Mechanical optical pulse modulator and modulation method

Abstract

This application provides a mechanical optical pulse modulator and modulation method. The mechanical optical pulse modulator includes: a light source; a motor flywheel; at least one wedge mirror disposed on the outer edge of the motor flywheel, the wedge mirror being configured to reflect light emitted from the light source when the wedge mirror is rotated to a position where the center of the motor flywheel and the light source are aligned and facing the light source; and a micro-reflector located in the direction of the reflected light emission from the wedge mirror, used to reflect the light reflected by the wedge mirror, wherein the micro-reflector includes a light reflecting component and a light absorbing component, the light absorbing component being used to absorb light around the light reflecting component. The mechanical optical pulse modulator provided by this application solves the problems of high cost and complex adjustment methods in existing optical pulse modulation devices.

Description

Technical Field

[0001] This invention relates to the field of pulsed laser modulation, and specifically to a mechanical optical pulse modulator and modulation method. Background Technology

[0002] Laser pulse sources can be used to measure the time constant of photodetectors. For detectors with large time constants (on the order of milliseconds), a mechanical chopper with a low modulation frequency can be used for measurement. For fast-response photovoltaic infrared detectors (on the order of nanoseconds), a nanosecond-level laser pulse source is required for measurement.

[0003] Existing laser pulse sources typically employ photoelectric modulation to generate ultrashort optical pulses. However, the principle is complex, the modulation method is not flexible or convenient enough, and the equipment is usually very expensive, making it unsuitable for routine testing of infrared detectors. Summary of the Invention

[0004] In view of this, the embodiments of this application aim to provide a mechanical optical pulse modulator and modulation method to solve the problems of high cost and complex modulation process of optical pulse modulation equipment in the prior art.

[0005] This application provides a mechanical optical pulse modulator, comprising: a light source; a motor flywheel; at least one wedge mirror disposed on the outer edge of the motor flywheel, the wedge mirror being configured to reflect light emitted from the light source when the wedge mirror is rotated to a position where the center of the motor flywheel and the light source are aligned and facing the light source; and a micromirror located in the direction of the reflected light emitted by the wedge mirror for reflecting light reflected from the wedge mirror, wherein the micromirror includes a light reflecting component and a light absorbing component, the light absorbing component being used to absorb light around the light reflecting component.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, the mechanical optical pulse modulator provided in this embodiment further includes: a first movable control device, fixedly connected to the micromirror, for controlling the movement of the micromirror in a direction perpendicular to the horizontal plane.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the first movable control device includes: a first piezoelectric ceramic, fixedly connected to the micromirror, for adjusting the movement of the micromirror in a direction perpendicular to the horizontal plane.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the repetition frequency of the optical pulses of the mechanical pulse modulator is determined based on at least one of the following: the periodic movement frequency of the first movable control device; the number of wedge mirrors.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the pulse width of the optical pulse of the mechanical pulse modulator is determined based on at least one of the following: the distance from the axis of the motor flywheel to the micromirror; the rotational angular velocity of the motor flywheel; and the width of the optical reflecting component.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the mechanical optical pulse modulator provided in this embodiment further includes: at least one second movable control device disposed on the outer edge of the motor flywheel, for adjusting the angle and position of at least one wedge mirror relative to the motor flywheel, wherein the wedge mirror is disposed on the second movable control device, and at least one second movable control device corresponds one-to-one with at least one wedge mirror.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the second movable control device includes: a second piezoelectric ceramic, fixedly connected to the wedge mirror, for adjusting the angle of the wedge mirror and its position relative to the motor flywheel.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the mechanical optical pulse modulator provided in this embodiment further includes: a first converging lens, aligned with the center of the light source and located between the light source and the motor flywheel, for converging the light from the light source; an optical path control device, located in the light emission direction of the micromirror, for changing the propagation direction of the light emitted from the micromirror; and a second converging lens, located in the light emission direction of the optical path control device, for collecting and outputting the light emitted from the optical path control device.

