 / 4 wave plate, and at this time, the rotating lens (1 / 4 wave plate) can change the polarization direction of the laser; according to the different polarization directions of the laser, the polarization beam splitter prism will obtain different splitting ratios, and the split laser will be irradiated on the photodetector. By rotating the 1 / 4 wave plate, the splitting ratio can be continuously and accurately adjusted, the complexity of the laser cancellation debugging is reduced, and the related test process is optimized. However, the 1 / 4 wave plate of this structure still needs a rotating structure, and the problems of large volume, many components and complex structure have not been fundamentally solved.

[0005] In addition, there are also some NV magnetic sensor schemes that do not adjust the splitting ratio, but respectively amplify the photoelectric signals collected by the two photodetectors, and realize the best cancellation effect by adjusting the amplification multiple. The optical path structure and circuit structure of the scheme are as follows Figure 9 As shown in the figure, the laser is split into two beams after passing through the lens with a fixed splitting ratio, and is collected by the photodetector; the output signal of the photodetector is amplified by the circuit and then output to the back end for subtraction, realizing the function of noise reduction. This scheme does not depend on the optical path design and is suitable for use in small sensors, but adjusting the circuit gain will change the frequency response of the laser signal and the fluorescent signal, resulting in different actual bandwidths of the two signals; moreover, the signals under different amplification multiples have different signal-to-noise ratios, which will cause the laser cancellation effect to be poor and affect the overall performance. SUMMARY

[0006] The present application aims to at least solve one of the technical problems in the related art. To this end, one object of the present application is to provide a splitting system based on NV color center laser cancellation, which can greatly improve the splitting ratio level, has good laser cancellation effect, simple and compact structure, small volume, and is suitable for small NV magnetic sensors.

[0007] The splitting system based on NV color center laser cancellation according to the embodiment of the present application is used for splitting processing of a laser beam formed by a laser light source, and includes a reflecting structure, a first photodetector, a second photodetector and a detection module.

[0008] The reflecting structure is moved to reflect part of the laser beam, forming a reflected first light beam and an unreflected second light beam;

[0009] The second light beam is focused on the NV color center and generates fluorescence;

[0010] The first photodetector detects the photoelectric signal of the first light beam;

[0011] The second photodetector detects the photoelectric signal of the fluorescence;

[0012] The detection module receives photoelectric signals of both the first light beam and the fluorescence, and compares the photoelectric signals, and when the intensity difference between the photoelectric signals of the first light beam and the fluorescence is within a first preset value, the movement of the reflecting structure is stopped.

[0013] The spectrometer system based on NV color center laser cancellation has the following advantages: first, the number of components is small and the reflecting structure has a small volume, which can be arranged compactly and occupies a small space, and is suitable for miniaturized NV magnetic sensors; second, through the design of the reflecting structure, the actual splitting ratio of the optical path can be continuously and accurately adjusted, and a splitting ratio much lower than 10:1 can be achieved, and the splitting ratio level is greatly improved; third, through the reflecting structure, the first photoelectric detector, the second photoelectric detector and the detection module, the actual splitting ratio of the optical path can be adjusted to the best splitting ratio required for laser cancellation, so that the laser cancellation effect is close to the best or the best; fourth, it is suitable for laser beams with different cross-sectional shapes.

[0014] In some embodiments, the first preset value is 10%. The preset value can be adjusted according to different use environments and requirements, including but not limited to other numerical values.

[0015] In some embodiments, the photoelectric signals of both the first light beam and the fluorescence are current signals or voltage signals.

[0016] In some embodiments, when the photoelectric signals of both the first light beam and the fluorescence are the same, the movement of the reflecting structure is stopped.

[0017] In some embodiments, the reflecting structure includes a reflecting slope, and the reflecting slope is used to reflect the laser beam.

[0018] In some embodiments, the reflecting slope is a total reflecting slope.

[0019] In some embodiments, the reflecting slope is arranged at an angle of 45 degrees relative to the laser beam.

[0020] In some embodiments, the reflecting structure further includes a transmission assembly, the reflecting slope is arranged on the transmission assembly, and the reflecting slope is moved through the transmission assembly.

