Random laser coherence dynamic information encryption device and use method

Abstract

The invention relates to a random laser coherence dynamic information encryption device and a use method, to-be-encrypted information is converted into binary codes through binary coding, and digits in the binary codes correspond to voltage applied by a direct current power supply, so that the voltage applied to a random laser sample is controlled according to the binary codes; therefore, the spatial coherence and the light intensity of the emergent laser emitted by the random laser excitation device are changed, and the emergent laser corresponding to the binary code is output at the same time. After the emergent laser passes through the spatial coherence observation device and generates interference fringes, the emergent laser is transmitted to the spatial coherence analysis system to obtain binary codes corresponding to spatial coherence in the interference fringes, and then encrypted information is obtained based on the binary codes, so that the rapid, simple and convenient encryption, decryption and transmission process of the to-be-encrypted information is completed. And meanwhile, encryption can be carried out in combination with information such as wavelength and phase of laser, so that the encryption flexibility of the laser is improved.

Description

Technical Field

[0001] The present invention relates to the field of laser encryption technology, and in particular to a random laser coherence dynamic information encryption device and a use method thereof. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the rapid development of information technology, the security protection of information data has become increasingly important, and information encryption is a key measure to protect data security; at the same time, with the continuous evolution of technology, information encryption technology is also being continuously optimized and updated to cope with the increasingly complex network security environment. Laser encryption, as a special encryption method, can effectively protect information data based on the characteristics of high security and multi-dimensional space, and improve the security of data during transmission.

[0004] Existing laser encryption methods are usually spectral encryption, which distinguishes the spectrum and defines the encoding based on the differences in parameters such as the wavelength, focal length, phase and diffraction distance of the light. However, during the encryption process, the calculation complexity is high, the data transmission volume is large, and the key management is complex, which makes the encryption and decryption process very slow and the transmission efficiency is relatively low, resulting in the inflexibility of spectral encryption. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a random laser coherence dynamic information encryption device and a method for using the same. The voltage applied to the random laser sample is changed by a DC power supply, thereby changing the spatial coherence and light intensity of the output laser emitted by the random laser. At the same time, coding encryption is combined to utilize the spatial coherence and light intensity to encrypt and transmit information data, thereby achieving accurate data transmission while improving the flexibility of laser encryption.

[0006] The purpose of the present invention is to provide a random laser coherence dynamic information encryption device, comprising a random laser excitation device, a DC power supply, a spatial coherence observation device, and a spatial coherence analysis system;

[0007] The random laser excitation device includes a random laser sample, and the random laser excitation device excites the random laser sample by irradiating laser light on the random laser sample;

[0008] The DC power supply is used to change the spatial coherence and light intensity of the emitted laser light emitted by the random laser excitation device by changing the voltage applied to the random laser sample;

[0009] The spatial coherence observation device is used to observe and record the spatial coherence and light intensity of the outgoing laser light according to the interference fringes generated by the outgoing laser light emitted by the random laser excitation device after passing through the double-slit grating;

[0010] The spatial coherence analysis system is used to receive the interference fringes observed and recorded by the spatial coherence observation device and perform visibility analysis.

[0011] As a further technical solution, the random laser excitation device includes a pulse laser, a half-wave plate, a polarizer, a first beam splitter, an energy meter, a cylindrical lens and a random laser sample arranged in sequence along the optical path. After the laser pulse emitted by the pulse laser passes through the half-wave plate, the polarizer and the first beam splitter in sequence, one beam of light enters the energy meter to record the energy, and the other beam of light passes through the cylindrical lens and is irradiated on the random laser sample to excite it.

[0012] As a further technical solution, the random laser sample is prepared by two pieces of antiparallel friction-oriented ITO conductive glass, which are filled with a solution; the solution is first formed by mixing nematic liquid crystal and DCM dye in a mass ratio of 99.5%:0.5% to form a liquid crystal and DCM solution, and then mixed evenly with a gold nano solution in a volume ratio of 8:1.

[0013] As a further technical solution, the DC power supply is used to apply two different voltages to the random laser sample, namely a first voltage and a second voltage; the voltage value of the first voltage is smaller than the voltage value of the second voltage.

[0014] As a further technical solution, when the DC power supply applies a first voltage to the random laser sample, the nematic liquid crystal molecules in the random laser sample are arranged according to a preset orientation; when the DC power supply applies a second voltage to the random laser sample, the arrangement direction of the nematic liquid crystal molecules is perpendicular to the orientation arrangement direction, thereby changing the refractive index of the nematic liquid crystal molecules and controlling the spatial coherence and light intensity of the emitted laser.

