Information storage device and information writing and reading method suitable for diamond

Abstract

The invention relates to the technical field of optical information storage, and discloses an information storage device suitable for diamond and an information writing and reading method.The information storage device comprises a first focusing element, a moving platform, a baffle, a second focusing element and a first photoelectric detector which are sequentially arranged; emergent light of the laser transmitter sequentially passes through the first focusing element, the moving platform and the second focusing element to reach the first photoelectric detector; the moving platform is used for placing diamonds and can move in the horizontal direction; the baffle can move in the horizontal direction to block or allow the laser to be emitted to the second focusing element and the first photoelectric detector. According to the information storage device and the information writing and reading method suitable for the diamond, fluorescent defect induction can be carried out on the diamond through the same device so as to write information, and information reading can be carried out on the diamond with the fluorescent defect.

Description

Technical Field

[0001] The present invention relates to the technical field of optical information storage, and in particular to an information storage device suitable for diamond and an information writing and reading method. Background Art

[0002] Existing information storage technologies, such as hard drives, solid-state drives, and optical disks, suffer from limited storage lifespans and inability to withstand extreme environments, such as high temperatures, high pressures, and corrosion. These factors hinder the growing demand for long-term, reliable data storage. Diamond, with its exceptional properties, including high hardness, chemical inertness, and wide temperature stability, is considered a promising ultra-durable storage medium.

[0003] Using laser-induced fluorescence defects within diamond to encode and store information is a viable approach to achieving high-density, long-life data storage, particularly suitable for data preservation under extreme conditions. However, existing solutions for diamond information storage require separate writing and reading devices, resulting in complex and costly systems and hindering device integration and ease of operation. Summary of the Invention

[0004] The purpose of the present invention is to provide an information storage device and information writing and reading method suitable for diamond, which can induce fluorescence defects in diamond to write information and read information from diamond with fluorescence defects through the same device.

[0005] In order to achieve the above-mentioned object, a first aspect of the present invention provides an information storage device suitable for diamond, comprising:

[0006] A first focusing element, a movable platform, a baffle, a second focusing element and a first photodetector are arranged in sequence;

[0007] A laser emitter, wherein the central wavelength of the laser emitted by the laser emitter is greater than 700 nm, and the output light of the laser emitter passes through the first focusing element, the movable platform, the second focusing element, and reaches the first photodetector in sequence;

[0008] The movable platform is used to place the diamond and is capable of moving in a horizontal direction;

[0009] The baffle is movable in a horizontal direction to block or allow the laser light to strike the second focusing element and the first photodetector.

[0010] Furthermore, the information storage device suitable for diamond further includes a dichroic mirror, a third focusing element and a second photodetector, wherein the incident end of the dichroic mirror faces the output port of the laser emitter, and the output end of the dichroic mirror faces the first focusing element.

[0011] The dichroic mirror is capable of reflecting light of long wavelength and passing light of short wavelength;

[0012] When the dichroic mirror receives the laser light emitted by the laser emitter, the dichroic mirror is capable of reflecting the laser light to form a first optical path that sequentially passes through the first focusing element, the moving platform, the second focusing element, and finally reaches the first photodetector;

[0013] The blue fluorescence generated by the fluorescent defects of the diamond passes through the second focusing element and the first photodetector in sequence to form a second optical path;

[0014] When the dichroic mirror receives the blue fluorescence generated by the fluorescent defects of the diamond, the blue fluorescence passes through the first focusing element, the dichroic mirror, the third focusing element, and the second photodetector in sequence to form a third optical path.

[0015] Furthermore, the information storage device suitable for diamond further includes an intensity modulator, and the intensity modulator is arranged between the laser emitter and the dichroic mirror.

[0016] Furthermore, the laser emitter is a picosecond laser emitter or a femtosecond laser emitter.