[0021] In some embodiments, the transmission assembly includes a rack and a gear, the reflecting slope is arranged at one end of the rack, the gear is engaged with the rack, the gear is rotated under the drive of a power source, and the rack is moved.

[0022] In some embodiments, the application further includes a control module for controlling the movement of the reflecting structure, and the control module is connected with the detection module.

[0023] When the detection module detects that the difference between the photoelectric signal intensity of the first light beam and the photoelectric signal intensity of the fluorescence is greater than a first preset value, the signal is transmitted to the control module, and the control module adjusts and controls the movement of the reflection structure in real time until the detection module detects that the difference between the photoelectric signal intensity of the first light beam and the photoelectric signal intensity of the fluorescence is less than the first preset value.

[0024] Additional aspects and advantages of the application will be described in the following description, become apparent from the following description, or be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a module schematic diagram of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application;

[0026] Figure 2 is a schematic diagram of a reflection structure of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application in a state of not entering a laser beam;

[0027] Figure 3 is a schematic diagram of a reflection structure of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application in a state of entering a laser beam;

[0028] Figure 4 is a schematic diagram of a partial structure of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application;

[0029] Figure 5 is a schematic diagram of a partial structure of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application; Figure 4 is a schematic diagram of a partial structure of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application;

[0030] Figure 6 is another module schematic diagram of a spectrometer system based on NV color center laser cancellation according to an embodiment of the application

[0031] Figure 7 is a schematic diagram of a typical laser spectrometer optical path in the prior art;

[0032] Figure 8 is a schematic diagram of a spectrometer using a polarization spectrometer prism in the prior art;

[0033] Figure 9 is a schematic diagram of a laser cancellation without adjusting the spectrometer ratio in the prior art.

[0034] REFERENCE NUMERALS

[0035] Spectroscopic system 1000; Reflective structure 1; Reflective slope 101; Inclined corner 1011; Transmission assembly 102; Racks 1021; Gears 1022; Slots 10221; First photodetector 2; Second photodetector 3; Detection module 4; Laser light source 5; Diamond 6. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0037] The embodiments of the present application based on NV color center laser cancellation spectroscopic system 1000 are described below in conjunction with Figures 1 to 5 .

[0038] As Figures 1 to 5 shown, the embodiments of the present application based on NV color center laser cancellation spectroscopic system 1000 are used for spectroscopic processing of laser beams formed by laser light source 5, wherein laser light source 5 can adopt laser diode light source (refer to Figure 4 and Figure 5 ) or other forms of laser light source 5, and the cross-sectional shape of the laser beams formed by different forms of laser light source 5 can be different, for example, the shape of the laser beam can be circular, or non-circular such as elliptical and other different shapes; in addition, the laser beam needs to be focused when in use, and the shape of the focused spot also has uncertainty. Therefore, the shape of the laser beam and the focused spot have some uncertain factors in practice.

[0039] As Figures 1 to 5 shown, the embodiments of the present application based on NV color center laser cancellation spectroscopic system 1000, including reflective structure 1, first photodetector 2, second photodetector 3 and detection module 4, that is, the spectroscopic system 1000 is mainly composed of four parts of reflective structure 1, first photodetector 2, second photodetector 3 and detection module 4, compared with the prior art, the number of components is less, the structure arrangement is compact (refer to Figures 2 to 5 ), small in size, and can be applied to small NV magnetic sensors.

[0040] Specifically, the reflective structure 1 is movable, and the reflective structure 1 reflects part of the laser beam to form a reflected first light beam and an unreflected second light beam.

