Multi-tilting-mirror quantum communication device and interaction method

Abstract

The invention provides a multi-tilting-mirror quantum communication device and an interaction method. The multi-tilting-mirror quantum communication device comprises a first voice coil tilting mirror, a first spectroscope, a first condensing lens, a first fine tracking detector, a second voice coil tilting mirror, a reflector, a second spectroscope, a second condensing lens and a second fine tracking detector. The first voice coil tilting mirror receives incident light to generate low-frequency correction light; the first spectroscope divides the low-frequency correction light into a first split beam and a second split beam; the first condensing lens focuses the first split beam to the first fine tracking detector, so that the first fine tracking detector calculates the error of the first split beam and transmits the error of the first split beam to the processor. The second voice coil tilting mirror converts the second split beam into high-frequency correction light; the second spectroscope receives the high-frequency correction light through a reflector and divides the high-frequency correction light into a third split beam and a fourth split beam; and the second condensing lens focuses the third split beam to a second fine tracking detector, so that the second fine tracking detector calculates the error of the third split beam and transmits the error of the third split beam to the processor, and the fourth split beam is spread as emergent light.

Description

Technical Field

[0001] The present invention relates to the technical field of quantum communication, and in particular to a multi-tilt mirror quantum communication device and an interaction method. Background Art

[0002] Quantum communication is a new type of communication method that uses quantum superposition states and entanglement effects to transmit information. Based on the three principles of uncertainty, measurement collapse, and non-clonability in quantum mechanics, it provides an absolute security guarantee that cannot be wiretapped or computationally cracked. It is divided into two types: quantum teleportation and quantum key distribution. Among them, quantum key distribution, also known as quantum cryptography, realizes the secure sharing of quantum keys between communication parties through the transmission and measurement of quantum superposition states, and then through a one-time pad symmetric encryption system, that is, both communication parties use a password of the same length as the plaintext to perform bit-by-bit encryption and decryption operations to achieve unconditional and absolutely secure confidential communication.

[0003] When photons propagate in free space, due to the influence of atmospheric turbulence and other factors, it will cause complex error frequencies and wavefront tilts in quantum communication. The tilt mirror is a mirror driven by a voice coil motor driver with a resolution reaching the micron level, which can cause rapid and small-angle tilt changes in the transmission of photons, thereby improving the quality of quantum communication.

[0004] Currently, the commonly used implementation scheme mainly uses a single tilt mirror to achieve high-precision stable tracking of the system to reduce system jitter errors. Due to the extremely weak quantum signal light and the optical intensity loss of the space link, etc., ultra-long-distance space quantum communication requires a large-aperture optical telescope system, and at the same time, the divergence angle of the quantum signal light needs to be controlled close to the diffraction limit, and the beam alignment accuracy needs to reach the microarcsecond level to ensure the stability of the communication link. Summary of the Invention

[0005] Based on this, it is necessary to provide a multi-tilt mirror quantum communication device and an interaction method for the above technical problems.

[0006] A multi-tilt mirror quantum communication device includes: 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 path of the incident light for eliminating low-frequency jitter errors and generating low-frequency corrected light;

[0008] The first beam splitter is arranged on the propagation path of the low-frequency corrected light to divide the low-frequency corrected light into a first split beam and a second split beam;

[0009] The first condenser lens is disposed on the propagation path of the first split beam to focus the first split beam onto the first fine tracking detector;

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

[0011] The second voice coil tilt mirror is disposed on the propagation path of the second split beam to eliminate high-frequency jitter error and generate high-frequency correction light;

[0012] The reflector is disposed on the propagation path of the high-frequency correction light to transmit 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 condenser lens is disposed on the propagation path of the third split beam to focus the third split beam onto the second fine tracking detector;

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

[0016] The fourth split beam is propagated as the outgoing light.

[0017] In one embodiment, it further includes:

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

[0019] In one embodiment, the first fine tracking detector calculates the error of the current first split beam including:

[0020] The first split beam enters the first fine tracking detector to form a first spot signal on the first fine tracking detector;

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

[0022] Obtain the angle difference of the second spot energy signal in the x and y planes, and find the deviation between the angle difference and the desired angle 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] Among them, e1 Δθx represents the error of the first split beam in the x-plane, r1 x represents the desired 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 split beam in the y-plane, r1 y represents the desired angle of the second spot energy signal in the y-plane, Δθ1 y represents the angle difference of the second spot energy signal of the first split beam in the y-plane.