[0013] Secondly, this application also provides a method for modulating a mechanical optical pulse, applied to the mechanical optical pulse modulator provided in the above embodiments. The method includes: generating light to be modulated through a light source; reflecting the light to be modulated onto a micromirror through at least one wedge mirror disposed on a motor flywheel to form a first outgoing light, so that the first outgoing light is reflected by the micromirror to form an optical pulse.

[0014] In conjunction with the second aspect, in some implementations of the first aspect, the mechanical optical pulse modulation method provided in this embodiment further includes at least one of the following steps: adjusting the rotational angular velocity of the motor flywheel to adjust the width of the optical pulse; adjusting the distance from the axis of the motor flywheel to the micromirror to adjust the width of the optical pulse; adjusting the periodic movement frequency of the micromirror to adjust the repetition frequency of the optical pulse; and adjusting the number of wedge mirrors to adjust the repetition frequency of the optical pulse.

[0015] The mechanical optical pulse modulator and modulation method provided in this application can achieve sub-microsecond optical pulse widths. It is easy to operate, has a simple structure that is easy to assemble, and allows for easy replacement of any component for convenient equipment maintenance. Furthermore, it is highly practical and can replace expensive sub-microsecond laser pulse equipment on the market for related experiments or tests. It solves the problems of high cost and complex modulation processes in existing optical pulse modulation equipment. Attached Figure Description

[0016] The embodiments of this application will now be described in more detail with reference to the accompanying drawings, and the above and other objects, features, and advantages of this application will become more apparent. The accompanying drawings are provided to further illustrate the embodiments of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 The diagram shown is a structural schematic of a single wedge-shaped mirror mechanical optical pulse modulator provided in an embodiment of this application.

[0018] Figure 2 As shown Figure 1 The diagram shows the structure of the micromirror in the single-wedge mirror mechanical optical pulse modulator.

[0019] Figure 3 The diagram shown is a structural schematic of a multi-wedge mirror mechanical optical pulse modulator provided in an embodiment of this application.

[0020] Figure 4 As shown Figure 1 The diagram shows the structure of the motor flywheel assembly in the single wedge mirror mechanical optical pulse modulator.

[0021] Figure 5 The diagram shown is a flowchart of a mechanical optical pulse modulation method provided in an embodiment of this application.

[0022] Figure 6 The diagram shown is a flowchart of a mechanical optical pulse modulation method provided in another embodiment of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Application Overview

[0025] The basic concept of this application is to propose a mechanical optical pulse modulator and modulation method to solve the problems of high cost and complex modulation process in existing optical pulse modulation equipment.

[0026] The mechanical optical pulse modulator provided in this application includes: a light source; a motor flywheel; at least one wedge mirror disposed on the outer edge of the motor flywheel, the wedge mirror being configured to reflect light emitted from the light source when the wedge mirror is rotated to be aligned with the center of the motor flywheel and the light source and facing the light source; and a micro-reflector located in the direction of reflected light emission from the wedge mirror for reflecting light reflected from the wedge mirror, wherein the micro-reflector includes a light reflecting component and a light absorbing component, the light absorbing component being used to absorb light around the light reflecting component.

[0027] The mechanical optical pulse modulation method provided in this application includes: generating light to be modulated through a light source; reflecting the light to be modulated onto a micromirror through at least one wedge mirror disposed on a motor flywheel to form a first outgoing light, so that the first outgoing light is reflected by the micromirror to form an optical pulse.

[0028] Various non-limiting embodiments of this application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of them. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0029] Exemplary device

[0030] Figure 1 The diagram shown is a structural schematic of a single wedge-shaped mirror mechanical optical pulse modulator provided in an embodiment of this application. Figure 2 As shown Figure 1 The diagram shows the structure of the micromirror in the single-wedge mirror mechanical optical pulse modulator.