[0041] Here the reflecting structure 1 can be understood as a full reflecting structure 1, and the energy of the first light beam formed after reflection has no loss relative to the energy of the part of the laser beam incident to the reflecting structure 1. In the process of movement of the reflecting structure 1, the proportion of the first light beam and the second light beam will change, that is, the proportion of the second light beam and the first light beam can be continuously and accurately adjusted. For example, as shown in Figure 2 , the reflecting structure 1 is initially located outside the laser beam emitted by the laser light source 5, and as the reflecting structure 1 moves towards the laser beam (which can be understood as the reflecting structure 1 moving to the left), Figure 2 , the reflecting structure 1 gradually enters the laser beam (as shown in Figure 3 ), the laser area incident to the reflecting structure 1 in the laser beam gradually increases from zero, that is, the laser incident to the reflecting structure 1 gradually increases, and thus the first light beam formed after reflection by the reflecting structure 1 gradually increases, while the second light beam not reflected in the laser beam gradually decreases, so that the proportion of the second light beam and the first light beam gradually decreases, that is, the proportion of the second light beam and the first light beam can be continuously and accurately adjusted. By moving the reflecting structure 1 into the laser beam a little, a little first light beam can be separated from the laser beam, so that the ratio of the first light beam and the second light beam is much lower than 10:1. Through the design of the reflecting structure 1, on the one hand, compared with the existing light splitting technology, a light splitting ratio much lower than 10:1 can be achieved, and the actual light splitting ratio of the optical path can be adjusted to the best light splitting ratio required for laser cancellation, on the other hand, the optical lens in the prior art for adjusting the light splitting ratio is replaced, which is not limited by the process of optical elements and the volume of optical lenses. The reflecting structure 1 has a very small volume and can be installed in a very small NV magnetic sensor probe, realizing a highly miniaturized sensor structure design and effectively reducing the volume of the sensor.

[0042] The second light beam is focused on the NV color center and generates fluorescence. Specifically, the second light beam can be focused on the NV color center in the diamond 6 through a focusing lens with a small volume, that is, the energy of the second light beam is concentrated on the NV color center, so that the NV color center emits fluorescence.

[0043] The first photodetector 2 detects the photoelectric signal of the first light beam. The photoelectric signal of the first light beam can represent the intensity of the first light beam, and when the light splitting ratio of the second light beam and the first light beam is changed by adjusting the movement of the reflecting structure 1, the photoelectric signal of the first light beam will change accordingly.

[0044] The second photodetector 3 detects the photoelectric signal of the fluorescence. The photoelectric signal of the fluorescence can represent the intensity of the fluorescence, and when the light splitting ratio of the second light beam and the first light beam is changed by adjusting the movement of the reflecting structure 1, the photoelectric signal of the fluorescence will change accordingly.

[0045] The detection module 4 receives the photoelectric signals of the first light beam and the fluorescence, and compares the photoelectric signals, and stops moving the reflecting structure 1 when the intensity difference between the photoelectric signals of the first light beam and the fluorescence is within a first preset value. It can be understood that the laser cancellation effect is best when the intensity of the split laser is substantially equal to the intensity of the fluorescence emitted by the NV color center. Therefore, when the intensity difference between the photoelectric signals of the first light beam and the fluorescence is within the first preset value, it means that the intensity of the first light beam is close to or the same as the intensity of the fluorescence, and the laser cancellation effect is close to or the best, at this time, the movement of the reflecting structure 1 is stopped, and the splitting ratio of the second light beam to the first light beam can be fixed.

[0046] The first preset value is 10%, and other preset values are not limited, which can be adjusted according to different use environments and requirements.

[0047] The principle of the light splitting system 1000 based on the NV color center laser cancellation of the embodiment of the application is that: by moving the reflecting structure 1, the reflected part of the laser beam is adjusted to accurately adjust the splitting ratio of the second light beam to the first light beam, the first photoelectric detector 2 receives the first light beam and detects the photoelectric signal intensity of the first light beam, and the second photoelectric detector 3 receives the photoelectric signal intensity of the fluorescence generated by the NV color center excited by the second light beam, as a reference, 400mW laser irradiates on a 1mm×1mm×0.5mm diamond to generate about 2.5mW fluorescence, and the power ratio is about 0.63%, therefore, the intensity of the second light beam is deduced by the fluorescence intensity detected by the second photoelectric detector 3, and then the ratio of the intensity of the second light beam to the intensity of the first light beam detected by the first photoelectric detector can be determined, that is, the splitting ratio of the second light beam to the first light beam is determined. Since the intensity of the split laser is substantially equal to the intensity of the fluorescence emitted by the NV color center, the laser cancellation effect is best, therefore, when the intensity difference between the photoelectric signals of the first light beam and the fluorescence is within the first preset value, the laser cancellation effect is close to or the best, at this time, the best splitting ratio of the second light beam to the first light beam can be accurately determined, at this time, the movement of the reflecting structure 1 is stopped, and the best splitting ratio is fixed.

