CN114627902B - Single-pulse all-inorganic multidimensional optical storage method - Google Patents
Single-pulse all-inorganic multidimensional optical storage method Download PDFInfo
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Abstract
The invention discloses a single-pulse all-inorganic multidimensional optical storage method. Firstly, selecting an inorganic material lithium niobate monocrystal as a uniaxial crystal, then fixing the uniaxial crystal on a displacement platform of a processing system, and adjusting the displacement platform to enable the uniaxial crystal to move to a required spatial position; then starting an ultrafast laser in the processing system, using a single-pulse output mode, and controlling the processing system to form a micro-phase change structure in the single-axis crystal to realize writing of an optical data lattice; and finally, processing the uniaxial crystal by using a micro-phase change data lattice reading device to read color polarization signal information of the ultrafast laser, thereby realizing multidimensional storage of the ultrafast laser. The invention realizes the single pulse preparation and the surface reading of the data recording micro-nano structure in the all-inorganic crystal, greatly reduces the writing speed and the data reading difficulty of multidimensional storage, and simultaneously considers the storage life and forcefully promotes the multidimensional optical storage to be practical.
Description
Technical Field
The invention relates to an optical storage method in the technical field of ultra-fast laser micro-nano processing, in particular to a single-pulse all-inorganic multi-dimensional optical storage method.
Background
The multidimensional optical storage technology has wide application prospect in the aspect of long-term storage of large-scale cold data, and the technology writes the coded data into an inorganic transparent medium in the form of an ultrafast laser-induced self-organizing micro-nano structure, can load multiple information on one space position and has the advantages of high storage density and long storage life. At present, the multidimensional optical storage mainly uses a nano grating in quartz glass as a carrier, and the formation of the nano grating requires the combined action of a plurality of pulses, so that the data writing speed is greatly limited. Meanwhile, the capacity threshold generated by the structure is higher, and the power consumption required by data writing is increased. In addition, the multidimensional information reading of the nano grating needs a complex optical system, and the cost of data reading is increased. The reported single-pulse multidimensional data storage is seriously dependent on an organic medium, and the service life and the stability of the storage are difficult to be considered. With the development of multidimensional optical storage technology to high speed, low energy consumption and low cost, the traditional method is more and more difficult to adapt to the increasingly complex demands of future large data storage.
The ultra-fast laser induced self-organizing micro-phase transformation is a material modification technology for inducing nano-scale periodic phase transformation of a material in a focal region by utilizing nonlinear ionization excited by light pulses with high peak energy. The technology mainly induces and establishes a high-intensity spatial interference field in a focus area through the interaction of strong-field laser and substances, and realizes the rapid generation of a high-precision nano structure breaking through the optical diffraction limit in a transparent medium by matching with the nonlinear multiphoton absorption effect of materials on ultrafast laser.
Disclosure of Invention
In order to overcome the common problems of the prior multidimensional optical storage, the invention provides a multidimensional optical storage method based on uniaxial crystal color polarization and ultrafast laser-induced self-organizing micro-phase change, which realizes single pulse preparation and surface reading of a data recording micro-nano structure in an all-inorganic crystal, greatly reduces the writing speed and the data reading difficulty of multidimensional storage, simultaneously takes the storage life into consideration, and forcefully pushes the multidimensional optical storage to become practical.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
1. a single pulse all-inorganic multidimensional optical storage method specifically comprises the following steps:
step S1: selecting a Z-direction cut inorganic material lithium niobate monocrystal as a uniaxial crystal, fixing the uniaxial crystal on a displacement platform in a femtosecond laser processing system, enabling the direction of the optical axis of the uniaxial crystal to be parallel to the XY plane of the displacement platform, and adjusting the displacement platform to enable the uniaxial crystal to move to a spatial position required by data writing; the spatial position parameters are as follows: the processing depth is 20-1000 μm, and the interval between data layers is 20-100 μm.
Step S2: starting an ultrafast laser in the femtosecond laser processing system, using a single pulse output mode, and then controlling the femtosecond laser processing system to form a micro-phase transformation structure at a single-axis crystal irradiation point so as to realize writing of an optical data lattice;
step S3: and processing the object to be detected containing the optical data lattice by using a micro-phase data lattice reading device to finish reading the color polarization signal information of the ultrafast laser and realize multidimensional storage of the ultrafast laser.
