Optical configuration with low angular resolution

Abstract

The utility model relates to the technical field of laser and photoelectron, in particular to an optical configuration with low angular resolution. Comprising a laser module, a pinhole diaphragm and an optical antenna, and the small-hole diaphragm is placed between the laser and the optical antenna. Therefore, the laser module, the aperture diaphragm and the optical antenna are coaxially arranged, and the aperture diaphragm is added in the design of a conventional optical configuration to limit the edge light beam of the laser and control the initial light beam diameter, so that the angular resolution is effectively reduced, and the interference of stray light on other systems is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers and optoelectronics, and more specifically, to an optical configuration with low angular resolution. Background Art

[0002] Devices such as laser rangefinders and lidar are currently not only applied in national defense technology, but also have been increasingly widely used in daily life, and the requirements for the functional performance of products are also getting higher and higher. Some products have certain requirements for angular resolution. The divergence angle is the angle corresponding to the point at the 1 / e2 of the peak energy of the beam, and the beam beyond the 1 / e2 also has a certain ranging ability to a certain extent. The core of improving angular resolution lies in controlling the beam diameter and energy outside the 1 / e2. When the existing optical configurations select targets, there is generally a problem that the angular resolution is much larger than the divergence angle. Summary of the Utility Model

[0003] To overcome the problems existing in the related art at least to a certain extent, the purpose of this application is to provide an optical configuration with low angular resolution, which can solve the problem that the angular resolution of the optical configuration in the prior art is much larger than the divergence angle.

[0004] This application provides an optical configuration with low angular resolution, including a laser module, a small hole aperture, and an optical antenna;

[0005] The small hole aperture is placed between the laser and the optical antenna.

[0006] In some embodiments, the optical antenna includes a first spherical mirror, a second spherical mirror, and a third spherical mirror, and each device is arranged in sequence along the propagation direction of the output beam and the central axes coincide.

[0007] In some embodiments, the first spherical mirror is recessed inward on the side close to the laser to form a first arc surface;

[0008] The second spherical mirror is recessed inward on the side far from the first spherical mirror to form a second arc surface;

[0009] The third spherical mirror extends outward on the side far from the second spherical mirror to form a third arc surface.

[0010] In some embodiments, the wavelength of the laser module is 1535 nm, the output energy is greater than 200 μJ, the beam diameter is 0.3 mm, and the inner diameter of the small hole aperture is 0.26 mm.

[0011] In some embodiments, the outer diameter of the first spherical mirror is 8 mm;

[0012] The radius of curvature of the first arc surface is 4.733 mm - 5.733 mm;

[0013] The central thickness of the first spherical mirror is 1.9 mm - 2.1 mm;

[0014] The outer diameter of the second spherical mirror is 8 mm;

[0015] The radius of curvature of the second arc surface is 5.086 mm - 6.0586 mm;

[0016] The central thickness of the second spherical mirror is 1.9 mm - 2.1 mm;

[0017] The outer diameter of the third spherical mirror is 8 mm;

[0018] The radius of curvature of the third arc surface is 19.655 mm - 20.655 mm;

[0019] The central thickness of the third spherical mirror is 2.4 mm - 2.6 mm.

[0020] In some embodiments, the material of the first spherical mirror is H-K9L;

[0021] The material of the second spherical mirror is H-ZF6;

[0022] The material of the third spherical mirror is H-K9L.

[0023] In some embodiments,

[0024] Both sides of the first spherical mirror, the second spherical mirror and the third spherical mirror need to be coated with an antireflection film in the wavelength range of 1530 nm - 1540 nm.

[0025] The technical solution provided by this application may include the following beneficial effects: The laser module, the small hole aperture and the optical antenna are coaxially arranged. A small hole aperture is added to the design of the conventional optical configuration to limit the edge beam of the laser, control the initial beam diameter, thereby effectively reducing the angular resolution and avoiding the interference of stray light to other systems. This configuration is simple and effective. The original divergence angle of the antenna is 1 mrad, and the angular resolution is 1.8 mrad. After adding the small hole aperture, the angular resolution is reduced to 1.3 mrad.

[0026] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0027] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 is a structural diagram of an optical configuration for reducing angular resolution shown according to some exemplary embodiments;

[0030] In the figure: 1. Laser module, 2. Small hole aperture, 31. First spherical mirror, 32. Second spherical mirror, 33. Third spherical mirror. Detailed implementation manners

[0031] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices or methods consistent with some aspects of the present application.