[0026] In one of the embodiments, it further includes:

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

[0028] In one of the embodiments, the second fine tracking detector calculates the error of the current third split beam including:

[0029] The third split beam enters the second fine tracking detector and forms a third spot signal 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 it to a digital fourth spot signal through A / D conversion, and calculates the fourth spot energy signal according to the fourth spot signal;

[0031] Obtain the angle difference of the fourth spot energy signal in the x and y planes, and find the deviation between the angle difference and the desired angle to obtain the error of the current third split beam:

[0032] e2 Δθx = r2 x -Δθ2 x

[0033] e2 Δθy = r2 y -Δθ2 y

[0034] Among them, e2 Δθx represents the error of the third split beam in the x-plane, r2 x represents the desired 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 ΔθyIndicates the error of the third split beam in the y-plane, r2 y Indicates the desired angle of the fourth spot energy signal in the y-plane, Δθ2 y Indicates the angular difference between the fourth spot energy signal and the first split beam in the y-plane.

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

[0036] The first voice coil tilt mirror is arranged on the propagation path of the incident light to eliminate low-frequency jitter errors and generate low-frequency corrected light;

[0037] The first beam splitter is arranged on the propagation path of the low-frequency corrected light to divide the low-frequency corrected light into a first split beam and a second split beam;

[0038] The first condenser lens is arranged on the propagation path of the first split beam to focus the first split beam onto the first fine tracking detector;

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

[0040] The second voice coil tilt mirror is arranged on the propagation path of the second split beam to eliminate high-frequency jitter errors and generate high-frequency corrected light;

[0041] The mirror is arranged on the propagation path of the high-frequency corrected light to propagate the high-frequency corrected light to the second beam splitter;

[0042] The second beam splitter divides the high-frequency corrected light into a third split beam and a fourth split beam;

[0043] The second condenser lens is arranged on the propagation path of the third split beam to focus the third split beam onto the second fine tracking detector;

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

[0045] The fourth split beam is propagated as the outgoing light.

[0046] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: By interacting with the double tilt mirror, the present invention simultaneously optimizes the correction bandwidth and the dynamic range, and can greatly improve the bandwidth, stability and accuracy of quantum communication.

[0047] This method has a low implementation difficulty, more adjustable variables, and has a huge promoting effect on the development of related fields with light propagation as the medium. Brief Description of the Drawings

[0048] Figure 1 It is a schematic structural diagram of a multi-tilt mirror quantum communication device in an embodiment;

[0049] Figure 2 It is a schematic diagram of the process in which a processor controls a first voice coil tilt mirror and a second voice coil tilt mirror to adjust the tilt angle in an embodiment. Detailed Description of the Invention

[0050] Before describing the specific embodiments of the present invention, the overall concept of the present invention is described as follows:

[0051] With the development of technology, quantum communication has become more and more mature. How to ensure that photons, the carriers of quantum communication, do not lose energy and do not deviate from the propagation path during propagation has attracted more and more attention in the industry, and the requirements for its accuracy are getting higher and higher.

[0052] For the existing single tilt mirror, although it can effectively improve the accuracy, and with various filtering technologies in the resonance phenomenon of the tilt mirror, the accuracy is further improved. However, the filtering technology has the problem that the correction bandwidth and the dynamic range cannot be optimized simultaneously, and only one of them can be selected.

[0053] At present, tilt mirrors all have an inherent elastic structure. However, when the frequency of the control signal is too high, mechanical resonance will occur on the mirror surface of the mirror, which will seriously affect the stability of the control system and limit the control bandwidth when it is serious. Although the resonance phenomenon can be greatly suppressed by filtering technology, in a single tilt mirror, using filtering technology can only achieve the correction bandwidth and the dynamic range, and only one of them can be extremely improved, and it is impossible to meet both the correction bandwidth and the dynamic range at the same time.

[0054] Therefore, the present invention proposes a multi-tilt mirror quantum communication interaction method. By using two voice coil tilt mirrors to realize the control of dual tilt mirrors with high and low frequency separation, a large-stroke low-frequency tilt mirror is used to correct low-frequency errors, and a small-stroke high-frequency tilt mirror is used to correct high-frequency errors. In this way, compared with a single tilt mirror, its correction performance and dynamic range will reach the optimal.

[0055] After introducing the overall concept of the present invention, in order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the drawings.

[0056] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second" and similar terms used in one or more embodiments of this specification do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

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

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

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

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

[0062] When the incident light enters the system along the optical path, it passes through the first voice coil tilt mirror 1 and the first beam splitter 2 in sequence. At this time, the first beam splitter 2 reflects a small part of the light (the first split beam) through the first condenser lens 3 into the first fine tracking detector 4, and at the same time transmits most of the light (the second split beam) into the second voice coil tilt mirror 5.

[0063] The first split beam enters the first fine tracking detector 4, and a first spot signal is formed on the first fine tracking detector 4. The first fine tracking detector 4 converts the first spot signal into a current signal distributed on the first fine tracking detector 4, which is converted into a digital second spot signal through A / D conversion, and the second spot energy signal is calculated according to the second spot signal. The angular difference of the second spot energy signal in the x and y planes is obtained, and the deviation is calculated between the angular difference and the desired angle 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] Among them, e1 Δθx represents the error of the first split beam in the x plane, r1 x represents the desired angle of the second spot energy signal in the x plane, Δθ1 x represents the angular difference of the second 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 desired angle of the second spot energy signal in the y plane, Δθ1 y represents the angular difference of the second spot energy signal of the first split beam in the y plane.