The step S2 specifically comprises the following steps: firstly, introducing parameters of ultra-fast laser into a computer in a femtosecond laser processing system; and then the computer controls the spatial light modulator to adjust the phase and the spatial distribution of the ultrafast laser so as to generate an optical data lattice carrying data information. The parameters of the ultrafast laser are as follows: setting an initial average power value to 3000mW and a pulse width to 0.2-8ps so as to ensure the stability of ultra-fast laser output; and then the attenuator controls the single pulse energy of each irradiation point in the optical data lattice to be 10-1000nJ, the optical data lattice transmitted from the attenuator is reflected by the reflector and then enters the objective lens, and then is focused in the single-axis crystal after being transmitted through the objective lens, so that a micro-phase transformation structure with alternately arranged glass phase and crystal is formed in the focusing position of the single-axis crystal, and finally the writing of the optical data lattice is realized.
The step S3 specifically comprises the following steps: firstly, a polarizer converts light emitted by a white light source into linearly polarized light; and then the linearly polarized light is incident to the uniaxial crystal along the direction perpendicular to the optical axis of the uniaxial crystal, and forms O light and E light after double refraction occurs in the uniaxial crystal, the O light and the E light are interfered after being transmitted through an analyzer to form color polarized signals with different colors, and then the color polarized signals with different colors are transmitted through a lens and then received by a detector, so that the reading of color polarized signal information of the ultrafast laser is completed, and the multidimensional storage of the ultrafast laser is realized.
2. A system for femtosecond laser machining:
the femtosecond laser processing system comprises an ultrafast laser, a shutter, an attenuator, a gram Taylor prism, a half wave plate, a first total reflecting mirror, a second total reflecting mirror, a spatial light modulator, a lens group, a reflecting mirror, an objective lens and a displacement platform;
the shutter, the attenuator, the gram Taylor prism, the half wave plate, the first total reflecting mirror, the spatial light modulator, the second total reflecting mirror, the lens group, the reflecting mirror, the objective lens and the displacement platform are sequentially arranged in sequence;
the ultra-fast laser emitted by the ultra-fast laser is transmitted through the shutter, the attenuator and the gram Taylor prism in sequence and then enters the half-wave plate, the ultra-fast laser is transmitted through the half-wave plate and then enters the lens group after being reflected through the first total reflection mirror, the spatial light modulator and the second total reflection mirror, the ultra-fast laser is transmitted through the lens group and then reflected to the objective lens through the reflection mirror, and the ultra-fast laser is transmitted through the objective lens and then enters the displacement platform.
The femtosecond laser processing system further comprises a computer, wherein the computer is electrically connected with the ultrafast laser, the shutter, the attenuator, the half wave plate and the spatial light modulator respectively, and a control port of the displacement platform is also electrically connected with the computer.
3. A micro-phase data point array reading device comprises:
the micro-phase data point array reading device in the step S3 comprises a white light source, a polarizer, an analyzer, a lens and a detector;
the detector, the lens, the analyzer, the polarizer and the white light source are arranged in parallel and opposite direction from top to bottom at intervals; the object to be measured is arranged between the polarizer and the analyzer, the polarizer and the analyzer are polaroids, the extinction ratio is more than 1000, and the polarization directions of the polarizer and the analyzer are not perpendicular to each other or parallel to each other; the light emitted by the white light source is received by the detector after passing through the polarizer, the object to be detected, the analyzer and the lens.
The object to be measured is the uniaxial crystal with the micro-phase transformation structure obtained in the step S2.
The difference of refractive indexes of the O light and the E light is larger than 0.1, and the difference of refractive indexes of a glass phase and a crystal phase in the micro-phase transformation structure is larger than 0.3, and when the property of the uniaxial crystal does not meet the standard of the difference of refractive indexes, the uniaxial crystal is doped or replaced to meet the requirement.