[0017] A second aspect of the present invention provides an information writing method, using the information storage device suitable for diamond, comprising the following steps:

[0018] S11, fixing the diamond on the mobile platform;

[0019] S12, moving the baffle to a position blocking the passage of the first light path;

[0020] S13, controlling the laser emitter to emit laser;

[0021] S14, using the intensity modulator to modulate the intensity of the laser according to preset stored information;

[0022] S15, adjusting the first focusing element so that the laser is focused on a predetermined writing position of the diamond to induce the formation of the fluorescent defect;

[0023] S16, moving the movable platform or adjusting the first focusing element to move the focus relative to the diamond, thereby forming a plurality of fluorescent defects on the diamond.

[0024] Furthermore, in S15 and S16, the second photodetector is used to perform real-time fluorescence monitoring on the fluorescent defect on the diamond to determine whether the fluorescent defect at the current position is successfully written.

[0025] Furthermore, after S16, a stability test is performed on the diamond having the fluorescent defect.

[0026] A third aspect of the present invention provides an information reading method, which uses the information storage device suitable for diamond to read information from the diamond having the fluorescent defect, comprising the following steps:

[0027] S21, fixing the diamond having the fluorescent defect on the mobile platform;

[0028] S22, moving the baffle to a position allowing the first light path to pass through;

[0029] S23, controlling the intensity modulator to adjust the laser intensity to an intensity that causes the defect to emit blue fluorescence but does not induce the formation of the fluorescent defect;

[0030] S24. Adjust the first focusing element so that the laser can be focused on the location of the fluorescent defect, and adjust the second focusing element and the third focusing element to direct the second light path to the first photodetector and the third light path to the second photodetector.

[0031] S25 , moving the movable platform or adjusting the first focusing element so that the focus and the diamond move relative to each other, and sequentially reading information of the plurality of fluorescent defects.

[0032] Furthermore, in S25, filters are placed at the second optical path between the second focusing element and the first photodetector and at the third optical path between the third focusing element and the second photodetector, respectively, and the first photodetector and the second photodetector are used to detect whether there is fluorescence with a central wavelength lower than 500 nm at the position of the fluorescence defect. If the central wavelength of the fluorescence detected by the first photodetector and the second photodetector is lower than 500 nm, the fluorescence defect is valid; if the central wavelength of the fluorescence detected by the first photodetector and the second photodetector is higher than 500 nm, the fluorescence defect is invalid.

[0033] Compared with the prior art, the information storage device and information writing and reading method applicable to diamond according to the embodiment of the present invention have the following beneficial effects:

[0034] The same device is used to induce fluorescence defects in diamonds to write information and read information from diamonds with fluorescence defects, eliminating the need to replace different equipment and simplifying the structure of information storage and reading.

[0035] A movable baffle is provided, which can selectively block or allow the laser to be emitted to the second focusing element and the first photodetector. When the baffle is selected to block the laser from being emitted to the second focusing element and the first photodetector, the information storage device can perform an information writing operation on the diamond. The laser emitter emits a laser, which is focused on the diamond placed on the movable platform through the first focusing element. The laser focus induces a fluorescent defect on the diamond. The baffle blocks the laser from continuing to transmit, thereby preventing the laser from damaging the first photodetector. When the baffle is selected to allow the laser to be emitted to the second focusing element and the first photodetector, the information storage device can read information from the diamond having the fluorescent defect. The laser emitter emits a laser, which is focused on the fluorescent defect of the diamond placed on the movable platform through the first focusing element. The laser continues to be emitted to the second focusing element and the first photodetector. The first photodetector acquires the fluorescence generated by the fluorescent defect of the diamond to realize information reading of the fluorescent defect.

