Multi-inclined mirror quantum communication device and interaction method

Abstract

The application provides a kind of multi-inclined mirror quantum communication device and interactive method, comprising: first voice coil tilting mirror, first beam splitter, first condenser lens, first precision tracking detector, second voice coil tilting mirror, reflector, second beam splitter, second condenser lens and second precision tracking detector;First voice coil tilting mirror receives incoming light to generate low frequency correction light;First beam splitter divides low frequency correction light into first split beam and second split beam;First condenser lens focuses first split beam to first precision tracking detector, so that it calculates the error of first split beam and transmits the error of first split beam to processor.Second voice coil tilting mirror converts second split beam into high frequency correction light;Second beam splitter receives high frequency correction light through reflector, and is divided into third split beam and fourth split beam;Second condenser lens focuses third split beam to second precision tracking detector, so that it calculates the error of third split beam and transmits the error of third split beam to processor, and fourth split beam is used as outgoing light to propagate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quantum communication, and in particular to a multi-inclined mirror quantum communication device and interaction method. BACKGROUND

[0002] Quantum communication is a new type of communication mode for information transmission by using quantum superposition state and entanglement effect, and provides absolute security guarantee that cannot be eavesdropped and cracked by calculation based on three principles of uncertainty, measurement collapse and non-cloning in quantum mechanics. It is divided into quantum teleportation and quantum key distribution. Quantum key distribution, also known as quantum cryptography, is to realize secure quantum key sharing between communication parties by means of transmission and measurement of quantum superposition state, and then to realize unconditional and absolute secure communication by using the same length of password as plaintext for bit-by-bit encryption and decryption operation through a symmetric encryption system.

[0003] When photons propagate in free space, complex error frequency and wavefront tilt of quantum communication are caused due to atmospheric turbulence and other factors. The tilt mirror is a reflector driven by a voice coil motor driver with a resolution reaching micron level, which can cause rapid and small-angle tilt change of photon transmission, and thus improve the quality of quantum communication.

[0004] The current commonly used implementation scheme mainly adopts a single tilt mirror to realize high-precision stable tracking of the system to reduce system jitter error. Due to extremely weak quantum signal light and light intensity loss of space link, a large aperture optical telescope system is needed for ultra-long distance space quantum communication, and the quantum signal light divergence angle needs to be controlled close to the diffraction limit. The beam alignment accuracy needs to reach the micro-radian level to ensure the stability of the communication link. SUMMARY

[0005] Therefore, it is necessary to provide a multi-inclined mirror quantum communication device and interaction method aiming at the above technical problems.

[0006] A multi-inclined mirror quantum communication device comprises a first voice coil tilt mirror, a first beam splitter, a first condenser lens, a first fine tracking detector, a second voice coil tilt mirror, a reflector, a second beam splitter, a second condenser lens and a second fine tracking detector.

[0007] The first voice coil tilt mirror is arranged on the propagation route of incident light, and is used to eliminate low-frequency jitter error and generate low-frequency correction light.

[0008] The first beam splitter is arranged on the propagation route of the low-frequency correction light, and divides the low-frequency correction light into a first split beam and a second split beam.

[0009] The first focusing lens is arranged on a propagation path of the first split beam, and focuses the first split beam to the first fine tracking detector.

[0010] The first fine tracking detector calculates an error of the first split beam and transmits a calculation result to a processor, so that the processor controls the first voice coil tilting mirror to adjust a tilting angle.

[0011] The second voice coil tilting mirror is arranged on a propagation path of the second split beam, and is used to eliminate a high-frequency jitter error to generate high-frequency correction light.

[0012] The reflecting mirror is arranged on a propagation path of the high-frequency correction light, and propagates the high-frequency correction light to the second beam splitter.

[0013] The second beam splitter divides the high-frequency correction light into a third split beam and a fourth split beam.

[0014] The second focusing lens is arranged on a propagation path of the third split beam, and focuses the third split beam to the second fine tracking detector.

[0015] The second fine tracking detector calculates an error of the third split beam and transmits a calculation result to a processor, so that the processor controls the second voice coil tilting mirror to adjust a tilting angle.