The optical data lattice in the step S2 is generated by the spatial light modulator in one step according to the type of information to be stored, the optical data lattice is a coded lattice, the laser irradiation parameters of each point in the lattice are controllable, and the lattice is a pattern formed by points with different parameters or a pattern formed by points with the same parameters; the space position of the optical data lattice irradiation is realized by the movement of a displacement platform.
The micro-phase change structure is induced by ultrafast laser in the uniaxial crystal and is used for increasing the phase difference between O light and E light so as to enhance linearly polarized light entering the uniaxial crystal.
The invention has the following beneficial effects:
the invention utilizes the ultra-fast laser to induce the interference field of the focal region in the crystal medium to realize the micro-phase change structure in the single-axis crystal, and can generate the glass-crystal periodic structure by using a single pulse, the micro-nano structure is completely generated by self-organization, the complex optical system and the precise mask plate are not relied on, the large-scale information writing only needs to generate a data lattice through the spatial light modulator, and then the single pulse irradiation can be carried out, thereby greatly improving the data writing efficiency and solving the problem of insufficient storage and writing efficiency of the inorganic medium Gao Weiguang.
The invention realizes the preparation of the self-organizing periodic structure by utilizing the multiphoton absorption process initiated by the interaction of the ultrafast laser and the inorganic matter. This process is a typical nonlinear effect, depends strongly on the laser intensity, has low requirements on materials, can induce micro-phase change structures in various crystals except lithium niobate, has higher universality for high-dimensional data storage based on the technology, greatly increases the available crystal material range, does not need to additionally develop a storage medium, can effectively reduce the data storage cost, and simultaneously improves the standardization degree of high-dimensional optical storage.
The optical signal of the micro phase change structure is added with the color polarization signal on the basis of XYZ three-coordinate, double refraction signal and slow axis orientation angle, so that the optical information multiplexing dimension reaches six dimensions, six-dimensional data storage is realized, and the density of high-dimensional information storage is greatly improved. Meanwhile, the reading of the color polarization signal loaded with the sixth-dimensional information is very simple, and can be realized only by matching the LED white light source with a pair of polaroids and an optical camera, so that the information reading cost is greatly reduced. In addition, devices required by color polarization signal reading can be miniaturized, and the integration degree of high-dimensional data storage can be effectively improved.
The Gao Weiguang storage device has the core part of a glass phase-crystal phase micro-phase change structure, is embedded into a crystal material, has stable physical and chemical properties, can bear high temperature and high pressure, is insensitive to external corrosion and pollution, and has extremely high stability and storage life compared with organic medium storage.
Drawings
Fig. 1 is a schematic view of the overall construction of the present invention.
Fig. 2 is a schematic diagram of the apparatus for preparing the micro-phase change structure in fig. 1.
Fig. 3 is a schematic view of the data extraction device of fig. 1.
Fig. 4 is a graph of the results of a read experiment of microphase-change structural color polarization signals.
Fig. 5 is a schematic diagram of the working principle of micro phase change optical storage technology.
The figure shows: 1-computer, 2-ultrafast laser, 3-shutter, 4-attenuator, 5-gram taylor prism, 6-half wave plate, 71-first total reflection mirror, 72-second total reflection mirror, 8-spatial light modulator, 9-lens group, 10-reflection mirror, 11-objective lens, 12-micro phase change structure, 13-uniaxial crystal, 14-displacement platform, 15-white light source, 16-polarizer, 17-optical axis, 18-analyzer, 19-lens, 20-detector, 21-object to be measured.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
As shown in fig. 1, the implementation process of the present invention includes the following steps:
step S1: the method comprises the steps of selecting a Z-direction cut inorganic material lithium niobate monocrystal as a uniaxial crystal 13, fixing the uniaxial crystal 13 on a displacement platform 14 in a femtosecond laser processing system, enabling the direction of an optical axis 17 of the uniaxial crystal 13 to be parallel to an XY plane of the displacement platform 14, enabling the incidence direction of ultrafast laser emitted by an ultrafast laser 2 to be perpendicular to the direction of the optical axis 17 of the uniaxial crystal 13, and adjusting the displacement platform 14 to enable the uniaxial crystal 13 to move to a space position required by data writing. Specifically, the spatial position parameters are: the processing depth is 20-1000 μm, and the interval between data layers is 20-100 μm.
