Optical lenses for near-infrared laser focusing

Abstract

The present invention discloses an optical lens for near-infrared laser focusing, comprising a lens body, wherein the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are coaxially arranged in sequence along the incident direction of the light beam. The first lens is configured as a biconcave lens, the second lens and the seventh lens are configured as plano-concave lenses, the object side surface of the second lens is concave, the image side surface of the seventh lens is concave, the third lens, the fourth lens, the fifth lens, and the sixth lens are configured as plano-convex lenses, the image side surfaces of the third lens and the fourth lens are convex, the object side surfaces of the fifth lens and the sixth lens are convex, and the eighth lens is a window mirror. The optical lens has a simple structure, effectively solves aberration problems, and ensures scanning and cutting accuracy, ensuring surgical results and improving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a standardized optical lens for near-infrared laser focusing. Background Art

[0002] In recent years, optical technology has advanced rapidly, and the application of laser lenses in clinical medicine and scientific research has become increasingly widespread. In industry and technology, laser lenses are core components in processes such as laser printing, laser cutting, and optical communications. Their precise beam guidance capabilities significantly improve production and transmission efficiency. In clinical medicine, laser lenses play an irreplaceable role. For example, laser corneal refractive flap surgery for myopia places extremely high demands on laser lens performance. To enhance surgical precision, surgeons typically choose laser focusing lenses with a small focal spot and a reasonable scanning range. These lenses enable precise scanning and cutting within a very small area, minimizing damage to surrounding tissue. However, due to current technological limitations, some laser lenses suffer from suboptimal focusing. Aberrations can reduce beam spot quality, affecting not only the corneal cutting range during surgery but also the accuracy of the scanning and cutting process, ultimately impacting surgical effectiveness and safety. Therefore, developing higher-performance, low-aberration laser lenses is crucial for advancing laser medical technology. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides an optical lens for near-infrared laser focusing, which has a simple structure, effectively solves the aberration problem, and ensures scanning and cutting accuracy, ensures surgical results and improves safety.

[0004] To achieve the above-mentioned objectives, the present invention provides an optical lens for near-infrared laser focusing, comprising a lens body, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens coaxially arranged in sequence along the incident direction of the light beam in the lens, the first lens being configured as a biconcave lens, the second lens and the seventh lens being configured as plano-concave lenses, the object side surface of the second lens being concave, the image side surface of the seventh lens being concave, the third lens, the fourth lens, the fifth lens and the sixth lens being configured as plano-convex lenses, the image side surfaces of the third lens and the fourth lens being convex, the object side surfaces of the fifth lens and the sixth lens being convex, and the eighth lens being a window mirror.

[0005] This advantageous arrangement results in: This lens consists of a body and eight lenses arranged coaxially along the incident beam direction. The first lens is a biconcave lens, which expands the incident beam into a larger beam; the second lens is a plano-concave lens, which expands the beam into a larger beam; the third lens is a plano-convex lens, which expands the beam during deflection; the fourth lens is a plano-convex lens, which converges the beam into a parallel beam; the fifth lens is a plano-convex lens, which diverges the light and adjusts the focal length; the sixth lens is a plano-convex lens, which focuses the light and adjusts the focal length; the seventh lens is a plano-concave lens, which converges the light; and the eighth lens is a window lens, which transmits the light. This arrangement significantly reduces costs and improves performance. From a processing and assembly perspective, this lens significantly reduces manufacturing difficulty and cost. The lens types are simple and clear, and the combination of biconcave, plano-concave, and plano-convex lenses reduces the need for machining complex curved surfaces. This design also facilitates assembly and debugging, reducing the technical requirements and time costs during the production process. Regarding optical performance, the distances between the lenses are carefully designed to ensure ample space for light to spread between them. The third through sixth lenses are plano-convex lenses, combined with biconcave and plano-concave lenses, effectively guiding and focusing light, reducing aberrations such as high-order spherical aberration and coma, significantly improving image quality and stability. The lens structure, with a wavelength range of 1030nm, enables laser scanning with a focused beam spot within a 9mm diameter. By rationally adjusting the optical path of the lens assembly, this lens achieves excellent beam spot performance, with laser energy at the center of the spot reaching up to 80% of the total incident energy, significantly improving laser energy utilization. For example, in laser cutting and scanning applications, the high energy density beam spot enables more precise processing. Compared to traditional lenses, this lens effectively addresses the issue of low energy density, achieving higher precision within the cutting scanning range and meeting the stringent requirements of high-precision processing. In near-infrared imaging systems, this lens, with its low aberration and high energy utilization, ensures image clarity and stability. This not only improves overall system performance but also enables the miniaturization and lightweight design of related equipment, further expanding the application of near-infrared laser technology in industrial manufacturing, medical treatment, scientific research, and other fields.