[0048] The spectrometer system 1000 based on NV color center laser cancellation in the embodiment of the application is designed through the reflection structure 1, and in an actual application environment, it is required that the proportion of the first light beam relative to the laser beam is smaller, which can avoid damaging the first photodetector 2, and meanwhile, other optical devices do not need to be added in front of the first photodetector 2, which is conducive to miniaturization of the NV magnetic sensor. In the prior art, the laser separated from the laser beam directly enters the photodetector, which can cause damage to the photodetector. In order to avoid damage to the photodetector, an optical device for attenuating the separated laser is usually added, so that the overall size of the existing spectrometer system is large, the space occupied is large, and it is not convenient for miniaturization of the NV magnetic sensor. According to the basis that 400 mW laser irradiation on a 1 mm*1 mm*0.5 mm diamond generates about 2.5 mW fluorescence, the fluorescence generated by the second light beam irradiation on the NV color center greatly weakens the energy of the fluorescence relative to the energy of the second light beam. Therefore, it is required that the proportion of the second light beam relative to the laser beam is larger, so that brighter fluorescence can be generated, which is convenient for the second detector to detect without damaging the second detector. The spectrometer system 1000 based on NV color center laser cancellation in the embodiment of the application can realize a spectrometer ratio of less than 10:1. In the prior art, the spectrometer ratio can only be 10:1 at most. A too large spectrometer ratio leads to a decrease in the laser intensity on the diamond, weak fluorescence is generated, and it is not convenient for the photodetector to detect. The laser power needs to be improved to obtain brighter fluorescence.

[0049] In summary, the spectrometer system 1000 based on NV color center laser cancellation in the embodiment of the application has the following advantages: first, the number of components is small, the reflection structure 1 is small in size, can be arranged compactly, occupies small space, and is suitable for miniaturized NV magnetic sensors; second, through the design of the reflection structure 1, the actual spectrometer ratio of the optical path can be continuously and accurately adjusted, and a spectrometer ratio of less than 10:1 can be realized, and the spectrometer ratio level is greatly improved; third, through the reflection structure 1, the first photodetector 2, the second photodetector 3 and the detection module 4, the actual spectrometer ratio of the optical path can be adjusted to the best spectrometer ratio required by laser cancellation, so that the laser cancellation effect is close to the best or the best; fourth, it is suitable for laser beams with different shapes and sections.

[0050] In some embodiments, the photovoltaic signals of the first light beam and the fluorescence are both current signals or both voltage signals. Both the current signal and the voltage signal are related to the light intensity, and both the current signal and the voltage signal can represent the light intensity.

[0051] In some embodiments, when the photovoltaic signal intensities of the first light beam and the fluorescence are the same, at this time, the laser cancellation effect is the best, the reflection structure 1 stops moving, and the spectrometer ratio of the second light beam to the first light beam is fixed.

[0052] In some embodiments, the reflection structure 1 comprises a reflection slope 101, which is used to reflect the laser beam.

[0053] Specifically, the reflection slope 101 has a full reflection capability. When the bevel part 1011 of the reflection slope 101 does not enter the laser beam, the entire laser beam is fully irradiated on the NV color center in the diamond 6. When the bevel part 1011 of the reflection slope 101 enters the laser beam, the laser irradiated on the bevel part 1011 is reflected to form a first light beam, which reaches the first photodetector 2. The laser in the laser beam that is not reflected, i.e., a second laser beam, continues to enter the NV color center in the diamond 6. By moving the reflection structure 1, the proportion of the area of the laser beam that is reflected can be changed, so as to adjust the light splitting ratio and achieve the best effect of laser cancellation.

[0054] In some embodiments, the reflection slope 101 is a full reflection slope 101.

[0055] In the prior art, the laser beam is split by a light splitting prism. The split laser beam energy is partially absorbed by the light splitting prism itself or transmitted out from various directions, which weakens the split laser energy. Even if a processed light splitting prism, such as a chemical treatment or a film treatment, and a lens material matching the laser frequency are used, some light energy will still be absorbed. The full reflection slope 101 is inserted into the laser beam to reflect part of the laser to form a first light beam, which is transmitted to the first photodetector. The laser that is not reflected maintains the original propagation direction to form a second light beam, which drives the NV color center diamond to generate a fluorescence signal, and the fluorescence signal is collected by the second photodetector 3. According to the laser cancellation process, the photodetector signal generated by the first light beam needs to be subtracted from the photodetector signal of the fluorescence, so as to eliminate the noise caused by the power fluctuation of the laser beam and achieve the effect of reducing noise and improving sensitivity.