Step S2: starting an ultrafast laser 2 in a femtosecond laser processing system, using a single pulse output mode, and then controlling the femtosecond laser processing system to form a micro-phase change structure 12 at an irradiation point of a single-axis crystal 13 according to actual requirements, and writing an optical data lattice by utilizing the phase modulation capability of the micro-phase change structure 12 to light; specifically, as shown in fig. 1, the ultrafast laser 2 outputs a single-pulse ultrafast laser, after the micro-phase change structure 12 is induced inside the uniaxial crystal 13, the displacement platform 14 is started to enable the uniaxial crystal 13 to move to a set position relative to the objective lens 11, and then the ultrafast laser 2 is started to output another single-pulse ultrafast laser to induce a new micro-phase change structure 12, so that the data writing is realized.
Step S3: and processing the object 21 to be detected containing the optical data lattice by using a micro-phase data lattice reading device to finish reading the color polarization signal information of the ultrafast laser and realize multidimensional storage of the ultrafast laser.
As shown in fig. 2, the femtosecond laser processing system includes an ultrafast laser 2, a shutter 3, an attenuator 4, a gram taylor prism 5, a half-wave plate 6, a first total reflection mirror 71, a second total reflection mirror 72, a spatial light modulator 8, a lens group 9, a reflection mirror 10, an objective lens 11, and a displacement stage 14;
the shutter 3, the attenuator 4, the gram taylor prism 5, the half-wave plate 6, the first total reflection mirror 71, the spatial light modulator 8, the second total reflection mirror 72, the lens group 9, the reflection mirror 10, the objective lens 11, and the displacement stage 14 are sequentially arranged in this order; the method comprises the steps of carrying out a first treatment on the surface of the
The ultra-fast laser emitted by the ultra-fast laser 2 is transmitted through the shutter 3, the attenuator 4 and the gram taylor prism 5 in sequence and then enters the half-wave plate 6, the ultra-fast laser is transmitted through the half-wave plate 6 and then enters the lens group 9 after being reflected by the first total reflection mirror 71, the spatial light modulator 8 and the second total reflection mirror 72, and the ultra-fast laser is transmitted through the lens group 9 and then enters the objective lens 11 after being reflected by the reflection mirror 10, and then enters the displacement platform 14 after being transmitted through the objective lens 11; the ultra-fast laser 2 is used for controlling the output power, the repetition frequency and the pulse width of the laser; the shutter 3 is opened and closed to control the passage and disconnection of the light beam; the attenuator 4 is used for regulating and controlling the average power of the ultrafast laser; the gram taylor prism 5 and the half-wave plate 6 are used for controlling the polarization direction of the ultrafast laser beam; the first total reflection mirror 71 is used to guide the light beam into the spatial light modulator 8; the spatial light modulator 8 adjusts the phase and the spatial distribution of the ultrafast laser so as to generate an optical data lattice carrying data information and control the polarization state of each point; the second total reflection mirror 72 is for guiding the light beam into the lens group 9; the lens group 9 is used for observing imaging effect and regulating and controlling the size of the light spot; the mirror 10 and the objective lens 11 are used to focus the light beam inside the uniaxial crystal 13 to form a micro-phase change structure 12; the displacement stage 14 controls the coordinate position of XYZ space where the optical data lattice generated by the spatial light modulator 8 is written.
The femtosecond laser processing system also comprises a computer 1, wherein the computer 1 is respectively and electrically connected with the ultrafast laser 2, the shutter 3, the attenuator 4, the half-wave plate 6 and the spatial light modulator 8, so as to realize the control of laser parameters. And the control port of the displacement platform 14 is also electrically connected with the computer 1 for controlling the three-dimensional movement of the uniaxial crystal 13.