[0031] like Figure 1 and Figure 2 As shown, the single wedge mirror mechanical optical pulse modulator provided in this embodiment includes: a light source 13; a motor flywheel 1; a wedge mirror 5 disposed on the outer edge of the motor flywheel 1, the wedge mirror 5 being configured to reflect the light emitted from the light source 13 when the wedge mirror 5 is rotated to be aligned with the center of the motor flywheel 1 and the light source 13 and facing the light source 13; and a micro-reflector 9 located in the direction of reflected light emission of the wedge mirror 5, used to reflect the light reflected by the wedge mirror 5, wherein the micro-reflector 9 includes a light reflecting component 92 and a light absorbing component 91, the light absorbing component 91 being used to absorb the light around the light reflecting component 92.

[0032] Preferably, the single wedge mirror mechanical optical pulse modulator provided in this embodiment further includes a shielding box 12, which is used to isolate the device from possible interference caused by external ambient light.

[0033] like Figure 1 As shown, a button battery pack is also installed at the center of the shaft on the upper surface of the cylindrical motor flywheel 1 to power the electric flywheel. It is understood that other types of battery packs, such as mobile power supplies or stationary power supplies, can also be used to power the electric flywheel 1; this application does not impose any limitations on this.

[0034] According to the single wedge mirror mechanical optical pulse modulator provided in this embodiment, specifically, the distance from the axis of the motor flywheel 1 to the micro-reflector 9 is R, the rotational speed of the motor flywheel 1 is n, the corresponding rotational angular velocity is ω, the number of wedge mirrors 5 is N = 1, and the width of the light reflecting component of the micro-reflector 9 is d; then, when the motor flywheel 1 starts, the light emitted from the light source 13 is reflected by the wedge mirror 5 and the micro-reflector 9, and the duration of the resulting optical pulse is:

[0035] Δt=d / ωR (1)

[0036] As can be seen from formula (1), the pulse width of the light pulse, Δt, is determined by the distance R from the axis of the motor flywheel 1 to the micro-reflector 9, the rotational angular velocity of the motor flywheel 1, ω, and the width d of the light reflecting component of the micro-reflector 9. Furthermore, the pulse width can be adjusted by adjusting any one of these factors.

[0037] The repetition frequency of the light pulse is:

[0038] F=Nω / 2π (2)

[0039] As shown in formula (2), the repetition frequency F of the light pulse is determined by the rotational angular velocity ω of the motor flywheel 1 and the number N of the wedge mirrors 5. By changing the number of wedge mirrors 5, the repetition frequency of the light pulse can be controlled to increase by a factor of two. Alternatively, the repetition frequency of the light pulse can also be adjusted by changing the rotational angular velocity ω of the motor flywheel 1.

[0040] For example, the light-reflecting component 92 of the micromirror 9 is a rectangular Cr / Au coating with a width d of 31.4 μm, and the light-absorbing component 91 is a black paint absorption coating around the perimeter of the coating. When light strikes the light-absorbing component 91, no reflected light is generated. Therefore, when light sweeps across the micromirror 9, reflected light is only generated when it sweeps across the light-reflecting component 92, thus forming a light pulse. It is understood that the light-absorbing component 91 can be made of any material that can completely absorb light incident on its surface, and this application does not limit this.

[0041] For example, when the distance from the axis of the motor flywheel 1 to the micro-reflector 9 is R = 10 cm, the rotational speed of the motor flywheel 1 is n = 1 r / s, that is, the rotational angular velocity is ω = 2π rad / s, the number of wedge mirrors 5 is N = 1, and the width of the light reflecting component of the micro-reflector 9 is d = 31.4 μm; the duration of the light pulse is Δt = 50 μs, and the repetition frequency of the light pulse is F = 1 Hz.