[0015] As a further technical solution, the spatial coherence observation device includes a first convex lens, a filter, a second beam splitter, a fiber spectrometer, a second convex lens, a double-slit grating, a third convex lens and a CCD camera arranged in sequence along the optical path. After the output laser emitted by the random laser excitation device passes through the first convex lens, the filter and the second beam splitter in sequence, one beam of light enters the fiber spectrometer to record the spectrum of the output laser, and the other beam of light passes through the second convex lens, the double-slit grating and the third convex lens in sequence, and the interference fringes generated are recorded and saved by the CCD camera.

[0016] A method for using a random laser coherence dynamic information encryption device, comprising:

[0017] Install the DC power supply on the random laser sample and turn on the energy meter, fiber spectrometer, and CCD camera;

[0018] The laser pulse emitted by the pulse laser passes through a half-wave plate, a polarizer, a first beam splitter and a cylindrical lens, and then irradiates the pump light onto a random laser sample to excite it, and the energy is recorded by an energy meter;

[0019] The output laser emitted by the random laser excitation device passes through the first convex lens, the filter, the second beam splitter and the second convex lens, and then irradiates the double-slit grating. The transmitted interference fringes are converged by the third convex lens and recorded on the CCD camera. At the same time, the spectrum of the output laser emitted by the random laser excitation device is recorded at any time by the optical fiber spectrometer.

[0020] Based on binary coding, the information to be encrypted is converted into binary code and represented by a combination of numbers 0 and 1; according to the DC power supply voltage application method and the binary code after the encrypted information is converted, the DC power supply is controlled to apply a voltage value to the random laser sample, thereby changing the spatial coherence and light intensity of the output laser emitted by the random laser excitation device, and outputting the output laser corresponding to the binary code;

[0021] The interference fringes generated by the outgoing laser passing through the double-slit grating are recorded by a CCD camera. At the same time, the spectrum of the outgoing laser emitted by the random laser excitation device is recorded at any time by a fiber optic spectrometer. The interference fringes and spectrum are transmitted to the spatial coherence analysis system in real time, and the visibility of the interference fringes is analyzed to obtain encrypted information.

[0022] As a further technical solution, the DC power supply voltage application method is specifically as follows: when the number in the binary code is 0, the DC power supply applies a first voltage to the random laser sample, and the spatial coherence of the emitted laser is defined as "0" at this time; when the number in the binary code is 1, the DC power supply applies a second voltage to the random laser sample, and the spatial coherence of the emitted laser is defined as "1" at this time.

[0023] As a further technical solution, the encrypted information is obtained specifically by analyzing the visibility of the interference fringes to obtain a binary code corresponding to the spatial coherence in the interference fringes, and then obtaining the encrypted information based on the binary code.

[0024] As a further technical solution, the binary code is specifically ASCII code.

[0025] Beneficial effects of one or more of the above technical solutions:

[0026] The present invention converts information to be encrypted into binary code through binary coding, and makes the numbers in the binary code correspond to the voltage applied by a DC power supply, so as to control the voltage applied to the random laser sample according to the binary code converted from the encrypted information, thereby changing the spatial coherence and light intensity of the output laser emitted by the random laser excitation device, and outputting the output laser corresponding to the binary code at the same time; and after the output laser passes through the spatial coherence observation device and generates interference fringes, it is transmitted to the spatial coherence analysis system to obtain the binary code corresponding to the spatial coherence in the interference fringes, and then the encrypted information is obtained based on the binary coding, thereby completing the fast and simple encryption, decryption and transmission process of the encrypted information; at the same time, it can be combined with information such as the wavelength and phase of the laser for encryption, so as to improve the flexibility of laser encryption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification that constitute a part of this application are used to provide further understanding of the present application. In order to facilitate understanding, the proportions between the structures of each part are adjusted. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0028] Figure 1 This is a structural diagram of a random laser coherence dynamic information encryption device of the present invention.

[0029] FIG. 2( a ) is a diagram showing the arrangement of the internal nematic liquid crystal molecules of the random laser sample of the present invention when no voltage is applied, voltage is applied, and saturation voltage is applied.

[0030] FIG2( b ) is a normalized graph showing the intensity distribution of interference fringes of the outgoing laser light emitted from the random laser excitation device of the random laser sample of the present invention when no voltage is applied, voltage is applied, and saturation voltage is applied.

[0031] Figure 3(a) is a schematic diagram of a random laser sample when no voltage is applied.