Specifically, the irradiation of the ultrafast laser in the uniaxial crystal 13 forms a nanoscale ionization center in the focal region, the nanoscale ionization center expands into a sheet shape due to anisotropy under the effect of the local field enhancement effect of the ultrafast laser to form an anisotropic ionization center, and the uniaxial crystal 13 is subjected to periodic glass transition under the effect of the anisotropic ionization center to form a periodic micro-phase change structure 12 in which glass phases and crystal phases are alternately arranged, wherein the refractive index difference of the glass phases and the crystal phases reaches more than 0.3, so that the refractive index of the irradiation region of the ultrafast laser shows periodic distribution. Because the ionization center is only in the nonlinear ionization region of the focusing point center, the optical diffraction limit can be broken through, the periodic vitrification has sub-wavelength precision, the orientation of the periodic vitrification is vertical to the polarization direction of the ultrafast laser, the period of the self-assembly modification generated grating is generally about 200nm, and the line width of the grating is about 20nm, so that the structure has the phase modulation capability and shows high signal-to-noise interference color under the irradiation of white light. Subsequently, reading of the data is achieved by the integrated color polarization imaging device.
The step S2 specifically comprises the following steps: in the femtosecond laser processing system, firstly, parameters of the ultrafast laser are imported into a computer 1, wherein the parameters of the ultrafast laser are as follows: setting an initial average power value to 3000mW and a pulse width to 4ps to ensure the stability of ultra-fast laser output; then the computer 1 controls the spatial light modulator 8 to adjust the phase and the spatial distribution of the ultrafast laser according to the data information which is required to be stored, so as to generate an optical data lattice carrying the data information; then the attenuator 4 controls the single pulse energy at each irradiation point in the optical data lattice to be 1000nJ, the optical data lattice transmitted from the attenuator 4 is reflected by the reflecting mirror 10 and then enters the objective 11, and then is focused in the uniaxial crystal 13 after being transmitted through the objective 11, so that a glass phase-crystal phase alternately arranged micro-phase structure 12 with the refractive index being distributed periodically is formed in the focusing position of the uniaxial crystal 13, and the writing of the optical data lattice is finally realized by utilizing the phase modulation capability of the micro-phase structure 12 to light.
As shown in fig. 3, the micro-phase data point array reading device in step S3 includes a white light source 15, a polarizer 16, an analyzer 18, a lens 19 and a detector 20;
the detector 20, the lens 19, the analyzer 18, the polarizer 16 and the white light source 15 are arranged in parallel and opposite directions from top to bottom at intervals; the object 21 to be measured is arranged between the polarizer 16 and the analyzer 18, the polarizer 16 and the analyzer 18 are polaroids, the extinction ratio is more than 1000, the polarization directions of the polarizer 16 and the analyzer 18 are not perpendicular to each other, are not parallel to each other, are at a certain angle, and the angle is selected so as to obtain the strongest color polarization signal; the light emitted by the white light source 15 passes through the polarizer 16, the object 21 to be measured, the analyzer 18 and the lens 19, and is received by the detector 20, so that the reading of the color polarization signal is realized as shown in fig. 4.
The object 21 to be measured is the uniaxial crystal 13 having the micro-phase change structure 12 formed obtained in step S2.
The step S3 specifically comprises the following steps: first, the polarizer 16 converts the light emitted from the white light source 15 into linearly polarized light; then, the linearly polarized light is incident to the uniaxial crystal 13 along the direction perpendicular to the optical axis 17 of the uniaxial crystal 13, and forms O light and E light after being subjected to birefringence in the uniaxial crystal 13, the O light and the E light are transmitted through the analyzer 18 and are interfered to form color polarized signals with different colors, and then the color polarized signals with different colors are transmitted through the lens 19 and are received by the detector 20, so that the reading of color polarized signal information of the ultrafast laser is completed, and the multidimensional storage of the ultrafast laser is realized. Specifically, the light emitted by the white light source 15 is changed into purer linearly polarized light through the polarizer 16, the polarized light is divided into O light and E light through the crystal, the propagation directions of the O light and the E light in the uniaxial crystal 13 are the same, after passing through the micro-phase transformation structure 12, the O light and the E light in a specific wave band have phase conditions of interference constructive, and when the O light and the E light pass through the analyzer 18, the O light and the E light finally have interference conditions, and excellent polarization signals are expressed. The color polarized signals are collected by the detector 20 after being imaged by the lens 19, and the stored data information is obtained by a data decoding algorithm. And because the orientation of the micro phase change structure 12 has polarization dependence, the micro phase change structure 12 written by different polarization can have different colors, thereby realizing multi-dimensional storage of ultra-fast laser.