[0006] As a further configuration of the present invention, the entrance pupil diameter of the lens body is 20 mm, the effective focal length of the lens body is 50.8 mm, and the F number of the lens body is 2.5.

[0007] The beneficial effects of such a setting are: reasonable structural arrangement, ensuring the use effect of the lens, ensuring the convergence effect of laser energy, improving the use reliability of the structure, and having a good use effect.

[0008] As a further configuration of the present invention, the field of view angle of the mirror body is 5°.

[0009] The beneficial effect of this setting is that it can focus the light in a specific area more concentratedly, reduce the incidence of edge light, thereby reducing the impact of aberration and distortion, and at the same time concentrate more laser energy in a smaller field of view, which is beneficial to increase the proportion of laser energy in the center of the spot.

[0010] As a further configuration of the present invention, the total system length of the mirror body is 456.5 mm.

[0011] The beneficial effects of such arrangement are: the overall structure is compact, the use effect is guaranteed, the function is stable, and good use effect is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the layout structure of the optical lens according to an embodiment of the present invention;

[0013] Figure 2 This is a spot diagram of the field of view of an embodiment of the present invention when the object plane is 0°;

[0014] Figure 3 This is a spot diagram of the field of view of an embodiment of the present invention at 1.5° to the object plane;

[0015] Figure 4 This is a spot diagram of the field of view of an embodiment of the present invention at an object plane angle of 2.5°;

[0016] Figure 5 This is a spot diagram of the field of view of an embodiment of the present invention at 3° to the object plane;

[0017] Figure 6 This is a spot diagram of the field of view of an embodiment of the present invention when the object plane is 5°;

[0018] Figure 7 The geometrically enclosed energy diagram of the optical path design in an embodiment of the present invention;

[0019] Figure 8 A field curvature diagram of the optical path design in an embodiment of the present invention;

[0020] Figure 9 This is a distortion diagram of the optical path design in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention provides an embodiment of an optical lens for near-infrared laser focusing. Figure 1 and Figure 9As shown, it includes a lens body, in which the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are coaxially arranged in sequence along the incident direction of the light beam. The first lens L1 is configured as a biconcave lens, the second lens L2 and the seventh lens L7 are configured as plano-concave lenses, the object side surface of the second lens L2 is concave, the image side surface of the seventh lens L7 is concave, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are configured as plano-convex lenses, the image side surfaces of the third lens L3 and the fourth lens L4 are convex, the object side surfaces of the fifth lens L5 and the sixth lens L6 are convex, and the eighth lens L8 is a window mirror. This lens consists of a mirror body and eight lenses arranged coaxially along the incident direction of the light beam. The first lens, L1, is a biconcave lens, which expands the incident light beam into a larger beam. The second lens, L2, is a plano-concave lens, which expands the light beam into a larger beam. The third lens, L3, is a plano-convex lens, which expands the beam during deflection. The fourth lens, L4, is a plano-convex lens, which converges the light beam into a parallel beam. The fifth lens, L5, is a plano-convex lens, which diverges the light and adjusts the focal length. The sixth lens, L6, is a plano-convex lens, which focuses the light and adjusts the focal length. The seventh lens, L7, is a plano-concave lens, which converges the light. The eighth lens, L8, is a window lens, which transmits the light. This arrangement significantly reduces costs and improves performance. From a processing and assembly perspective, this lens significantly reduces manufacturing difficulty and cost. The lens types are simple and clear, and the combination of biconcave, plano-concave, and plano-convex reduces the need for machining complex curved surfaces. This design also facilitates assembly and debugging, reducing the technical barriers and time costs during the production process. In terms of optical performance, the distance between the lenses is carefully designed to ensure ample space for light to spread between them. Lenses L6 through L7 are plano-convex lenses, combined with biconcave and plano-concave lenses. These lenses effectively guide and focus light, reducing aberrations such as high-order spherical aberration and coma, significantly improving image quality and stability. The lens structure, with a wavelength range of 1030nm, enables laser scanning with a focused beam within a 9mm diameter. By rationally adjusting the optical path of the lens array, this lens achieves excellent beam performance, with the laser energy at the center of the beam reaching up to 80% of the total incident energy, significantly improving laser energy utilization. For example, in laser cutting and scanning applications, the high energy density beam enables more precise processing. Compared to traditional lenses, this lens effectively addresses the issue of low energy density, achieving higher precision within the cutting scanning range and meeting the stringent requirements of high-precision processing. In near-infrared imaging systems, this lens, with its low aberration and high energy utilization, ensures image clarity and stability. This not only improves overall system performance but also enables the miniaturization and lightweight design of related equipment, further expanding the application of near-infrared laser technology in industrial manufacturing, medical treatment, scientific research, and other fields.