[0032] Figure 3(b) is a schematic diagram of the random laser sample when a saturation voltage is applied.

[0033] Figure 3(c) shows the normalized intensity distribution of the interference fringes corresponding to the outgoing laser light emitted by the random laser excitation device when no voltage (0 V) and saturation voltage (20 V) are applied to the random laser sample, the interference fringes visibility and the corresponding binary code.

[0034] Figure 4 This is a graph showing the changes when different voltages are applied to the random laser sample during the encryption process.

[0035] Figure 5 The flowchart of encrypting and decrypting the encrypted information based on random laser sample array.

[0036] Among them, 1. pulse laser, 2. half-wave plate, 3. polarizer, 4. first beam splitter, 5. energy meter, 6. cylindrical lens, 7. DC power supply, 8. random laser sample, 9. first convex lens, 10. filter, 11. second beam splitter, 12. fiber spectrometer, 13. second convex lens, 14. double-slit grating, 15. third convex lens, 16. CCD camera, 17. spatial coherence analysis system. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 , clearly and completely describe the technical solutions in the embodiments of the present invention.

[0038] Embodiment 1

[0039] Reference Figure 1 , a random laser coherence dynamic information encryption device, including a random laser excitation device, a DC power supply 7, a spatial coherence observation device, and a spatial coherence analysis system.

[0040] Specifically, the random laser excitation device includes a pulse laser 1, a half-wave plate 2, a polarizer 3, a first beam splitter 4, an energy meter 5, a cylindrical lens 6 and a random laser sample 8 which are sequentially arranged along the optical path. In this embodiment, the random laser excitation device excites the random laser sample 8 by irradiating the laser on it; wherein, the pulse laser 1 adopts a frequency-doubled Q-switched neodymium-doped yttrium aluminum garnet laser with a wavelength of 532nm, a repetition frequency of 10Hz, and a pulse duration of 20ps; and the laser pulse emitted by the pulse laser 1 first passes through the half-wave plate 2 for energy attenuation, then passes through the polarizer 3 to make the pump light become linearly polarized light, and then passes through the first beam splitter 4 to be divided into two beams of light, one of which converges on the energy meter 5 to measure the energy of the laser, and the other beam of light passes through the cylindrical lens 6 to generate a linear light source to irradiate the random laser sample 8, thereby realizing the excitation of the random laser sample 8. The energy meter 5 is to ensure that the pulse laser emitted by the pulse laser 1 can excite the random laser sample 8.

[0041] In this embodiment, the random laser sample 8 is prepared by two pieces of ITO conductive glass with antiparallel friction orientation, which are filled with a solution; the solution is firstly mixed with nematic liquid crystal and DCM dye in a mass ratio of 99.5%:0.5% to form a liquid crystal and DCM solution, and then evenly mixed with a gold nano solution in a volume ratio of 8:1.

[0042] As shown in FIG2(a), when different voltages are applied to the random laser sample 8, the arrangement direction of the nematic liquid crystal molecules inside the random laser sample 8 will change, thereby changing the refractive index of the nematic liquid crystal molecules, and finally changing the spatial coherence and light intensity of the output laser light emitted by the random laser excitation device. The DC power supply 7 is used to change the spatial coherence and light intensity of the output laser light emitted by the random laser excitation device by changing the voltage applied to the random laser sample 8.

[0043] In this embodiment, only two different voltages, namely, a first voltage and a second voltage, are applied to the random laser sample 8 through the DC power supply 7; and the voltage value of the first voltage is less than the voltage value of the second voltage. When the DC power supply 7 applies the first voltage to the random laser sample 8, the nematic liquid crystal molecules in the random laser sample 8 are arranged according to a preset orientation; when the DC power supply 7 applies the second voltage to the random laser sample 8, the arrangement direction of the nematic liquid crystal molecules is perpendicular to the orientation arrangement direction, thereby changing the refractive index of the nematic liquid crystal molecules, thereby controlling the spatial coherence and light intensity of the emitted laser.

[0044] Among them, the DC power supply 7 energizes the two ITO conductive glasses on the random laser sample 8, so as to form an electric field perpendicular to the preset orientation arrangement direction of the nematic liquid crystal molecules, and changes the orientation of the nematic liquid crystal molecules by changing the magnitude of the applied voltage; and when the DC power supply 7 applies a saturation voltage to the random laser sample 8, the orientation of the nematic liquid crystal molecules is exactly perpendicular to the preset orientation.