The difference of refractive indexes of the O light and the E light is larger than 0.1, and the difference of refractive indexes of a glass phase and a crystal phase in the micro-phase transformation structure 12 is larger than 0.3, and when the property of the uniaxial crystal 13 does not meet the standard of the difference of refractive indexes, the uniaxial crystal 13 is made to meet the requirement by doping or replacing the uniaxial crystal 13.
The optical data lattice in the step S2 is generated by the spatial light modulator 8 according to the type of information to be stored in one step, the optical data lattice is a coded lattice, the laser irradiation parameters of each point in the lattice are controllable, and the lattice is a pattern formed by points with different parameters or a pattern formed by points with the same parameters; the spatial position of the optical data lattice illumination is achieved by the movement of the displacement stage 14. Specifically, each point in the optical data lattice is composed of a micro-phase change structure, the processing of the lattice is single pulse processing, and only one ultrafast pulse is required to be incident for generating each lattice.
The micro-phase change structure 12 is induced by the ultrafast laser inside the uniaxial crystal 13 to increase the phase difference between the O light and the E light, thereby enhancing the linearly polarized light incident to the uniaxial crystal 13. Preferably, the illumination light source for reading the dot matrix information is a collimated white light source, and the dot matrix information is read by adopting a photoelectric detector with a color imaging function.
In summary, the basic working principle of the micro-phase-change optical storage technology is shown in fig. 5, that is, the ultra-fast laser incident perpendicular to the optical axis 17 is focused by the objective lens 11, writing of the micro-phase-change structure 12 is implemented in the uniaxial crystal 13, and then the color polarization signal carried by the micro-phase-change structure 12 is read by the data extraction device composed of the white light source 15, the polarizer 16, the analyzer 18, the lens 19 and the detector 20.
Claims (9)
1. A single pulse all-inorganic multidimensional optical storage method is characterized in that: the method specifically comprises the following steps:
step S1: selecting a Z-direction cut inorganic material lithium niobate single crystal as a single-axis crystal (13), fixing the single-axis crystal (13) on a displacement platform (14) in a femtosecond laser processing system, enabling the direction of an optical axis (17) of the single-axis crystal (13) to be parallel to an XY plane of the displacement platform (14), and adjusting the displacement platform (14) to enable the single-axis crystal (13) to move to a space position required by data writing;
step S2: starting an ultrafast laser (2) in the femtosecond laser processing system, using a single pulse output mode, and then controlling the femtosecond laser processing system to form a micro-phase change structure (12) at an irradiation point of a single-axis crystal (13) so as to realize writing of an optical data lattice;
step S3: processing an object (21) to be detected containing an optical data lattice by using a micro-phase data point array reading device to finish reading color polarization signal information of the ultrafast laser and realize multidimensional storage of the ultrafast laser;
the micro-phase data point array reading device in the step S3 comprises a white light source (15), a polarizer (16), an analyzer (18), a lens (19) and a detector (20); the detector (20), the lens (19), the analyzer (18), the polarizer (16) and the white light source (15) are arranged in parallel from top to bottom at intervals and opposite to each other; the object to be detected (21) is arranged between the polarizer (16) and the analyzer (18), the polarizer (16) and the analyzer (18) are polaroids, the extinction ratio is greater than 1000, and the polarization directions of the polarizer (16) and the analyzer (18) are neither perpendicular to each other nor parallel to each other; the light emitted by the white light source (15) passes through the polarizer (16), the object to be detected (21), the analyzer (18) and the lens (19) and is received by the detector (20).