[0042] The pulse width of the optical pulse can be adjusted by regulating the distance R from the axis of the motor flywheel 1 to the micromirror 9 in the single-wedge mirror mechanical optical pulse modulator, the rotational speed n of the motor flywheel 1, and the width d of the light-reflecting component of the micromirror 9. As can be seen from the above, when the rotational speed of the motor flywheel 1 is low, the corresponding optical pulse duration is on the order of microseconds, meaning that an optical pulse with a pulse width on the order of microseconds can be formed. The repetition frequency is also low. This operating mode is suitable for determining the time constant of photothermal detectors with slow response speeds (time constant on the order of milliseconds).

[0043] Figure 3 The diagram shown is a structural schematic of a multi-wedge mirror mechanical optical pulse modulator provided in an embodiment of this application. Figure 3 As shown, the multi-wedge mirror mechanical optical pulse modulator provided in this application has a wedge mirror number N greater than or equal to 2. The multi-wedge mirror mechanical optical pulse modulator provided in this embodiment includes: a light source 13; a motor flywheel 1; 16 wedge mirrors 5, evenly spaced on the outer edge of the motor flywheel, the wedge mirrors 5 being configured to reflect light emitted from the light source 13 when the wedge mirrors 5 rotate to a position where the center of the motor flywheel 1 and the light source 13 are aligned and facing the light source 13; and a micro-reflector 9, located in the direction of reflected light emission from the wedge mirrors 5, used to reflect light reflected from the wedge mirrors 5. The micro-reflector 9 includes a light reflecting component 92 and a light absorbing component 91, the light absorbing component 91 absorbing light around the light reflecting component 92.

[0044] For example, when the distance from the axis of the motor flywheel 1 to the micro-reflector 9 is R = 10cm, the rotational speed of the motor flywheel 1 is n = 160r / s, that is, the rotational angular velocity is ω = 320πrad / s, the number of wedge mirrors 5 is N = 16, and the width of the light reflecting component of the micro-reflector 9 is d = 31.4μm, according to formulas (1) and (2), the duration of the light pulse is Δt = 312.5ns, and the repetition frequency of the light pulse is F = 2560Hz.

[0045] As can be seen from the above, when the speed of the motor flywheel 1 is high, the duration of the corresponding optical pulse is in the sub-microsecond range, that is, an optical pulse with a pulse width in the sub-microsecond range can be formed, and the repetition frequency can reach thousands of hertz. This working mode is suitable for the determination of the time constant of photoelectric detectors with fast response speed (time constant in the microsecond range).

[0046] The mechanical optical pulse modulator provided in this application embodiment can rapidly change the pulse width of the optical pulse through single-type or combined adjustment. This involves adjusting one or more of the following: the rotational speed of the motor flywheel, the distance from the flywheel's axis to the micromirror, and the width of the light-reflecting component. It is easy to operate, has a simple structure that is easy to assemble, and allows for easy replacement of any component for convenient equipment maintenance. Furthermore, it is highly practical and can replace expensive sub-microsecond laser pulse equipment on the market for related experiments or tests.

[0047] In addition, the mechanical optical pulse modulator provided in this application embodiment can also adjust the repetition frequency of the optical pulse through single-type adjustment or combined-type adjustment, that is, by adjusting the speed of the motor flywheel and / or controlling the number of wedge mirrors, to adapt to different types of test and experimental requirements.

[0048] Preferably, the mechanical optical pulse modulator provided in one embodiment of this application further includes: a first movable control device 6, which is fixedly connected to the micromirror 9 and is used to control the movement of the micromirror 9 in a direction perpendicular to the horizontal plane.

[0049] Specifically, when the rotational speed of the motor flywheel 1 is n, correspondingly, when the rotational angular velocity is ω, and the number of wedge mirrors 5 is N, the repetition frequency of the light pulse generated by the mechanical light pulse modulator provided in this application is F = Nω / 2π, and the period is T = 1 / F, i.e., T = 2π / Nω. Therefore, the number of times the light sweeps the micromirror 9 in one second is F. In the first period, after the reflected light just sweeps past the micromirror 9, the micromirror 9 is controlled to move downwards so that the reflected light spot cannot illuminate the light-reflecting component of the micromirror 9; in the Mth period, the micromirror 9 is controlled to move back to its original position, and the repetition frequency of the light pulse will then become F / M, i.e., F = Nω / M²π, where M is a positive integer.