[0032] The present detailed implementation manner provides an optical configuration with low angular resolution. The laser module, the small hole aperture, and the optical antenna are coaxially arranged. A small hole aperture is added to the design of the conventional optical configuration to limit the edge beam of the laser, control the initial beam diameter, thereby effectively reducing the angular resolution, and avoiding the interference of stray light to other systems. This configuration is simple and effective. The original antenna divergence angle is 1 mrad, and the angular resolution is 1.8 mrad. After adding the small hole aperture, the angular resolution is reduced to 1.3 mrad, which can solve the problem that the angular resolution of the optical configuration in the prior art is much larger than the divergence angle.

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will describe the technical solutions of the present invention in detail. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0034] Hereinafter, the embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not limit the content of the invention described in the claims in any way. In addition, all the contents shown in the following embodiments are not necessarily essential to the solution of the invention described in the claims.

[0035] Reference Figure 1, this specific embodiment provides an optical configuration with low angular resolution, including a laser module 1, a small aperture diaphragm 2, and an optical antenna arranged coaxially;

[0036] The small aperture diaphragm 2 is placed between the laser and the optical antenna.

[0037] In this way, the laser module 1, the small aperture diaphragm 2, and the optical antenna are coaxially arranged. The small aperture diaphragm 2 is added to the design of the conventional optical configuration to limit the edge beam of the laser, control the initial beam diameter, thereby effectively reducing the angular resolution, and avoiding the interference of stray light to other systems. This configuration is simple and effective. The original antenna divergence angle is 1 mrad, and the angular resolution is 1.8 mrad. After adding the small aperture diaphragm 2, the angular resolution is reduced to 1.3 mrad.

[0038] In fact, coaxial arrangement is an important layout method in optical systems. It means that the central axes of each optical element (such as lenses, mirrors, diaphragms, etc.) in the system coincide with each other and are arranged in sequence along the propagation direction of the light beam. This arrangement method is very common in optical instruments and systems, especially in applications that require precise control of the light beam direction and shape.

[0039] The laser module 1 serves as the light source of the entire optical system and provides the required laser beam.

[0040] The small aperture diaphragm 2 is placed between the laser and the optical antenna. Its main function is to limit the light beam emitted by the laser, especially the edge beam beyond the 1 / e^2 of the beam energy. By restricting these edge beams, the small aperture diaphragm 2 can effectively control the divergence angle of the light beam, thereby reducing the angular resolution.

[0041] The optical antenna is a device used to control and manipulate light beams. Its role in the optical system is similar to that of an antenna in radio communication, and it can receive, transmit, or focus light beams. In an optical system, an optical antenna can be used to improve the directivity of the light beam, enhance the focusing ability of the light beam, or improve the quality of the light beam. In the solution provided in this application, the optical antenna is mainly used to collimate and appropriately expand the laser beam emitted by the laser module 1 to adapt to subsequent optical processing or measurement. By precisely designing the curvature and position of the spherical mirror, the divergence angle of the light beam is controlled, thereby reducing the angular resolution. By optimizing the design of the optical antenna, unnecessary stray light is reduced, and the signal-to-noise ratio of the system is improved.

[0042] The design and material selection of the optical antenna are crucial for achieving a high-performance optical system. In the above configuration, the materials and coatings of the first spherical mirror 31, the second spherical mirror 32, and the third spherical mirror 33 are carefully selected to ensure high transmittance and low reflection loss of the light beam, thereby improving the performance of the entire optical system. Specifically, in some embodiments, the optical antenna includes a first spherical mirror, a second spherical mirror, and a third spherical mirror, and each device is arranged in sequence along the propagation direction of the output light beam and their central axes coincide.

[0043] Specifically, the first spherical mirror is located after the laser module and the small aperture diaphragm. It is the first element in the optical antenna and is used to receive the light beam from the laser, perform preliminary collimation and focusing on it, and prepare for subsequent beam shaping.

[0044] The second spherical mirror is located after the first spherical mirror. It is the second element in the optical antenna and is used to further adjust the direction and shape of the light beam, and may be used to expand or focus the light beam to meet specific application requirements.

[0045] The third spherical mirror is located after the second spherical mirror. It is the last element in the optical antenna and is used to finally adjust the divergence angle and focusing characteristics of the light beam to ensure that the light beam can be projected onto the target to be measured with the required characteristics.

[0046] The setting with the central axes coinciding means that the central axes of all spherical mirrors must be strictly aligned to ensure that the light beam remains coaxial when passing through the entire optical antenna, reducing aberration and distortion.

[0047] The sequential setting means that the spherical mirrors are arranged in sequence along the propagation direction of the light beam to ensure that the light beam can continuously pass through each element to achieve the required optical effect.

[0048] In practical applications, the specific structure of the optical antenna can be adjusted based on actual needs.

[0049] Specifically, in some embodiments, the side of the first spherical mirror close to the laser is recessed inward to form a first arc surface;

[0050] The side of the second spherical mirror far from the first spherical mirror is recessed inward to form a second arc surface;

[0051] The side of the third spherical mirror far from the second spherical mirror extends outward to form a third arc surface.