2. The single pulse all-inorganic multi-dimensional optical storage method of claim 1, wherein: the femtosecond laser processing system comprises an ultrafast laser (2), a shutter (3), an attenuator (4), a gram taylor prism (5), a half-wave plate (6), a first total reflection mirror (71), a second total reflection mirror (72), a spatial light modulator (8), a lens group (9), a reflection mirror (10), an objective lens (11) and a displacement platform (14);
the shutter (3), the attenuator (4), the gram taylor prism (5), the half-wave plate (6), the first total reflection mirror (71), the spatial light modulator (8), the second total reflection mirror (72), the lens group (9), the reflection mirror (10), the objective lens (11) and the displacement platform (14) are sequentially arranged in sequence;
the ultra-fast laser emitted by the ultra-fast laser (2) is transmitted through the shutter (3), the attenuator (4) and the gram Taylor prism (5) in sequence and then enters the half-wave plate (6), the ultra-fast laser is transmitted through the half-wave plate (6) and then enters the lens group (9) after being reflected through the first total reflection mirror (71), the spatial light modulator (8) and the second total reflection mirror (72), the ultra-fast laser is transmitted through the lens group (9) and then is reflected to the objective lens (11) through the reflection mirror (10), and the ultra-fast laser is transmitted through the objective lens (11) and then enters the displacement platform (14).
3. The single pulse all-inorganic multi-dimensional optical storage method of claim 2, wherein: the femtosecond laser processing system further comprises a computer (1), wherein the computer (1) is electrically connected with the ultrafast laser (2), the shutter (3), the attenuator (4), the half-wave plate (6) and the spatial light modulator (8) respectively, and a control port of the displacement platform (14) is also electrically connected with the computer (1).
4. A single pulse all-inorganic multi-dimensional optical storage method according to claim 3, characterized in that: the step S2 specifically comprises the following steps: in a femtosecond laser processing system, firstly, parameters of ultra-fast laser are imported into a computer (1); then the computer (1) controls the spatial light modulator (8) to adjust the phase and the spatial distribution of the ultrafast laser, so as to generate an optical data lattice carrying data information; then the attenuator (4) controls the single pulse energy on each irradiation point in the optical data lattice, the optical data lattice transmitted from the attenuator (4) is reflected by the reflector (10) and then enters the objective (11), and then is focused in the uniaxial crystal (13) after being transmitted by the objective (11), so that a glass phase-crystal alternately arranged micro-phase change structure (12) is formed in the focusing position of the uniaxial crystal (13), and finally the writing of the optical data lattice is realized.
5. The single pulse all-inorganic multi-dimensional optical storage method of claim 1, wherein: the object (21) to be measured is the uniaxial crystal (13) having the micro-phase change structure (12) formed obtained in the step S2.
6. The single pulse all-inorganic multi-dimensional optical storage method of claim 1, wherein: the step S3 specifically comprises the following steps: firstly, a polarizer (16) converts light emitted by a white light source (15) into linearly polarized light; and then the linearly polarized light is incident into the uniaxial crystal (13) along the direction perpendicular to the optical axis (17) of the uniaxial crystal (13), O light and E light are formed after double refraction occurs in the uniaxial crystal (13), the O light and the E light are interfered after being transmitted through the analyzer (18) to form color polarized signals with different colors, and then the color polarized signals with different colors are received by the detector (20) after being transmitted through the lens (19), so that the reading of color polarized signal information of the ultrafast laser is completed, and the multidimensional storage of the ultrafast laser is realized.
7. The single pulse all-inorganic multi-dimensional optical storage method of claim 6, wherein: the difference of refractive indexes of the O light and the E light is larger than 0.1, the difference of refractive indexes of a glass phase and a crystal phase in the micro-phase transformation structure (12) is larger than 0.3, and when the property of the uniaxial crystal (13) does not meet the standard of the difference of refractive indexes, the uniaxial crystal (13) is enabled to meet the requirement by doping or replacing the uniaxial crystal (13).
8. The single pulse all-inorganic multi-dimensional optical storage method of claim 4, wherein: the optical data lattice in the step S2 is generated by a spatial light modulator (8) according to the type of information to be stored in one step, the optical data lattice is a coded lattice, the laser irradiation parameters of each point in the lattice are controllable, and the lattice is a pattern formed by points with different parameters or a pattern formed by points with the same parameters; the spatial position of the optical data lattice illumination is realized by the movement of a displacement platform (14).
9. The single pulse all-inorganic multi-dimensional optical storage method of claim 6, wherein: the micro-phase change structure (12) is induced by ultra-fast laser in the uniaxial crystal (13) and is used for increasing the phase difference between O light and E light and further enhancing linearly polarized light entering the uniaxial crystal (13).
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