[0022] As a further configuration of this embodiment, the lens has an entrance pupil diameter of 20 mm, an effective focal length of 50.8 mm, and an F-number of 2.5. This configuration has the beneficial effects of a reasonable structural arrangement, ensuring the effectiveness of the lens, ensuring the convergence of laser energy, improving the reliability of the structure, and achieving good performance.

[0023] As a further feature of this embodiment, the lens has a field of view of 5°. This configuration has the beneficial effect of more closely focusing light in a specific area, reducing the incidence of peripheral light, thereby reducing the effects of aberration and distortion. It also allows more laser energy to be concentrated within a smaller field of view, thereby increasing the proportion of laser energy in the center of the spot.

[0024] As a further configuration of this embodiment, the total length of the mirror body is 456.5 mm. The beneficial effects of this configuration are: the overall structural design is reasonable, the use effect is guaranteed, the function is stable, and the use effect is good.

[0025] The relevant parameters of each lens in the optical lens provided in this embodiment are shown in Table 1:

[0026]

[0027] like Figures 2 to 6 As shown in the figure, the focus spot of the diffuse spot array is about 3.2um, and the root mean square radius is 3.6um, which can realize laser scanning of the focus spot within the range of 9mm diameter.

[0028] like Figure 7 As shown, it can be achieved that under a certain oblique incidence, the spot radius of each field angle can be guaranteed to be within the required range, the geometrically enclosed energy reaches 80%, and is less than the diffraction limit.

[0029] like Figure 8 and Figure 9 As shown, it is a field curvature / distortion diagram of the embodiment, where the sagittal field curvature is 0.0434mm and the meridional field curvature is 0.0876mm relative to the wavelength; the maximum field distortion is less than 0.3939%, which has the design feature of low distortion.

[0030] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. An optical lens for near-infrared laser focusing, characterized by: The invention comprises a lens body, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are coaxially arranged in sequence along the incident direction of the light beam, the first lens is configured as a biconcave lens, the second lens and the seventh lens are configured as plano-concave lenses, the image side surface of the second lens is concave, the object side surface of the seventh lens is concave, the third lens, the fourth lens, the fifth lens and the sixth lens are configured as plano-convex lenses, the image side surfaces of the third lens and the fourth lens are convex, the object side surfaces of the fifth lens and the sixth lens are convex, and the eighth lens is a window mirror.

2. The optical lens for near-infrared laser focusing according to claim 1, characterized in that: The entrance pupil diameter of the lens body is 20 mm, the effective focal length of the lens body is 50.8 mm, and the F number of the lens body is 2.

5.

3. The optical lens for near-infrared laser focusing according to claim 1, characterized in that: The field of view angle of the mirror body is 5°.

4. The optical lens for near-infrared laser focusing according to claim 1, characterized in that: The total system length of the mirror body is 456.5 mm.

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