[0036] Furthermore, the present invention uses laser to write information into diamond for storage, so that the stored information has better storage stability in a wide range of temperatures, pressures, magnetic fields, power plants and corrosive environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a schematic structural diagram of an information storage device applicable to diamond according to an embodiment of the present invention;

[0038] Figure 2 is the spectrum of blue fluorescence emitted by the fluorescent defect detected by the photodetector;

[0039] Figure 3 This is a scanning electron microscope image of a fluorescent defect produced by a pulsed laser;

[0040] Figure 4 is a schematic diagram of blue fluorescence produced by a fluorescent defect;

[0041] Figure 5 This is a cross-sectional image of a diamond with three layers of information written into it;

[0042] Figure 6 is a flow chart of an information writing method according to an embodiment of the present invention;

[0043] Figure 7 is a flow chart of an information reading method according to an embodiment of the present invention;

[0044] In the figure, 1. Laser transmitter;

[0045] 2. a first focusing element;

[0046] 3. Mobile platform;

[0047] 4. Baffle;

[0048] 5. Second focusing element;

[0049] 6. A first photodetector;

[0050] 7. Dichroic mirror;

[0051] 8. The third focusing element;

[0052] 9. A second photodetector;

[0053] 10. First optical path;

[0054] 11. Second optical path;

[0055] 12. The third optical path;

[0056] 13. Intensity modulator;

[0057] 14. Diamond. DETAILED DESCRIPTION

[0058] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0059] In the description of the present invention, the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," "lateral," and "longitudinal" to indicate directions or positions are based on the directions or positions shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and to simplify the description. They are not intended to limit the devices, elements, or components indicated to having a specific direction, or to be constructed or operated in a specific direction. Therefore, they should not be construed as limitations on the present invention. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0060] In the description of the present invention, the terms "provided with," "disposed," "connected," and "placed" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0061] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0062] The technical solution of the present invention is further described below with reference to the embodiments and drawings.

[0063] like Figure 1-7 As shown, a first aspect of an embodiment of the present invention provides an information storage device suitable for diamond, comprising:

[0064] A first focusing element 2, a movable platform 3, a baffle 4, a second focusing element 5 and a first photodetector 6 are arranged in sequence;

[0065] Laser emitter 1, the central wavelength of the laser emitted by laser emitter 1 is greater than 700nm, and the output light of laser emitter 1 passes through first focusing element 2, moving platform 3, second focusing element 5 and reaches first photodetector 6 in sequence;

[0066] The movable platform 3 is used to place the diamond 14 and can move in the horizontal direction;

[0067] The baffle 4 can move in the horizontal direction to block or allow the laser light to strike the second focusing element 5 and the first photodetector 6 .

[0068] Specifically, the central wavelength of the laser emitted by the laser transmitter 1 is selected to be 1030 nm.

[0069] Specifically, the first focusing element 2 is a convex lens group, the second focusing element 5 is a convex lens group, the third focusing element 8 is a convex lens group, and the first photodetector 6 is used to monitor the light intensity signal.

[0070] Based on the above technical solution, a movable baffle 4 is provided, which can selectively block or allow the laser to be shot to the second focusing element 5 and the first photodetector 6. When the baffle 4 chooses to block the laser from being shot to the second focusing element 5 and the first photodetector 6, the information storage device can perform an information writing operation on the diamond 14. The laser emitter 1 emits a laser, which is focused on the diamond 14 placed on the movable platform 3 through the first focusing element 2. The laser focus induces a fluorescent defect on the diamond 14. The baffle 4 blocks the laser from continuing to transmit, preventing the laser from damaging the first photodetector 6. When the baffle 4 chooses to allow the laser to be shot to the second focusing element 5 and the first photodetector 6, the information storage device can perform an information writing operation on the diamond 14. The laser emitter 1 emits a laser, which is focused on the diamond 14 placed on the movable platform 3 through the first focusing element 2. The laser focus induces a fluorescent defect on the diamond 14. The baffle 4 blocks the laser from continuing to transmit, preventing the laser from damaging the first photodetector 6. When light is emitted to the second focusing element 5 and the first photodetector 6, the information storage device can read information from the diamond 14 with a fluorescent defect. The laser emitter 1 emits a laser, which is focused on the fluorescent defect of the diamond 14 placed on the movable platform 3 through the first focusing element 2. The laser continues to be emitted to the second focusing element 5 and the first photodetector 6. The first photodetector 6 obtains the fluorescence generated by the fluorescent defect of the diamond 14 to realize the reading of information of the fluorescent defect. The same device is used to induce fluorescent defects in the diamond 14 to write information and read information from the diamond 14 with fluorescent defects.