[0016] The fourth split beam propagates as outgoing light.

[0017] In one of the embodiments, the system further comprises:

[0018] The first voice coil tilting mirror is a large-stroke low-precision voice coil motor tilting mirror.

[0019] In one of the embodiments, the first fine tracking detector calculating the error of the current first split beam comprises:

[0020] The first split beam enters the first fine tracking detector, and a first light spot signal is formed on the first fine tracking detector.

[0021] The first fine tracking detector converts the first light spot signal into a current signal distributed on the first fine tracking detector, converts the current signal into a digital second light spot signal through A / D conversion, and calculates a second light spot energy signal according to the second light spot signal.

[0022] An angle difference of the second light spot energy signal on the x and y planes is obtained, and a deviation between the angle difference and an expected angle is calculated to obtain the error of the current first split beam.

[0023] e1 Δθx = r1 x - Δθ1 x

[0024] e1 Δθy = r1 y - Δθ1 y

[0025] wherein e1 Δθx represents the error of the first beamlet in the x plane, r1 x represents the expected angle of the second spot energy signal in the x plane, Δθ1 x represents the angle difference of the second spot energy signal in the x plane, e1 Δθy represents the error of the first beamlet in the y plane, r1 y represents the expected angle of the second spot energy signal in the y plane, Δθ1 y represents the angle difference of the second spot energy signal in the y plane.

[0026] In one embodiment, the application further comprises:

[0027] The second voice coil tilting mirror is a small-stroke high-precision tilting mirror.

[0028] In one embodiment, the second fine tracking detector calculates the error of the current third beamlet, comprising:

[0029] The third beamlet enters the second fine tracking detector, and a third spot signal is formed on the second fine tracking detector;

[0030] The second fine tracking detector converts the third spot signal into a current signal distributed on the second fine tracking detector, converts the current signal into a digital fourth spot signal through A / D conversion, and calculates a fourth spot energy signal according to the fourth spot signal;

[0031] The angle difference of the fourth spot energy signal in the x and y planes is obtained, and the error of the current third beamlet is obtained by calculating the deviation between the angle difference and the expected angle:

[0032] e2 Δθx = r2 x - Δθ2 x

[0033] e2 Δθy = r2 y - Δθ2 y

[0034] wherein e2 Δθx represents the error of the third beamlet in the x plane, r2 x represents the expected angle of the fourth spot energy signal in the x plane, Δθ2 x represents the angle difference of the fourth spot energy signal in the x plane, e2 Δθyrepresents the error of the third beam in the y plane, r2 y represents the expected angle of the fourth spot energy signal in the y plane, Delta theta 2 y represents the angle difference of the fourth spot energy signal in the y plane of the first beam.

[0035] A multi-inclined mirror quantum communication interaction method, for a multi-inclined mirror quantum communication device as described above, comprising:

[0036] The first voice coil inclined mirror is arranged on the propagation route of the incident light, for eliminating low-frequency jitter error and generating low-frequency correction light;

[0037] The first beam splitter is arranged on the propagation route of the low-frequency correction light, for splitting the low-frequency correction light into a first beam and a second beam;

[0038] The first focusing lens is arranged on the propagation route of the first beam, for focusing the first beam to a first fine tracking detector;

[0039] The first fine tracking detector calculates the error of the first beam and transmits the calculation result to a processor, so that the processor controls the first voice coil inclined mirror to adjust the inclination angle;

[0040] The second voice coil inclined mirror is arranged on the propagation route of the second beam, for eliminating high-frequency jitter error and generating high-frequency correction light;

[0041] The mirror is arranged on the propagation route of the high-frequency correction light, for propagating the high-frequency correction light to a second beam splitter;

[0042] The second beam splitter splits the high-frequency correction light into a third beam and a fourth beam;

[0043] The second focusing lens is arranged on the propagation route of the third beam, for focusing the third beam to a second fine tracking detector;

[0044] The second fine tracking detector calculates the error of the third beam and transmits the calculation result to a processor, so that the processor controls the second voice coil inclined mirror to adjust the inclination angle;

[0045] The fourth beam propagates as the outgoing light.