[0052] With such a setting, the spherical mirror on the side of the first spherical mirror close to the laser is recessed inward to form a concave surface (i.e., the first arc surface). A concave mirror can converge light and focus the light beam emitted by the laser toward the central axis direction, providing a basis for subsequent beam shaping and collimation.

[0053] The side of the second spherical mirror adjacent to the first spherical mirror is also concave inward, forming a second arc surface. The second spherical mirror continues to adjust the light beam, which may further focus it or change the propagation direction of the light beam according to design requirements.

[0054] The side of the third spherical mirror adjacent to the second spherical mirror extends outward to form a convex surface (i.e., the third arc surface). A convex mirror can diverge light, which helps to adjust the divergence angle of the light beam and ensure that the light beam is projected onto the target to be measured at the desired angle.

[0055] In some embodiments, the wavelength of the laser module is 1535 nm, the output energy is greater than 200 μJ, the beam diameter is 0.3 mm, and the inner diameter of the small aperture diaphragm is 0.26 mm. Specifically, the laser module is the core light source of the system, and its parameters are crucial for the performance of the entire system.

[0056] Laser module parameters

[0057] Wavelength: The wavelength of the laser module is 1535 nanometers (nm), which is an infrared wavelength in the optical fiber communication window and is commonly used for long-distance communication and precise measurement.

[0058] Output energy: The output energy of the laser is greater than 200 microjoules (μJ), which indicates that the laser can provide sufficient energy for effective measurement or processing.

[0059] Beam diameter: The beam diameter is 0.3 millimeters (mm), which is the physical size of the laser output beam and affects the divergence angle and focusing ability of the beam.

[0060] Small aperture diaphragm parameters

[0061] Inner diameter: The inner diameter of the small aperture diaphragm is 0.26 millimeters (mm), which is smaller than the beam diameter of the laser and is used to limit the edge part of the beam.

[0062] Function: The small aperture diaphragm is placed between the laser and the optical antenna. Its main function is to limit the edge beam beyond the 1 / e2 of the beam energy, thereby controlling the divergence angle of the beam and improving the angular resolution.

[0063] The combined use of such a laser module and a small aperture diaphragm provides an effective method for the optical system to reduce the angular resolution and improve the measurement accuracy. At the same time, by controlling the quality and characteristics of the light beam, the overall performance of the system is enhanced.

[0064] Specifically, the outer diameter of the first spherical mirror is 8 mm;

[0065] The radius of curvature of the first side (i.e., the first arc surface) of the first spherical mirror is 4.733 mm - 5.733 mm;

[0066] The second side of the first spherical mirror is a plane; that is, the radius of curvature = ∞;

[0067] The central thickness of the first spherical mirror is 1.9 mm - 2.1 mm;

[0068] The outer diameter of the second spherical mirror is 8 mm;

[0069] The first side of the second spherical mirror is a plane; that is, the radius of curvature = ∞;

[0070] The radius of curvature of the second spherical mirror (i.e., the second arc surface) is 5.086 mm - 6.0586 mm;

[0071] The central thickness of the second spherical mirror is 1.9 mm - 2.1 mm;

[0072] The outer diameter of the third spherical mirror is 8 mm;

[0073] The first side of the third spherical mirror is a plane; that is, the radius of curvature = ∞;

[0074] The radius of curvature of the second side of the third spherical mirror (i.e., the third arc surface) is 19.655 mm - 20.655 mm;

[0075] The central thickness of the third spherical mirror is 2.4 mm - 2.6 mm.

[0076] Actually, the outer diameter refers to the diameter of the spherical mirror, that is, the distance between the outermost edges of the mirror surface. In an optical system, the outer diameter is one of the important parameters for determining the size of an optical element, and it affects the physical size of the optical element and the coverage range of the light beam on it.

[0077] The central thickness refers to the thickness at the center of the spherical mirror, that is, the thickness at the central axis. This is an important parameter because it affects the focusing ability, pressure resistance, and optical performance of the optical element.

[0078] In some embodiments, the material of the first spherical mirror is H-K9L; the material of the second spherical mirror is H-ZF6; the material of the third spherical mirror is H-K9L.

[0079] In an optical system, choosing the appropriate material is crucial for ensuring the performance of the optical element. The choice of material affects the refractive index, dispersion, transmittance, thermal stability, mechanical strength, and chemical resistance of the optical element, etc. According to the information you provided, the following materials are used for the three spherical mirrors:

[0080] First spherical mirror: Material: H-K9L Description: H-K9L is a high-performance optical glass with low dispersion and good optical uniformity. It is usually used in optical systems requiring high precision and high transmittance.