[0071] Preferably, the information storage device suitable for diamond further includes a dichroic mirror 7, a third focusing element 8 and a second photodetector 9, wherein the incident end of the dichroic mirror 7 faces the exit port of the laser emitter 1, and the exit end of the dichroic mirror 7 faces the first focusing element 2.

[0072] When the dichroic mirror 7 receives the laser light emitted by the laser emitter 1, the dichroic mirror 7 is capable of reflecting the laser light to form a first optical path 10 that passes through the first focusing element 2, the moving platform 3, the second focusing element 5 and finally the first photodetector 6 in sequence;

[0073] The blue fluorescence generated by the fluorescence defects of the diamond 14 passes through the second focusing element 5 and the first photodetector 6 in sequence to form a second optical path 11;

[0074] When the dichroic mirror 7 receives the blue fluorescence generated by the fluorescence defect of the diamond 14 , the blue fluorescence passes through the first focusing element 2 , the dichroic mirror 7 , the third focusing element 8 , and the second photodetector 9 in sequence to form a third optical path 12 .

[0075] Specifically, the second photodetector 9 is used to detect the light intensity signal.

[0076] When reading information, two independent reading optical paths can be used: the second optical path 11 and the third optical path 12. The first photodetector 6 and the second photodetector 9 respectively read information from the second optical path 11 and the third optical path 12. The information acquisition is redundant, which improves the reliability of fluorescence defect reading and prevents reading failure caused by failure of a single photodetector. The information obtained by the first photodetector 6 and the second photodetector 9 can be compared and verified with each other. If there is a significant difference or abnormality in the information, the operator can be prompted to check the debugging status. It provides a built-in verification mechanism, which helps to identify and correct errors introduced by improper debugging, and increases the credibility of the information reading process.

[0077] More preferably, the information storage device suitable for diamond further includes an intensity modulator 13 , which is disposed between the laser emitter 1 and the dichroic mirror 7 .

[0078] The intensity modulator 13 can effectively serve two different operating states of information writing and information reading of the diamond 14 by dynamically changing the intensity or energy of the laser pulse according to demand, thereby improving the flexibility of the device and the switching efficiency of the two operating states.

[0079] Preferably, the laser emitter 1 is a picosecond laser emitter 1 or a femtosecond laser emitter 1 .

[0080] A picosecond laser emitter 1 or a femtosecond laser emitter 1 is selected as the writing light source. Ultrafast lasers (picosecond lasers and femtosecond lasers here) have extremely high peak power and achieve precise energy deposition inside the diamond 14 through nonlinear absorption. The nonlinear absorption process usually has a very steep threshold, that is, significant absorption and material modification will only occur when the laser intensity exceeds a specific threshold. Ultrafast lasers can be focused close to the diffraction limit, and the energy deposition area can be confined to an extremely small volume, thereby changing the local structure and generating fluorescent defects without significantly damaging its surface or areas outside the focus. Ultrafast lasers have extremely short pulse durations, which are very short and are shorter than the thermal diffusion time inside the material (the time it takes for energy to be transferred from electrons to the lattice and diffuse). The energy is deposited before the heat has time to diffuse over a large area, triggering material changes and forming fluorescent defects. The thermal damage around the generated fluorescent defects is very small, and the surrounding diamond 14 matrix and the data points that have been written nearby are almost not affected by the heat, ensuring the stability and reliability of storage and providing highly repeatable and deterministic defect manufacturing capabilities.