[0046] Compared with the prior art, the application has the advantages and beneficial effects that the application can greatly improve the bandwidth, stability and accuracy of quantum communication by optimizing the correction bandwidth and dynamic range while considering the correction bandwidth and dynamic range.

[0047] This method is easy to implement and has more adjustable variables, which has a great driving effect on the development of related fields mediated by light propagation. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 A structure schematic diagram of a multi-inclined mirror quantum communication device in an embodiment;

[0049] Figure 2 A process schematic diagram in which a processor controls the first voice coil inclined mirror and the second voice coil inclined mirror to adjust the tilt angle in an embodiment. DETAILED DESCRIPTION

[0050] Before the specific embodiment of the present application is described, the overall concept of the present application is described as follows:

[0051] With the development of technology, quantum communication is becoming more and more mature, and how to ensure that the carrier photons of quantum communication do not lose energy and deviate from the propagation path during propagation is increasingly valued by the industry, and the requirement for its accuracy is increasingly high.

[0052] The existing single inclined mirror can effectively improve the accuracy, and various filtering technologies for the resonance phenomenon of the inclined mirror further improve the accuracy, but the filtering technology cannot simultaneously optimize the correction bandwidth and the dynamic range, and only one of the two can be selected.

[0053] At present, the inclined mirror has an inherent elastic structure, but when the frequency of the control signal is too high, the mirror surface of the reflecting mirror will have a mechanical resonance phenomenon, which will seriously affect the stability of the control system and limit the control bandwidth. Although the resonance phenomenon can be greatly suppressed by filtering technology, in a single inclined mirror, the filtering technology can only correct the bandwidth and the dynamic range, and only one of the two can be selected for extreme improvement, and the correction bandwidth and the dynamic range cannot be satisfied at the same time.

[0054] Therefore, the present application provides a multi-inclined mirror quantum communication interaction method, which realizes high and low frequency separation by using two voice coil inclined mirrors to control the double inclined mirrors, so that the large-stroke low-frequency inclined mirror is used to correct the low-frequency error, and the small-stroke high-frequency inclined mirror is used to correct the high-frequency error. In this way, compared with a single inclined mirror, the correction performance and the dynamic range will be optimal.

[0055] After introducing the overall concept of the present application, in order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described in detail through specific embodiments combined with the drawings.

[0056] It should be noted that the technical terms or scientific terms used in the one or more embodiments of the present application should be understood as the general meaning understood by the person skilled in the art in the field to which the present application belongs, unless otherwise defined. The terms "first", "second", and the like used in the one or more embodiments of the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship can also change accordingly.

[0057] In one embodiment, as shown in Figure 1 A schematic diagram of a multi-inclined mirror quantum communication device structure is provided, including: a first voice coil inclined mirror 1, a first beam splitter 2, a first focusing lens 3, a first fine tracking detector 4, a second voice coil inclined mirror 5, a reflecting mirror 6, a second beam splitter 7, a second focusing lens 8, and a second fine tracking detector 9.

[0058] The first voice coil inclined mirror 1 is arranged on the propagation path of the incident light, and is used to eliminate low-frequency jitter error and generate low-frequency correction light. Specifically, the first voice coil inclined mirror 1 is a large-stroke low-precision voice coil motor inclined mirror, which is responsible for eliminating the low-frequency jitter error of the system.

[0059] The first beam splitter 2 is arranged on the propagation path of the low-frequency correction light, and divides the low-frequency correction light into a first beam and a second beam.

[0060] The first focusing lens 3 is arranged on the propagation path of the first beam, and focuses the first beam to the first fine tracking detector 4.

[0061] The first fine tracking detector 4 calculates the error of the first beam and transmits the error of the first beam to the processor, so that the processor controls the first voice coil inclined mirror 1 to adjust the inclination angle.

[0062] When the incident light enters the system along the light path, it passes through the first voice coil inclined mirror 1 and the first beam splitter 2 in turn. At this time, the first beam splitter 2 reflects a small part of the light (the first beam) through the first focusing lens 3 into the first fine tracking detector 4, while transmitting most of the light (the second beam) into the second voice coil inclined mirror 5.