[0067] The first fine tracking detector 4 calculates the error e1 of the first split beam from the obtained spot energy with the calibrated position Δθx and e1 Δθy After that, it is transmitted into the processor, and the processor uses the PID control algorithm to control the first voice coil tilt mirror 1 to adjust to a suitable position, so that the spot position of the first fine tracking detector 4 approaches the calibrated position. Since the first voice coil tilt mirror 1 is a large-stroke and low-precision voice coil motor tilt mirror, only part of the low-frequency error can be corrected at this time.

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

[0069] The reflector 6 is arranged on the propagation path of the high-frequency correction light to transmit the high-frequency correction light to the second beam splitter 7, and the second beam splitter 7 divides the high-frequency correction light into a third split beam and a fourth split beam. Both the first beam splitter 2 and the second beam splitter 7 are semi-reflective and semi-transmissive lens sheets

[0070] The second condenser lens 8 is arranged on the propagation path of the third split beam to focus the third split beam onto 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, so that the processor controls the second voice coil tilt mirror 5 to adjust the tilt angle.

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

[0073] e2 Δθx =r2 x -Δθ2 x

[0074] e2 Δθy =r2 y -Δθ2 y

[0075] Among them, e2 Δθx represents the error of the third beam splitter in the x-plane, r2 x represents the expected angle of the fourth spot energy signal on the x-plane, Δθ2 x represents the angle difference of the energy signal of the fourth light spot on the x-plane, e2 Δθy represents the error of the third beam splitter in the y plane, r2 y represents the expected angle of the fourth spot energy signal on the y plane, Δθ2 y Represents the angular difference of the fourth light spot energy signal in the first beam on the y plane.

[0076] After the previous low-frequency tilt correction, the imaging jitter error in the second fine tracking detector 9 is mainly a high-frequency error. Similarly, the tracking error e2 in the second fine tracking detector 9 is Δθx and e2 Δθy The data is transmitted to the processor, and the processor uses the PID control algorithm to control the second voice coil tilt mirror 5 to adjust to a suitable position, so that the spot position of the second fine tracking detector 9 is close to the calibration position. The specific process of the processor controlling the first voice coil tilt mirror 1 and the second voice coil tilt mirror 5 to adjust the tilt angle is as follows: Figure 2 shown.

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

[0078] The present invention can greatly improve the bandwidth, stability and accuracy of quantum communication by optimizing the correction bandwidth and dynamic range simultaneously through the dual tilt mirrors.

[0079] This method has a low implementation difficulty and more adjustable variables, which greatly promotes the development of related fields that use light propagation as a medium.

[0080] It should be noted that some embodiments of the present invention are described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the above embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0081] Based on the same inventive concept, corresponding to any of the above-described method embodiments, the present invention also provides a multi-tilt mirror quantum communication interaction method.

[0082] A multi-tilt mirror quantum communication interaction method includes:

[0083] The first voice coil tilt mirror 1 is disposed on the propagation path of the incident light to eliminate low-frequency jitter errors and generate low-frequency corrected light;

[0084] The first beam splitter 2 is disposed on the propagation path of the low-frequency corrected light to divide the low-frequency corrected light into a first split beam and a second split beam;

[0085] The first condenser lens 3 is disposed on the propagation path of the first split beam to focus the first split beam onto the first fine tracking detector 4;

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

[0087] The second voice coil tilt mirror 5 is disposed on the propagation path of the second split beam to eliminate high-frequency jitter errors and generate high-frequency corrected light;

[0088] The mirror 6 is disposed on the propagation path of the high-frequency corrected light to propagate the high-frequency corrected light to the second beam splitter 7;

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

[0090] The second condenser lens 8 is disposed on the propagation path of the third split beam to focus the third split beam onto the second fine tracking detector 9;

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

[0092] The fourth beam splitting is propagated as the outgoing light.

[0093] The method of the above embodiment is used for a corresponding multi-tilt mirror quantum communication device in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be elaborated herein.

[0094] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of brevity.

[0095] In the case of elaborating specific details to describe the exemplary embodiments of the present invention, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive. Although the present invention has been described in conjunction with specific embodiments of the present invention, many substitutions, modifications, and variations of these embodiments will be obvious to those of ordinary skill in the art based on the foregoing description.