[0081] A second aspect of an embodiment of the present invention provides an information writing method using an information storage device suitable for diamond, comprising the following steps:

[0082] S11, placing the diamond 14 on the mobile platform 3;

[0083] S12, moving the baffle 4 to a position where it blocks the passage of the first light path 10;

[0084] S13, controlling the laser emitter 1 to emit a laser with a photon energy less than the diamond band gap energy value (5.4 eV);

[0085] S14, using the intensity modulator 13 to modulate the intensity of the laser according to the preset storage information;

[0086] S15, adjusting the first focusing element 2 so that the laser is focused on a predetermined writing position of the diamond 14 to induce formation of a fluorescent defect;

[0087] S16 , moving the mobile platform 3 or adjusting the first focusing element 2 to move the focus relative to the diamond 14 , thereby forming a plurality of fluorescent defects on the diamond 14 and realizing three-dimensional writing of information.

[0088] The process of generating diamond fluorescence defects is to focus the laser on the surface or inside of the diamond 14 until the second photodetector detects blue fluorescence below 500nm, then use the intensity modulator 13 to reduce the laser intensity to the light intensity required for reading, move the focus to the next position where the fluorescence defect needs to be generated, and then adjust the laser intensity back to the intensity during writing. Repeat the above operation to form multiple fluorescence defects.

[0089] Specifically, the laser emitted by the laser emitter 1 is in the near infrared band (1.0 eV <hν<1.8eV)。

[0090] More preferably, in S15 and S16, the fluorescent defects on the diamond 14 are monitored in real time by the second photodetector 9, that is, when the second photodetector 9 detects that the fluorescent defect emits blue light with a central wavelength below 500nm, it is a valid fluorescent defect, so as to determine whether the fluorescent defect at the current position is successfully written.

[0091] More preferably, after S16 , a stability test is performed on the diamond 14 having fluorescent defects.

[0092] Specifically,

[0093] 1. Exposing the diamond 14 having fluorescent defects to a temperature range of 6-800K;

[0094] 2. Expose the diamond 14 with fluorescent defects to 10 -9 -10 9 The pressure range is within Pa;

[0095] 3. Exposing the diamond 14 having fluorescent defects to a magnetic field strength range of 0-5 T;

[0096] 4. Expose the diamond 14 with fluorescent defects to 0-10 4 In the electric field strength range of V / cm;

[0097] 5. Exposing the diamond 14 with fluorescent defects to extreme corrosion conditions (immersing in aqua regia and piranha solution for more than 24 hours);

[0098] 6. Exposing the fluorescent defects of the diamond 14 to the laser used for reading the information for more than 180 minutes;

[0099] The blue fluorescence produced by the fluorescent defects in diamond has not been significantly weakened.

[0100] A third aspect of an embodiment of the present invention provides an information reading method for reading information from a diamond 14 having fluorescent defects obtained based on the information writing method, comprising the following steps:

[0101] S21, placing the diamond 14 with fluorescent defects on the mobile platform 3;

[0102] S22, moving the baffle 4 to a position allowing the first light path 10 to pass through;

[0103] S23, controlling the intensity modulator 13 to adjust the laser intensity to an intensity that causes the defect to emit blue fluorescence but does not induce the formation of fluorescent defects. Generally, the laser intensity during reading is 1 / 10 or less of the laser intensity during writing.

[0104] S24, adjusting the first focusing element 2 so that the laser can be focused on the location of the fluorescent defect, adjusting the second focusing element 5 and the third focusing element 8 to direct the second optical path 11 to the first photodetector 6, and direct the third optical path 12 to the second photodetector 9;

[0105] S25 , moving the movable platform 3 or adjusting the first focusing element 2 to move the focus relative to the diamond 14 , and sequentially reading information of the multiple fluorescent defects.