[0063] The first split beam enters the first fine tracking detector 4, and a first light spot signal is formed on the first fine tracking detector 4. The first fine tracking detector 4 converts the first light spot signal into a current signal distributed on the first fine tracking detector 4, and converts the current signal into a digital second light spot signal through A / D conversion. The second light spot energy signal is calculated according to the second light spot signal. The angle difference of the second light spot energy signal in the x and y planes is obtained, and the deviation between the angle difference and the expected angle is obtained to obtain the error of the current first split beam:

[0064] e1 Δθx =r1 x -Δθ1 x

[0065] e1 Δθy =r1 y -Δθ1 y

[0066] wherein e1 Δθx represents the error of the first split beam in the x plane, r1 x represents the expected angle of the second light spot energy signal in the x plane, Δθ1 x represents the angle difference of the second light spot energy signal in the x plane, e1 Δθy represents the error of the first split beam in the y plane, r1 y represents the expected angle of the second light spot energy signal in the y plane, Δθ1 y represents the angle difference of the second light spot energy signal in the y plane.

[0067] The first fine tracking detector 4 calculates the error e1 Δθx of the first split beam from the calibration position according to the obtained light spot energy, and e1 Δθy is transmitted to the processor. The processor controls the first voice coil tilting mirror 1 to adjust to the appropriate position by using the PID control algorithm, so that the light spot position of the first fine tracking detector 4 approaches the calibration position. Since the first voice coil tilting mirror 1 is a large-stroke low-precision voice coil motor tilting mirror, only part of the low-frequency error can be corrected at this time.

[0068] The second voice coil tilting mirror 5 is arranged on the propagation path of the second split beam, and is used to eliminate high-frequency jitter error and generate high-frequency correction light.

[0069] The mirror 6 is arranged on the propagation path of the high-frequency correction light, and transmits the high-frequency correction light to the second beam splitter 7. The second beam splitter 7 divides the high-frequency correction light into a third split beam and a fourth split beam. The first beam splitter 2 and the second beam splitter 7 are both half-reflective half-transmissive lens pieces

[0070] The second condenser lens 8 is arranged on the propagation path of the third split beam, and focuses the third split beam to the second fine tracking detector 9.

[0071] The second fine tracking detector 9 calculates the error of the third beam and transmits the error of the third beam to the processor to control the second audio coil tilting mirror 5 to adjust the tilting angle.

[0072] The third beam enters the second fine tracking detector 9, and a third light spot signal is formed on the second fine tracking detector 9. The second fine tracking detector 9 converts the third light spot signal into a current signal distributed on the second fine tracking detector 9, and the current signal is converted into a digital fourth light spot signal through A / D conversion. The fourth light spot energy signal is calculated according to the fourth light spot signal. The angle difference of the fourth light spot energy signal in the x and y planes is obtained, and the deviation between the angle difference and the expected angle is obtained to obtain the error of the current third beam:

[0073] e2 Δθx =r2 x -Δθ2 x

[0074] e2 Δθy =r2 y -Δθ2 y

[0075] Wherein, e2 Δθx represents the error of the third beam in the x plane, r2 x represents the expected angle of the fourth light spot energy signal in the x plane, Δθ2 x represents the angle difference of the fourth light spot energy signal in the x plane, e2 Δθy represents the error of the third beam in the y plane, r2 y represents the expected angle of the fourth light spot energy signal in the y plane, Δθ2 y represents the angle difference of the fourth light spot energy signal in the y plane.

[0076] When the low-frequency tilting correction of the previous stage is completed, the imaging jitter error in the second fine tracking detector 9 at this time is mainly high-frequency error. Similarly, the tracking error e2 Δθx and e2 Δθy are transmitted to the processor, and the processor controls the second audio coil tilting mirror 5 to adjust to the appropriate position by using the PID control algorithm, so that the light spot position of the second fine tracking detector 9 approaches the calibration position. The specific process of the processor controlling the first audio coil tilting mirror 1 and the second audio coil tilting mirror 5 to adjust the tilting angle is shown in Figure 2 .