[0045] Reference Figure 1 The spatial coherence observation device includes a first convex lens 9, a filter 10, a second beam splitter 11, a fiber spectrometer 12, a second convex lens 13, a double-slit grating 14, a third convex lens 15 and a CCD camera 16 which are sequentially arranged along the optical path; the output laser emitted by the random laser excitation device passes through the first convex lens 9, the filter 10 and the second beam splitter 11 in sequence, and is divided into two beams of light, one beam of light enters the fiber spectrometer 12 to record the spectrum of the output laser, and the other beam of light passes through the second convex lens 13, the double-slit grating 14 and the third convex lens 15 in sequence, and the interference fringes generated are recorded and saved by the CCD camera.

[0046] In this embodiment, the spatial coherence analysis system is a computer configured to analyze the visibility of interference fringes, and is used to perform visibility analysis on the interference fringes saved by the CCD camera, so as to decrypt the encrypted information; at the same time, the spatial coherence analysis system also receives the spectrum recorded by the fiber optic spectrometer 12 and saves it.

[0047] 2(b), 3(a) and 3(b), when the random laser sample 8 is subjected to different voltages, the refractive index of the nematic liquid crystal molecules inside it changes, causing the color of the random laser sample 8 itself to change to a certain extent; at the same time, the spatial coherence and light intensity of the output laser emitted by the random laser excitation device change, and different output lasers will produce interference fringes of different intensities after passing through the double-slit grating 14, and based on the difference in the interference fringes, the encrypted information can be laser encrypted.

[0048] Based on the device described above, its usage is as follows:

[0049] Step 1: Install a DC power supply on the random laser sample 8, and turn on the energy meter 5, the fiber spectrometer 12 and the CCD camera 16.

[0050] Step 2: After the laser pulse emitted by the pulse laser 1 passes through the half-wave plate 2, the polarizer 3, the first beam splitter 4 and the cylindrical lens 6, the laser is irradiated on the random laser sample 8 to excite it, and the energy is recorded by the energy meter 5.

[0051] Step 3: The output laser from the random laser excitation device passes through the first convex lens 9, the filter 10, the second beam splitter 11 and the second convex lens 13, and then irradiates the double-slit grating 14. The transmitted interference fringes are converged by the third convex lens 15 and recorded on the CCD camera 16. At the same time, the spectrum of the output laser from the random laser excitation device is recorded at any time through the optical fiber spectrometer 12.

[0052] Step 4: Convert the information to be encrypted into binary code based on binary coding, and represent it with a combination of numbers 0 and 1; according to the DC power supply voltage application method and the binary code after the encrypted information is converted, control the DC power supply 7 to apply a voltage value to the random laser sample 8, thereby changing the spatial coherence and light intensity of the output laser emitted by the random laser excitation device, and outputting the output laser corresponding to the binary code.

[0053] Step 5: The interference fringes generated by the outgoing laser passing through the double-slit grating 14 are recorded by the CCD camera 16, and the spectrum of the outgoing laser emitted by the random laser excitation device is recorded at any time by the fiber spectrometer 12. The interference fringes and spectrum are transmitted to the spatial coherence analysis system in real time, and the visibility analysis of the interference fringes is performed to obtain encrypted information.

[0054] Referring to Figure 3(c), the DC power supply voltage application method mentioned therein is that when the number in the binary code is 0, the DC power supply 7 applies a first voltage to the random laser sample 8, and the spatial coherence of the emitted laser is defined as "0" at this time; when the number in the binary code is 1, the DC power supply 7 applies a second voltage to the random laser sample 8, and the spatial coherence of the emitted laser is defined as "1" at this time.

[0055] After receiving the interference fringes transmitted by the CCD camera 16, the spatial coherence analysis system analyzes the visibility of the interference fringes to obtain the visibility of each interference fringes; and according to the visibility analysis of the interference fringes, the visibility corresponding to the interference fringes can be obtained, and the spatial coherence of the corresponding emitted laser can be obtained based on the visibility, and the voltage value applied to the random laser sample 8 can be obtained, and the number in the corresponding binary code can be obtained based on the voltage value, thereby obtaining a set of binary codes. After obtaining a set of numbers, they are decoded through binary coding to obtain the final encrypted information.

[0056] Among them, the binary code uses ASCII code.

[0057] In order to facilitate the understanding of the above method, the following description is given:

[0058] As shown in FIG. 3( c ), the first voltage is defined as 0V, the second voltage is defined as 20V (saturation voltage), the information to be encrypted is “SDNU”, and the letter “S” is used for example description.