[0106] More preferably, in S25, filters are placed at the second optical path 11 between the second focusing element 5 and the first photodetector 6 and at the third optical path 12 between the third focusing element 8 and the second photodetector 9, and the first photodetector 6 and the second photodetector 9 are used to detect whether there is fluorescence with a wavelength lower than 500 nm at the position of the fluorescence defect. If the fluorescence wavelength detected by the first photodetector 6 and the second photodetector 9 is lower than 500 nm, the fluorescence defect is valid; if the fluorescence wavelength detected by the first photodetector 6 and the second photodetector 9 is higher than 500 nm, the fluorescence defect is invalid.

[0107] In another embodiment, since the fluorescence defects of diamond will also absorb part of the laser light, the first photodetector 6 can also be used to detect whether there is a weakening phenomenon in the laser light intensity to determine whether there is a fluorescence defect at that position.

[0108] The information written and read is decoded in binary format, with locations with fluorescent defects representing "1" and locations without fluorescent defects representing "0," and vice versa. The diamond is moved horizontally using a mobile platform with a fixed step size greater than the defect size. Binary information is written by controlling whether the laser is used to create fluorescent defects in the diamond.

[0109] The laser emitter 1 emits a red laser (central wavelength greater than 700nm) for reading. The fluorescent defects in the diamond 14 emit blue fluorescence (central wavelength range 350nm-500nm) under the excitation of the red laser. The first photodetector 6 simultaneously obtains the red laser emitted by the laser emitter 1 and the blue fluorescence generated by the fluorescent defects when reading information. The spectral lines of blue light and red light do not overlap at all. The red laser of the laser emitter 1 is easily filtered out by the filter, and the read blue fluorescence is clear and reliable.

[0110] In summary, the embodiment of the present invention provides an information storage device and an information writing and reading method suitable for diamond, which is provided with a movable baffle 4, which can selectively block or allow the laser to be shot to the second focusing element 5 and the first photodetector 6. When the baffle 4 chooses to block the laser from being shot to the second focusing element 5 and the first photodetector 6, the information storage device can perform an information writing operation on the diamond 14. The laser emitter 1 emits a laser, which is focused on the diamond 14 placed on the movable platform 3 through the first focusing element 2. The laser focus induces a fluorescent defect on the diamond 14. The baffle 4 blocks the laser from continuing to transmit, preventing the laser from striking the first photodetector. 6 causes damage; when the baffle 4 chooses to allow the laser to be emitted to the second focusing element 5 and the first photodetector 6, the information storage device can read information from the diamond 14 with a fluorescent defect, the laser emitter 1 emits a laser, which is focused on the fluorescent defect of the diamond 14 placed on the moving platform 3 through the first focusing element 2, and the laser continues to be emitted to the second focusing element 5 and the first photodetector 6. The first photodetector 6 obtains the fluorescence generated by the fluorescent defect of the diamond 14 to realize the reading of the information of the fluorescent defect. The fluorescent defect of the diamond 14 is induced by the same device to write information and read information from the diamond 14 with the fluorescent defect.

[0111] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An information storage device suitable for diamond, characterized in that: include: A first focusing element (2), a movable platform (3), a baffle (4), a second focusing element (5) and a first photodetector (6) are arranged in sequence; A laser emitter (1), wherein the central wavelength of the laser emitted by the laser emitter (1) is greater than 700 nm, and the emitted light of the laser emitter (1) passes through the first focusing element (2), the movable platform (3), the second focusing element (5) in sequence to the first photodetector (6); The movable platform (3) is used to place the diamond (14) and is capable of moving in a horizontal direction; The baffle (4) is capable of moving in a horizontal direction to block or allow the laser to strike the second focusing element (5) and the first photodetector (6).