[0050] For example, when the rotational speed of the motor flywheel 1 is n=1, the corresponding rotational angular velocity is ω=2πrad / s, and when the number of wedge mirrors 5 is N=1, the repetition frequency of the light pulse is F=1Hz. When M=10, that is, in the first cycle, after the reflected light just sweeps past the micro-reflector 9, the micro-reflector 9 is controlled to move downward so that the reflected light spot cannot illuminate the light reflecting component of the micro-reflector 9; in the Mth cycle, that is, in the 10th cycle, the micro-reflector 9 is controlled to move back to its original position. At this time, the repetition frequency will become F / M, that is, F=0.1Hz. In other words, by controlling the periodic movement frequency of the first movable control device 6, the repetition frequency of the light pulse of the mechanical pulse modulator can be adjusted.

[0051] Preferably, the first movable control device 6 includes a first piezoelectric ceramic. By controlling the voltage of the first piezoelectric ceramic, the displacement of the first piezoelectric ceramic can be changed, thereby controlling the movement of the micro-reflector 9 in the direction perpendicular to the horizontal.

[0052] Preferably, such as Figure 2 As shown, the micro-mirror 9 is mounted on the side surface of the right-angle bracket 11 and then on the first movable control device 6.

[0053] The mechanical optical pulse modulator provided in this application embodiment can adjust the repetition frequency of the optical pulse to an integer multiple by controlling the movement of the micro-mirror in a direction perpendicular to the horizontal plane.

[0054] Figure 4 As shown Figure 1 The diagram shows the structure of the motor flywheel assembly in a single-wedge mirror mechanical optical pulse modulator. Figure 4 As shown, in one embodiment, the mechanical optical pulse modulator provided in this application further includes: at least one second movable control device 15, disposed on the outer edge of the motor flywheel, for adjusting the angle and position of at least one wedge mirror 5 relative to the motor flywheel 1, wherein the wedge mirror 5 is disposed on the second movable control device 15, and at least one second movable control device 15 corresponds to at least one wedge mirror 5.

[0055] The mechanical optical pulse modulator provided in this application embodiment can fine-tune the position of the corresponding wedge mirror by adjusting the second movable control device to ensure the consistency of the optical pulses formed by the multiple wedge mirrors when the mechanical optical pulse modulator is equipped with multiple wedge mirrors.

[0056] Preferably, the second movable control device 15 includes a second piezoelectric ceramic, which is fixedly connected to the wedge mirror 5 and is used to adjust the angle of the wedge mirror 5 and its position relative to the motor flywheel 1.

[0057] For example, such as Figure 4 As shown, adjustable resistors 3 and level control chips 4 for controlling piezoelectric ceramics are symmetrically mounted on both sides of the motor flywheel 1; the wedge-shaped mirrors 5 and the second piezoelectric ceramics are combined on the flywheel side surface, and a counterweight 7 is located on the other symmetrical side. The level control chip 4 is used to adjust the voltage of the second piezoelectric ceramics, thereby controlling the degree of extension and retraction of the second piezoelectric ceramics to fine-tune the position of each wedge-shaped mirror 5. It is understood that the voltage of the second piezoelectric ceramics can also be adjusted by other types of electronic devices, and this application does not limit this.

[0058] Preferably, such as Figure 1As shown, in one embodiment, the mechanical optical pulse modulator provided in this application further includes: a first converging lens 8, aligned with the center of the light source 13 and located between the light source 13 and the motor flywheel 1, for converging the light from the light source 13; an optical path control device 10, located in the light emission direction of the micro-reflector 9, for changing the propagation direction of the light emitted from the micro-reflector 9; and a second converging lens 14, located in the light emission direction of the optical path control device 10, for collecting and outputting the light emitted from the optical path control device 10.