[0056] In some embodiments, the reflection slope 101 is arranged at an angle of 45 degrees relative to the laser beam. In this way, the light splitting system 1000 structure is more compact.

[0057] In some embodiments, as shown in FIGS. 1A and 1B, the reflection structure 1 further comprises a transmission assembly 102, and the reflection slope 101 is arranged on the transmission assembly 102 and moves through the transmission assembly 102. Figure 4 Figure 5 In some embodiments, as shown in FIGS. 1A and 1B, the reflection structure 1 further comprises a transmission assembly 102, and the reflection slope 101 is arranged on the transmission assembly 102 and moves through the transmission assembly 102.

[0058] ​In some embodiments, the transmission assembly 102 comprises a rack 1021 and a gear 1022, the rack 1021 and the gear 1022 are fine adjustment structures, the reflection slope 101 is arranged at one end of the rack 1021, the gear 1022 is engaged with the rack 1021, and the gear 1022 is driven to rotate, thereby driving the rack 1021 and the reflection slope 101 to move. The reflection structure 1 replaces the optical lens in the prior art to adjust the light splitting ratio, is not limited by the process of the optical element, is not limited by the volume of the optical lens, the volume of the reflection structure 1 is extremely small, can be installed in a NV magnetic sensor probe with extremely small size, realizes a highly miniaturized sensor structure design, and effectively reduces the volume of the sensor.

[0059] It should be noted that the transmission assembly 102 can also adopt other mechanical adjustment structures, such as worm gear engagement, multi-link structure, conveyor belt structure, chain structure, etc.

[0060] In some embodiments, the end surface of the gear 1022 is provided with a slot 10221 matched with a tool. By inserting the tool into the slot 10221, the tool is manually rotated to drive the gear 1022 to rotate, thereby driving the rack 1021 and the reflection slope 101 at one end of the rack 1021 to move, so as to adjust the light splitting ratio.

[0061] The shape of the slot 10221 can be cross-shaped, polygonal or other shapes.

[0062] In some embodiments, the gear 1022 is driven by a motor, thereby driving the rack 1021 and the reflection slope 101 at one end of the rack 1021 to move, so as to adjust the light splitting ratio.

[0063] In actual operation, when the laser is subjected to light splitting processing, not only is it necessary to ensure that the first light beam split out and the second light beam reaching the NV color center diamond reach a certain applicable state, but also it is necessary to ensure that the first light beam is as small as possible for subsequent noise reduction processing, and the second light beam is as large as possible for focusing on the NV color center diamond to improve the fluorescence efficiency.

[0064] According to the laser cancellation process, the photoelectric signal generated by the first light beam needs to be subtracted from the photoelectric signal of the second light beam, so as to eliminate the noise caused by the fluctuation of the laser beam power, and to realize the effect of reducing noise and improving sensitivity.

[0065] However, in actual operation, the first light beam split out cannot be small enough due to the limitation of hardware, such as a light splitting prism, and is easy to be damaged when a detector detects, so the first light beam is generally subjected to weakening processing. However, adding a weakening processing device in the optical path will greatly increase the occupied space and the volume of the product.

[0066] In addition, the weakening is equivalent to wasting the energy of this part of light, thereby causing the energy of the second light beam reaching the NV color center diamond to be weakened, thereby reducing the efficiency of generating fluorescence, and thereby reducing the quality of the overall product.

[0067] The technical scheme adopted by the present application can obtain a first light beam small enough for our needs without the need to increase any device for weakening the light beam, can greatly reduce the occupied space and volume of the product, can significantly make the product smaller in volume, and is suitable for more application scenarios. In addition, the second light beam can be stronger than the prior art, without light loss, can improve the efficiency of generating fluorescence and the brightness of the fluorescence, and enhances the performance and quality of the product.