[0077] Finally, the fourth beam is propagated as the outgoing light.

[0078] The present application can greatly improve the bandwidth, stability and accuracy of quantum communication by simultaneously optimizing the correction bandwidth and dynamic range of the double tilting mirror.

[0079] The method is easy to implement, has more adjustable variables, and has a great driving effect on the development of related fields using light propagation as a medium.

[0080] It should be noted that some embodiments of the application have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than those described above and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0081] Based on the same inventive concept, the application also provides a multi-inclined mirror quantum communication interaction method corresponding to any of the above-mentioned embodiments.

[0082] A multi-inclined mirror quantum communication interaction method comprises:

[0083] A first voice coil tilting mirror 1 is arranged on the propagation path of incident light, used to eliminate low-frequency jitter error and generate low-frequency correction light;

[0084] A first beam splitter 2 is arranged on the propagation path of the low-frequency correction light, and the low-frequency correction light is divided into a first split beam and a second split beam;

[0085] A first focusing lens 3 is arranged on the propagation path of the first split beam, and the first split beam is focused on a first fine tracking detector 4;

[0086] The first fine tracking detector 4 calculates the error of the first split beam and transmits the calculation result to a processor, so that the processor controls the first voice coil tilting mirror 1 to adjust the tilt angle;

[0087] A second voice coil tilting mirror 5 is arranged on the propagation path of the second split beam, used to eliminate high-frequency jitter error and generate high-frequency correction light;

[0088] A mirror 6 is arranged on the propagation path of the high-frequency correction light, and the high-frequency correction light is propagated to a second beam splitter 7;

[0089] The second beam splitter 7 divides the high-frequency correction light into a third split beam and a fourth split beam;

[0090] A second focusing lens 8 is arranged on the propagation path of the third split beam, and the third split beam is focused on a second fine tracking detector 9;

[0091] The second fine tracking detector 9 calculates the error of the third split beam and transmits the calculation result to the processor, so that the processor controls the second voice coil tilting mirror 5 to adjust the tilting angle;

[0092] The fourth split beam propagates as outgoing light.

[0093] The method of the above embodiment is used in a multi-tilting mirror quantum communication device of any one of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described here.

[0094] It should be understood by those of ordinary skill in the art that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application (including claims) is limited to these examples; under the idea of the present application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in details.

[0095] Having described specific details of exemplary embodiments of the present application to describe the present application, it is obvious to those skilled in the art that the present application can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered as illustrative rather than limiting. Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0096] The embodiments of the present application are intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A multi-tilted mirror quantum communication device, characterized in that, include: First voice coil tilting mirror, first beam splitter, first condenser lens, first fine tracking detector, second voice coil tilting mirror, reflector, second beam splitter, second condenser lens, and second fine tracking detector; The first voice coil tilt mirror is positioned in the propagation path of the incident light to eliminate low-frequency jitter error and generate low-frequency correction light; The first beam splitter is positioned on the propagation path of the low-frequency corrected light, dividing the low-frequency corrected light into a first beam and a second beam. The first focusing lens is disposed on the propagation path of the first beam splitter, focusing the first beam splitter onto the first fine tracking detector; The first precision tracking detector calculates the error of the first beam splitter and transmits the error of the first beam splitter to the processor, so that the processor controls the first voice coil tilt mirror to adjust the tilt angle; The second voice coil tilt mirror is positioned on the propagation path of the second beam splitter to eliminate high-frequency jitter errors and generate high-frequency corrected light; The reflector is positioned in the propagation path of the high-frequency corrected light, and propagates the high-frequency corrected light to the second beam splitter; The second beam splitter divides the high-frequency corrected light into a third beam and a fourth beam; The second focusing lens is disposed on the propagation path of the third beam and focuses the third beam onto the second precision tracking detector; The second precision tracking detector calculates the error of the third beam and transmits the error of the third beam to the processor, so that the processor controls the second voice coil tilt mirror to adjust the tilt angle; The fourth beam is transmitted as outgoing light.