[0059] Reference Figure 1 and Figure 4 First, the letter "S" is encoded by the ASCII code in the binary code, thereby obtaining the binary code of "01010011". Among them, the 0 in the binary code represents that the DC power supply 7 applies a 0V voltage to the random laser sample 8, and the 1 in the binary code represents that the DC power supply 7 applies a 20V voltage to the random laser sample 8; and the 20V voltage can be considered as the saturation voltage applied to the random laser sample 8.

[0060] Reference Figure 4 In the above manner, the DC power supply 7 is used to apply voltages of "0V, 20V, 0V, 20V, 0V, 0V, 20V, 20V" to the random laser sample 8 in sequence according to the binary code "01010011" (each time the voltage is applied, there will be a duration, and the duration is greater than the time for the orientation of the nematic liquid crystal molecules inside the random laser sample 8 to change; and there is an interval time in the process of applying the voltage twice; wherein the duration can be set to 5s, and the interval time is set to 2s). Afterwards, the random laser excitation device sequentially emits 8 outgoing lasers corresponding to the binary code "01010011"; and after the outgoing laser passes through the spatial coherence observation device, the generated interference fringes are transmitted to the CCD camera 16 for storage; and finally transmitted to the spatial coherence analysis system.

[0061] Referring to Figure 3(c), due to the difference in spatial coherence and light intensity in each emitted laser, the visibility of the interference fringes will be different; after analysis and comparison, the binary code "01010011" can be obtained in the spatial coherence analysis system, and then according to the ASCII encoding, the letter "S" can be obtained. In the same way, the encryption, transmission and decryption of the entire encrypted information "SDNU" are completed.

[0062] Among them, the ASCII encoding uses 8-bit numbers as the code for a single character; the selection of binary encoding can be adaptively adjusted and decoded according to the corresponding decoding method, which is not required here.

[0063] In the above manner, the encryption of the encrypted information can be achieved by changing the spatial coherence and light intensity of the laser, making the entire encryption process relatively simple while ensuring the security of the encryption. In addition, in this embodiment, the optical fiber spectrometer 12 records the spectrum of the emitted laser. By adding a spectrum analysis system to the spatial coherence analysis system and combining it with the original visibility analysis system, encryption can be performed together by combining parameters such as the laser phase, focal length and wavelength, thereby improving the security of the encryption.

[0064] Embodiment 2

[0065] Based on Example 1, refer to Figure 5 , multiple random laser samples 8 can be arranged in an array, and by setting a beam splitter, a lens and a suitable moving device, the laser can be irradiated on each random laser sample 8 in turn; at the same time, multiple DC power supplies 7 can be used to supply power to each random laser sample 8 individually.

[0066] During use, each random laser sample 8 is adjusted to a corresponding state in advance through a power supply, and when the laser is irradiated, the laser can be emitted immediately, thereby further improving the encrypted transmission efficiency.

[0067] At the same time, the binary code of a single character can be represented by a random laser sample 8 in a row or column of the array arrangement; and when a single random laser sample 8 fails, it can be replaced by other random laser samples 8, ensuring that the entire encryption and transmission process can be completed smoothly.

[0068] In addition, it is also possible to irradiate two or more random laser samples 8 with laser light through a beam splitter, a lens and a suitable moving device, and perform encoding through the superimposed emitted laser light.

[0069] As for the arrangement of the random laser samples 8 and the selection of random laser samples 8 for encoding, adaptive adjustments can be made, and no excessive requirements are made here.

[0070] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A random laser coherence dynamic information encryption device, characterized in that: It includes a random laser excitation device, a DC power supply, a spatial coherence observation device, and a spatial coherence analysis system; The random laser excitation device includes a random laser sample, and the random laser excitation device excites the random laser sample by irradiating laser light on the random laser sample; The DC power supply is used to change the spatial coherence and light intensity of the emitted laser light emitted by the random laser excitation device by changing the voltage applied to the random laser sample; The spatial coherence observation device is used to observe and record the spatial coherence and light intensity of the outgoing laser light according to the interference fringes generated by the outgoing laser light emitted by the random laser excitation device after passing through the double-slit grating; The spatial coherence analysis system is used to receive the interference fringes observed and recorded by the spatial coherence observation device and perform visibility analysis.