[0059] Specifically, the first converging lens 8 focuses the light, and the combination of the first movable control device 6, the right-angle bracket 11, and the micro-reflector 9 reflects the light reflected by the wedge mirror 5 onto the optical path control device 10. The second converging lens 14 collects and outputs the modulated light.

[0060] The mechanical optical pulse modulator provided in this application embodiment can further converge the optical pulse light through a converging lens and change the direction of light propagation through an optical path control device, thereby saving the space occupied by the device.

[0061] Exemplary methods

[0062] Figure 5 The diagram illustrates a method for modulating a mechanical optical pulse according to an embodiment of this application, applied to the mechanical optical pulse modulator provided in the above embodiment. For example... Figure 5 As shown, the modulation method of mechanical optical pulses includes the following steps:

[0063] S100: Generates the light to be modulated using a light source.

[0064] S200: The light to be modulated is reflected to the micromirror by at least one wedge mirror disposed on the motor flywheel to form a first outgoing light, so that the first outgoing light is reflected by the micromirror to form a light pulse.

[0065] The mechanical optical pulse modulation method provided in this application provides an optical path that is easy to adjust, and the pulse width of the optical pulse can be modulated by adjusting the rotation speed of the motor flywheel and the relative position of each component. Therefore, the modulation method is easy to operate and can quickly modulate the pulse width of the optical pulse.

[0066] Figure 6 The diagram shown is a schematic flowchart of a mechanical optical pulse modulation method provided in another embodiment of this application, applied to the mechanical optical pulse modulator provided in the above embodiment. Figure 5 Extending from the illustrated embodiment Figure 6 The illustrated embodiment will be described in detail below. Figure 6 The illustrated embodiments and Figure 5 The differences between the embodiments shown are not repeated here, and the similarities are not repeated here.

[0067] like Figure 6 As shown, the mechanical optical pulse modulation method further includes at least one of the following steps:

[0068] S300: Adjust the rotational angular velocity of the motor flywheel to adjust the width of the light pulse.

[0069] S400: Adjust the distance from the motor flywheel axis to the micromirror to adjust the width of the light pulse.

[0070] S500: Adjust the periodic shift frequency of the micromirror to adjust the repetition frequency of the light pulse.

[0071] S600: Adjust the number of wedges to adjust the repetition frequency of the light pulse.

[0072] Specifically, when the distance from the axis of the motor flywheel to the micromirror is R, the rotational speed of the motor flywheel is n, the corresponding angular velocity of rotation is ω, the number of wedge mirrors is N = 1, and the width of the light-reflecting component of the micromirror is d; then, when the motor flywheel starts, the light emitted from the light source is reflected by the wedge mirror and the micromirror, and the duration of the resulting light pulse is: Δt = d / ωR. The repetition frequency of the light pulse is: F = Nω / 2π.

[0073] As described above, the pulse width Δt of the optical pulse is determined by the distance R from the axis of the motor flywheel to the micromirror, the angular velocity ω of the motor flywheel, and the width of the light-reflecting component of the micromirror. Furthermore, the pulse width can be adjusted by changing any one of these factors. The repetition frequency F of the optical pulse is determined by the angular velocity ω of the motor flywheel and the number N of wedge mirrors. By changing the number of wedge mirrors, the repetition frequency of the optical pulse can be controlled to increase exponentially.

[0074] The mechanical optical pulse modulation method provided in this application can rapidly change the pulse width of the optical pulse through single or combined adjustments. Specifically, it can be achieved by adjusting one or more of the following: the rotational speed of the motor flywheel, the distance from the flywheel's axis to the micromirror, and the width of the optical reflecting component. This method is convenient to operate, has a simple and easy-to-assemble structure, and allows for easy replacement of any component for convenient equipment maintenance. Furthermore, it can replace expensive sub-microsecond laser pulse equipment on the market for related experiments or tests.