[0096] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent substitution, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-tilt mirror quantum communication device, characterized in that: include: a first voice coil tilt mirror, a first beam splitter, a first condensing lens, a first fine tracking detector, a second voice coil tilt mirror, a reflecting mirror, a second beam splitter, a second condensing lens, and a second fine tracking detector; The first voice coil tilt mirror is arranged on the propagation path of the incident light, and is used to eliminate low-frequency jitter errors and generate low-frequency correction light; The first beam splitter is arranged on the propagation path of the low-frequency correction light, and splits the low-frequency correction light into a first beam and a second beam; The first condenser lens is arranged on the propagation path of the first beamlet, and focuses the first beamlet onto the first precision tracking detector; The first fine tracking detector calculates an error of the first beam splitter and transmits the error of the first beam splitter to a processor, so that the processor controls the first voice coil tilt mirror to adjust a tilt angle; The second voice coil tilt mirror is arranged on the propagation path of the second beam splitter, and is used to eliminate high-frequency jitter errors and generate high-frequency correction light; The reflector is arranged on the propagation path of the high-frequency correction light, and propagates the high-frequency correction light to the second beam splitter; The second beam splitter splits the high-frequency corrected light into a third beam and a fourth beam; The second condenser lens is arranged on the propagation path of the third beam, and focuses the third beam onto the second precision tracking detector; The second fine tracking detector calculates the error of the third beam splitter and transmits the error of the third beam splitter to the processor, so that the processor controls the second voice coil tilt mirror to adjust the tilt angle; The fourth partial beam propagates as output light.

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

3. A multi-tilt mirror quantum communication device according to claim 1, characterized in that: The first fine tracking detector calculates the error of the current first beam splitting including: The first split beam enters the first fine tracking detector, and forms a first light spot signal on the first fine tracking detector; The first fine tracking detector converts the first light spot signal into a current signal distributed on the first fine tracking detector, converts it into a digital second light spot signal through A / D, and calculates a second light spot energy signal according to the second light spot signal; Obtain the angle difference of the second spot energy signal on the x and y planes, calculate the deviation between the angle difference and the expected angle, and obtain the error of the current first beam splitting: e1 Δθx =r1 x -Δθ1 x e1 Δθy =r1 y -Δθ1 y Among them, e1 Δθx represents the error of the first beam splitter in the x-plane, r1 x represents the expected angle of the second spot energy signal on the x-plane, Δθ1 x Represents the angle difference of the second spot energy signal on the x-plane, e1 Δθy represents the error of the first beam splitter in the y plane, r1 y represents the expected angle of the second spot energy signal on the y plane, Δθ1 y Represents the angular difference of the second light spot energy signal in the first beam on the y plane.

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

5. A multi-tilt mirror quantum communication device according to claim 1, characterized in that: The second fine tracking detector calculates the error of the current third beam splitting including: The third split beam enters the second fine tracking detector, and forms a third light spot signal on the second fine tracking detector; The second fine tracking detector converts the third light spot signal into a current signal distributed on the second fine tracking detector, converts it into a digital fourth light spot signal through A / D, and calculates a fourth light spot energy signal according to the fourth light spot signal; Obtain the angle difference of the fourth spot energy signal on the x and y planes, calculate the deviation between the angle difference and the expected angle, and obtain the error of the current third beam splitting: e2 Δθx =r2 x -Δθ2 x e2 Δθy =r2 y -Δθ2 y Among them, e2 Δθx represents the error of the third beam splitter in the x-plane, r2 x represents the expected angle of the fourth spot energy signal on the x-plane, Δθ2 x represents the angle difference of the energy signal of the fourth light spot on the x-plane, e2 Δθy represents the error of the third beam splitter in the y plane, r2 y represents the expected angle of the fourth spot energy signal on the y plane, Δθ2 y Represents the angular difference of the fourth light spot energy signal in the first beam on the y plane.

6. A multi-tilt mirror quantum communication interaction method, characterized in that: A multi-tilt mirror quantum communication device as claimed in any one of claims 1 to 4, comprising: The first voice coil tilt mirror is arranged on the propagation path of the incident light, and is used to eliminate low-frequency jitter errors and generate low-frequency correction light; The first beam splitter is arranged on the propagation path of the low-frequency correction light, and splits the low-frequency correction light into a first beam and a second beam; A first condenser lens is arranged on a propagation path of the first beamlet, and focuses the first beamlet onto a first precision tracking detector; The first fine tracking detector calculates the error of the first beam splitting 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 arranged on the propagation path of the second beam splitter, and is used to eliminate high-frequency jitter errors and generate high-frequency correction light; The reflector is arranged on the propagation path of the high-frequency correction light to propagate the high-frequency correction light to the second beam splitter; The second beam splitter splits the high-frequency corrected light into a third beam and a fourth beam; A second condensing lens is arranged on the propagation path of the third beam, focusing the third beam onto a second precision tracking detector; The second fine tracking detector calculates the error of the third beam splitting 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 partial beam propagates as output light.

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