[0081] Second spherical mirror: Material: H-ZF6 Description: H-ZF6 is also an optical glass with different physical and optical properties from H-K9L. Specific properties depend on the manufacturer's formulation and process, but generally it has good optical performance.

[0082] Third spherical mirror: Material: H-K9L Description: The same as the first spherical mirror, using H-K9L material to maintain the performance consistency of the same material in the entire optical system.

[0083] Specifically, both sides of the first spherical mirror, the second spherical mirror and the third spherical mirror need to be coated with an antireflection film in the wavelength range of 1530nm - 1540nm.

[0084] The functions of the antireflection film include: Reducing reflection: By reducing the reflection of light beams on the optical surface, the antireflection film helps more light energy to pass through the component rather than being reflected. Improving transmittance: Improving the transmittance in a specific wavelength band is crucial for ensuring the performance of the laser system at the designed wavelength. Reducing stray light: Reducing reflection also helps to reduce the stray light caused by reflection and improve the signal-to-noise ratio of the system.

[0085] Coating is an important step in the manufacturing process of optical components, especially in applications that require high transmittance in a specific wavelength range. In this application, both sides of the first spherical mirror, the second spherical mirror and the third spherical mirror need to be coated with an antireflection film in a specific wavelength band. The specific information is as follows: The antireflection film is designed for the wavelength band of 15,30nm to 1540nm, which is usually used for long-distance optical communication and precision optical measurement. The purpose of the antireflection film is to improve the laser energy transmittance of the optical component in this wavelength band, reduce the reflection loss of the light beam on the surface of the component, and thus improve the overall efficiency and performance of the optical system.

[0086] In the solution provided by this application, by adding a small aperture stop, the angular resolution can be effectively reduced. Taking the optical configuration with a divergence angle of 1.0mrad as an example, using this optical configuration system, the angular resolution can be reduced from 1.8mrad to 1.3mrad.

[0087] Furthermore, only by adding a small aperture stop to achieve the purpose of reducing the angular resolution, the length only increases by 0.5mm, while using the conventional method of reducing the angular resolution, the length of the optical configuration needs to increase by 12mm;

[0088] Furthermore, the stray light of the optical system is effectively reduced. Using this optical configuration, the stray light angle is reduced from 1.8mrad to 1.3mrad, effectively avoiding interference with other systems.

[0089] Further, the wavelength of the laser module is 1535 nm, the output energy is greater than 200 μJ, the beam diameter is 0.3 mm, and the inner diameter of the small aperture diaphragm is 0.26 mm. The beam of the laser beyond the 1 / e2 point is restricted to achieve the purpose of reducing the angular resolution.

[0090] It should be noted that the terms "first", "second", etc. described in this article do not limit the specific order, but are only used to distinguish each component or function.

[0091] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of them should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

[0092] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be seen in the same or similar content of other embodiments.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. An optical configuration with low angular resolution, characterized in that, It includes a laser module, a pinhole aperture, and an optical antenna that are coaxially arranged; The pinhole aperture is placed between the laser and the optical antenna; The optical antenna includes a first spherical mirror, a second spherical mirror, and a third spherical mirror. Each device is arranged in sequence along the propagation direction of the output beam and their central axes coincide; The side of the first spherical mirror close to the laser is recessed inward to form a first arc surface; The side of the second spherical mirror away from the first spherical mirror is recessed inward to form a second arc surface; The side of the third spherical mirror away from the second spherical mirror extends outward to form a third arc surface.

2. The optical configuration with low angular resolution according to claim 1, characterized in that, The wavelength of the laser module is 1535 nm, the output energy is greater than 200 μJ, the beam diameter is 0.3 mm, and the inner diameter of the pinhole aperture is 0.26 mm.

3. The optical configuration with low angular resolution according to claim 1, characterized in that: The outer diameter of the first spherical mirror is 8 mm; The radius of curvature of the first arc surface is 4.733 mm - 5.733 mm; The central thickness of the first spherical mirror is 1.9 mm - 2.1 mm; The outer diameter of the second spherical mirror is 8 mm; The radius of curvature of the second arc surface is 5.086 mm - 6.0586 mm; The central thickness of the second spherical mirror is 1.9 mm - 2.1 mm; The outer diameter of the third spherical mirror is 8 mm; The radius of curvature of the third arc surface is 19.655 mm - 20.655 mm; The central thickness of the third spherical mirror is 2.4 mm - 2.6 mm.

4. The optical configuration with low angular resolution according to claim 1, characterized in that, The material of the first spherical mirror is H-K9L; The material of the second spherical mirror is H-ZF6; The material of the third spherical mirror is H-K9L.

5. The optical configuration with low angular resolution according to claim 1, characterized in that Both sides of the first spherical mirror, the second spherical mirror, and the third spherical mirror need to be coated with an antireflection film in the wavelength band of 1530 nm to 1540 nm.

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