[0075] It is understood that in the various embodiments described in this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments described in this specification.

[0076] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments described herein, and are not intended to limit the scope of the invention.

[0077] It is understood that the various implementation methods described in this specification can be implemented individually or in combination, and the implementation methods in this specification are not limited in this respect.

[0078] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0079] In the several embodiments provided in this specification, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of components is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The units described as separate components may or may not be physically separate; some or all of the units may be selected according to actual needs to achieve the purpose of this embodiment.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mechanical optical pulse modulator, characterized in that, include: light source; Motor flywheel; At least one wedge-shaped mirror is disposed on the outer edge of the motor flywheel. The wedge-shaped mirror is configured to reflect the light emitted from the light source when the wedge-shaped mirror is rotated to be aligned with the center of the motor flywheel and the light source and facing the light source. A micromirror, located in the direction of light emission from the wedge mirror, is used to reflect light reflected from the wedge mirror. The micromirror includes a light reflecting component and a light absorbing component, and the light absorbing component is used to absorb light around the light reflecting component.

2. The mechanical optical pulse modulator according to claim 1, characterized in that, Also includes: A first movable control device is fixedly connected to the micromirror and is used to control the movement of the micromirror in a direction perpendicular to the horizontal plane.

3. The mechanical optical pulse modulator according to claim 2, characterized in that, The first movable control device includes: The first piezoelectric ceramic is fixedly connected to the micromirror and is used to adjust the movement of the micromirror in a direction perpendicular to the horizontal plane.

4. The mechanical optical pulse modulator according to claim 2, characterized in that, The repetition frequency of the optical pulses in the mechanical pulse modulator is determined based on at least one of the following: The periodic movement frequency of the first movable control device; The number of wedge mirrors.

5. The mechanical optical pulse modulator according to claim 1, characterized in that, The pulse width of the optical pulse in the mechanical pulse modulator is determined based on at least one of the following: The distance from the axis of the motor flywheel to the micro-reflector; The rotational angular velocity of the motor flywheel; The width of the light-reflecting component.

6. The mechanical optical pulse modulator according to claim 1, characterized in that, Also includes: At least one second movable control device is disposed on the outer edge of the motor flywheel for adjusting the angle and position of the at least one wedge mirror relative to the motor flywheel, wherein the wedge mirror is disposed on the second movable control device, and the at least one second movable control device corresponds one-to-one with the at least one wedge mirror.

7. The mechanical optical pulse modulator according to claim 6, characterized in that, The second movable control device includes: The second piezoelectric ceramic is fixedly connected to the wedge mirror and is used to adjust the angle of the wedge mirror and its position relative to the motor flywheel.

8. The mechanical optical pulse modulator according to claim 1, characterized in that, Also includes: The first converging lens, aligned with the center of the light source, is located between the light source and the motor flywheel and is used to converge the light from the light source. An optical path control device is located in the light emission direction of the micromirror and is used to change the propagation direction of the light emitted from the micromirror. The second converging lens is located in the light emission direction of the optical path control device and is used to collect and output the light emitted by the optical path control device.

9. A method for modulating mechanical optical pulses, characterized in that, Applied to the mechanical optical pulse modulator according to any one of claims 1 to 8; The method includes: The light to be modulated is generated by a light source; The light to be modulated is reflected to a micromirror by at least one wedge-shaped mirror disposed on the motor flywheel to form a first outgoing light, so that the first outgoing light is reflected by the micromirror to form a light pulse.

10. The method for modulating a mechanical optical pulse according to claim 9, further comprising at least one of the following steps: The rotational angular velocity of the motor flywheel is adjusted to adjust the width of the light pulse; The distance from the axis of the motor flywheel to the micromirror is adjusted to adjust the width of the light pulse; The periodic movement frequency of the micromirror is adjusted to adjust the repetition frequency of the light pulse; The number of wedges is adjusted to adjust the repetition frequency of the light pulse.

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