2. The multi-tilted mirror quantum communication device according to claim 1, characterized in that, Also includes: The first voice coil tilt mirror is a large-stroke, low-precision voice coil motor tilt mirror.

3. The multi-tilted mirror quantum communication device according to claim 1, characterized in that, The error of the first fine-tracking detector in calculating the current first beam split includes: The first beam enters the first fine tracking detector, forming a first spot signal on the first fine tracking detector; The first precision tracking detector converts the first spot signal into a current signal distributed on the first precision tracking detector, converts it into a digital second spot signal via an A / D converter, and calculates the second spot energy signal based on the second spot signal; Obtain the angular difference between the energy signal of the second light spot in the x and y planes, calculate the deviation between the angular difference and the desired angle, and obtain the error of the current first beam split: e1 Δθx =r1 x -Δθ1 x e1 Δθy =r1 y -Δθ1 y Among them, e1 Δθx r1 represents the error of the first beam in the x-plane. x Δθ1 represents the desired angle of the second light spot energy signal on the x-plane. x e1 represents the angular difference in the energy signal of the second light spot on the x-plane. Δθy r1 represents the error of the first beam in the y-plane. y Δθ1 represents the desired angle of the second light spot energy signal in the y-plane. y This represents the angular difference between the energy signal of the second light spot and the first beam split in the y-plane.

4. The multi-tilted mirror quantum communication device according to claim 1, characterized in that, Also includes: The second voice coil tilting mirror is a short-stroke, high-precision tilting mirror.

5. The multi-tilted mirror quantum communication device according to claim 1, characterized in that, The second precision tracking detector calculates the error of the current third beam splitting as follows: The third beam enters the second fine tracking detector, forming a third spot signal on the second fine tracking detector; The second fine tracking detector converts the third spot signal into a current signal distributed on the second fine tracking detector, converts it into a digital fourth spot signal via an A / D converter, and calculates the fourth spot energy signal based on the fourth spot signal. Obtain the angular difference between the energy signal of the fourth beam spot and the x-y plane, calculate the deviation between the angular difference and the desired angle, and obtain the error of the current third beam split: e2 Δθx =r2 x -Δθ2 x e2 Δθy =r2 y -Δθ2 y Among them, e2 Δθx r2 represents the error of the third beam in the x-plane. x Δθ2 represents the expected angle of the fourth light spot energy signal in the x-plane. x e2 represents the angular difference in the energy signal of the fourth light spot on the x-plane. Δθy r2 represents the error of the third beam in the y-plane. y Δθ2 represents the desired angle of the fourth light spot energy signal in the y-plane. y This represents the angular difference between the energy signal of the fourth spot and the first beam split in the y-plane.

6. A multi-tilted mirror quantum communication interaction method, characterized in that, A multi-tilt mirror quantum communication device as described in any one of claims 1-4, comprising: The first voice coil tilting mirror is placed in the propagation path of the incident light to eliminate low-frequency jitter error and generate low-frequency corrected light; The first beam splitter is positioned on the propagation path of the low-frequency corrected light, dividing the low-frequency corrected light into a first beam and a second beam. The first focusing lens is disposed on the propagation path of the first beam splitter, focusing the first beam splitter onto the first fine tracking detector; The first precision tracking detector calculates the error of the first beam splitter and transmits the calculation result to the processor, so that the processor controls the first voice coil tilt mirror to adjust the tilt angle. The second voice coil tilt mirror is placed on the propagation path of the second beam splitter to eliminate high-frequency jitter error and generate high-frequency corrected light; A reflector is positioned in the propagation path of the high-frequency corrected light to propagate the high-frequency corrected light to the second beam splitter; The second beam splitter divides the high-frequency corrected light into a third beam and a fourth beam; The second focusing lens is positioned on the propagation path of the third beam to focus the third beam onto the second fine tracking detector; The second precision tracking detector calculates the error of the third beam splitter and transmits the calculation result to the processor, so that the processor controls the second voice coil tilt mirror to adjust the tilt angle; The fourth beam is transmitted as outgoing light.

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