2. A random laser coherence dynamic information encryption device as claimed in claim 1, characterized in that: The random laser excitation device comprises a pulse laser, a half-wave plate, a polarizer, a first beam splitter, an energy meter, a cylindrical lens and a random laser sample which are sequentially arranged along an optical path. After the laser pulse emitted by the pulse laser passes through the half-wave plate, the polarizer and the first beam splitter in sequence, one beam of light enters the energy meter to record the energy, and the other beam of light passes through the cylindrical lens and is irradiated on the random laser sample to excite it.

3. A random laser coherence dynamic information encryption device as claimed in claim 2, characterized in that: The random laser sample is prepared by two pieces of ITO conductive glass with antiparallel friction orientation, which are filled with a solution; the solution is firstly formed by mixing nematic liquid crystal and DCM dye in a mass ratio of 99.5%:0.5% to form a liquid crystal and DCM solution, and then uniformly mixed with a gold nano solution in a volume ratio of 8:

1.

4. A random laser coherence dynamic information encryption device as claimed in claim 1, characterized in that: The DC power supply is used to apply two different voltages to the random laser sample, which are a first voltage and a second voltage; the voltage value of the first voltage is smaller than the voltage value of the second voltage.

5. A random laser coherence dynamic information encryption device as claimed in claim 4, characterized in that: When the DC power supply applies a first voltage to the random laser sample, the nematic liquid crystal molecules in the random laser sample are arranged according to a preset orientation; when the DC power supply applies a second voltage to the random laser sample, the arrangement direction of the nematic liquid crystal molecules is perpendicular to the orientation arrangement direction, thereby changing the refractive index of the nematic liquid crystal molecules and controlling the spatial coherence and light intensity of the emitted laser.

6. A random laser coherence dynamic information encryption device as claimed in claim 1, characterized in that: The spatial coherence observation device comprises a first convex lens, a filter, a second beam splitter, a fiber spectrometer, a second convex lens, a double-slit grating, a third convex lens and a CCD camera which are sequentially arranged along the optical path. After the output laser emitted by the random laser excitation device passes through the first convex lens, the filter and the second beam splitter in sequence, one beam of light enters the fiber spectrometer to record the spectrum of the output laser, and after the other beam of light passes through the second convex lens, the double-slit grating and the third convex lens in sequence, the interference fringes generated are recorded and stored by the CCD camera.

7. A method for using a random laser coherence dynamic information encryption device based on a random laser coherence dynamic information encryption device as claimed in any one of claims 1 to 6, characterized in that: include: Install the DC power supply on the random laser sample and turn on the energy meter, fiber spectrometer, and CCD camera; The laser pulse emitted by the pulse laser passes through a half-wave plate, a polarizer, a first beam splitter and a cylindrical lens, and then irradiates the pump light onto a random laser sample to excite it, and the energy is recorded by an energy meter; The output laser emitted by the random laser excitation device passes through the first convex lens, the filter, the second beam splitter and the second convex lens, and then irradiates the double-slit grating. The transmitted interference fringes are converged by the third convex lens and recorded on the CCD camera. At the same time, the spectrum of the output laser emitted by the random laser is recorded at any time by the fiber optic spectrometer. Based on binary coding, the information to be encrypted is converted into binary code and represented by a combination of numbers 0 and 1; according to the DC power supply voltage application method and the binary code after the encrypted information is converted, the DC power supply is controlled to apply a voltage value to the random laser sample, thereby changing the spatial coherence and light intensity of the output laser emitted by the random laser excitation device, and outputting the output laser corresponding to the binary code; The interference fringes generated by the laser passing through the double-slit grating are recorded by a CCD camera, and the spectrum of the output laser emitted by the random laser is recorded at any time by a fiber optic spectrometer. The interference fringes and spectrum are transmitted to the spatial coherence analysis system in real time, and the visibility of the interference fringes is analyzed to obtain encrypted information.

8. The method for using a random laser coherence dynamic information encryption device as claimed in claim 7, characterized in that: The DC power supply voltage application method is specifically as follows: when the number in the binary code is 0, the DC power supply applies a first voltage to the random laser sample, and the spatial coherence of the emitted laser is defined as "0" at this time; when the number in the binary code is 1, the DC power supply applies a second voltage to the random laser sample, and the spatial coherence of the emitted laser is defined as "1" at this time.

9. The method for using a random laser coherence dynamic information encryption device as claimed in claim 7, characterized in that: The encrypted information is obtained specifically by analyzing the visibility of the interference fringes to obtain the binary code corresponding to the spatial coherence in the interference fringes, and then obtaining the encrypted information based on the binary code.

10. The method for using a random laser coherence dynamic information encryption device as claimed in claim 7, characterized in that: The binary code is specifically ASCII code.

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