[0068] In addition, in actual use of the present application, it is found that the damage rate of the detector for detecting the first light beam is much higher than that of the detector for detecting the second light beam during long-term use, and no abnormalities are found after research and development detection;

[0069] In addition, during long-term use, it is also found that the data measured by the product is not accurate during later use, and after shutdown for inspection, no defects are found, including normal split ratio, and all performances and data are normal.

[0070] The above problems have plagued the researchers for a long time, and on the basis of the above research, the researchers have further invested research efforts and found the following problems:

[0071] In actual operation, due to real-time control of the laser, the laser may be offset, the laser beam spot may change, long-term equipment operation may cause the laser beam to change, or environmental changes such as temperature and equipment aging may affect the laser beam, thereby causing changes in the first light beam and the second light beam split out, which may damage the detector and cause inaccurate measurement results, and the product may not meet the use requirements.

[0072] Please refer to Figure 6 , Figure 6 is another module schematic diagram of the split light system based on NV color center laser cancellation of the embodiment of the present application.

[0073] Due to the above problems, the present application further provides a control module 7 for controlling the movement of the reflection structure 1, the control module 7 is connected with the detection module 4, and when the detection module 4 detects that the difference between the photoelectric signal intensities of the first light beam and the fluorescence is greater than a first preset value, the signal is transmitted to the control module 7, and the control module 7 adjusts and controls the movement of the reflection structure 1 in real time until the detection module 4 detects that the difference between the photoelectric signal intensities of the first light beam and the fluorescence is less than the first preset value.

[0074] By setting the control module 7, real-time adjustment can be performed, effectively avoiding the above-mentioned phenomenon, improving product quality and performance.

[0075] Although the embodiments of the present application have been shown and described above, it should be understood by those skilled in the art that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A spectroscopy system based on NV color center laser cancellation, for performing spectroscopy processing on a laser beam formed by a laser light source, characterized in that, The reflection structure, the first photodetector, the second photodetector and the detection module are included. The reflection structure is moved to reflect part of the laser beam, forming a reflected first light beam and a second light beam that is not reflected. The second light beam is focused on the NV color center and generates fluorescence. The first photodetector detects the photoelectric signal of the first light beam. The second photodetector detects the photoelectric signal of the fluorescence. The detection module receives the photoelectric signals of both the first light beam and the fluorescence and compares them, and when the intensity difference between the photoelectric signals of the first light beam and the fluorescence is within a first preset value, the movement of the reflection structure is stopped.

2. The NV color center laser cancellation based spectroscopy system of claim 1, wherein, The first preset value is 10%.

3. The NV color center laser cancellation based spectroscopy system of claim 1, wherein, The photoelectric signals of both the first light beam and the fluorescence are current signals or voltage signals.

4. The NV color center laser cancellation based spectroscopy system of claim 1, wherein, When the intensity of the photoelectric signals of both the first light beam and the fluorescence is the same, the reflection structure stops moving.

5. The NV color center laser cancellation based spectroscopy system of claim 1, wherein, The reflection structure includes a reflection slope for reflecting the laser beam.

6. The NV color center laser cancellation based spectroscopy system of claim 1, wherein, The reflection structure is a full reflection structure.

7. The NV color center laser cancellation based spectroscopy system of claim 6, wherein, The reflection slope is arranged at 45 degrees relative to the laser beam.

8. The NV color center laser cancellation based spectroscopy system of claim 7, wherein, The reflection structure further includes a transmission assembly, and the reflection slope is arranged on the transmission assembly and moves through the transmission assembly.

9. The NV color center laser cancellation based spectroscopy system of claim 8, wherein, The transmission assembly includes a rack and a gear, the reflection slope is arranged at one end of the rack, the gear is engaged with the rack, and the gear rotates under the drive of power and drives the rack to move.

10. The spectroscopy system based on cancellation of NV color center laser light according to any one of claims 1-9, characterized in that, A control module is further included for controlling the movement of the reflection structure, and the control module is connected with the detection module. When the detection module detects that the intensity difference between the photoelectric signals of the first light beam and the fluorescence is greater than the first preset value, it transmits a signal to the control module, and the control module adjusts and controls the movement of the reflection structure in real time until the detection module detects that the intensity difference between the photoelectric signals of the first light beam and the fluorescence is less than the first preset value.

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