2. The information storage device suitable for diamond according to claim 1, characterized in that: It also includes a dichroic mirror (7), a third focusing element (8) and a second photodetector (9), wherein the incident end of the dichroic mirror (7) faces the exit port of the laser emitter (1), and the exit end of the dichroic mirror (7) faces the first focusing element (2). When the dichroic mirror (7) receives the laser light emitted by the laser emitter (1), the dichroic mirror (7) is capable of reflecting the laser light to form a first optical path (10) that sequentially passes through the first focusing element (2), the moving platform (3), the second focusing element (5) and finally reaches the first photodetector (6); The blue fluorescence generated by the fluorescent defects of the diamond passes through the second focusing element (5) and the first photodetector (6) in sequence to form a second optical path (11); When the dichroic mirror (7) receives blue fluorescence generated by the fluorescence defect of the diamond (14), the blue fluorescence passes through the first focusing element (2), the dichroic mirror (7), the third focusing element (8), and the second photodetector (9) in sequence to form a third optical path (12).

3. The information storage device suitable for diamond according to claim 2, characterized in that: It also includes an intensity modulator (13), which is arranged between the laser emitter (1) and the dichroic mirror (7).

4. The information storage device suitable for diamond according to claim 1, characterized in that: The laser emitter (1) is a picosecond laser emitter (1) or a femtosecond laser emitter (1).

5. A method for writing information, using the information storage device suitable for diamond according to any one of claims 1 to 4, characterized in that: The steps include: S11, placing the diamond (14) on the mobile platform (3); S12, moving the baffle (4) to a position that blocks the passage of the first light path (10); S13, controlling the laser emitter (1) to emit laser; S14, using the intensity modulator (13) to modulate the intensity of the laser according to preset stored information; S15, adjusting the first focusing element (2) so that the laser is focused on a predetermined writing position of the diamond (14) to induce the formation of the fluorescent defect; S16, moving the movable platform (3) or adjusting the first focusing element (2) so that the focus and the diamond (14) move relative to each other, thereby forming a plurality of fluorescent defects on the diamond (14).

6. The information writing method according to claim 5, characterized in that: In S15 and S16, the second photodetector (9) performs real-time fluorescence monitoring on the fluorescent defect on the diamond (14) to determine whether the fluorescent defect at the current position is successfully written.

7. The information writing method according to claim 5, characterized in that: After S16, the diamond (14) having the fluorescent defect is subjected to a stability test.

8. An information reading method, comprising: using the information storage device for diamond according to any one of claims 1 to 4 to read information from the diamond (14) having the fluorescent defect, wherein: The steps include: S21, fixing the diamond (14) having the fluorescent defect on the mobile platform (3); S22, moving the baffle (4) to a position allowing the first light path (10) to pass through; S23, controlling the intensity modulator (13) to adjust the laser intensity to an intensity that can cause the fluorescent defect to emit blue fluorescence but cannot induce the formation of the fluorescent defect; S24, adjusting the first focusing element (2) so that the laser can be focused on the position where the fluorescent defect is located, adjusting the second focusing element (5) and the third focusing element (8) to guide the second light path (11) to the first photodetector (6), and to guide the third light path (12) to the second photodetector (9); S25, moving the movable platform (3) or adjusting the first focusing element (2) so that the focus and the diamond (14) move relative to each other, and sequentially reading information of the plurality of fluorescent defects.

9. The information reading method according to claim 8, characterized in that: In S25, filters are placed at the second optical path (11) between the second focusing element (5) and the first photodetector (6), and at the third optical path (12) between the third focusing element (8) and the second photodetector (9), respectively. The first photodetector (6) and the second photodetector (9) are used to detect whether there is fluorescence with a central wavelength lower than 500 nm at the position of the fluorescence defect. If the central wavelength of the fluorescence detected by the first photodetector (6) and the second photodetector (9) is lower than 500 nm, the fluorescence defect is valid; if the central wavelength of the fluorescence detected by the first photodetector (6) and the second photodetector (9) is higher than 500 nm, the fluorescence defect is invalid.

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