High-integration-level far infrared optical system and high-integration-level far infrared optical lens

Abstract

The utility model discloses a high-integration-level far-infrared optical system and a high-integration-level far-infrared optical lens. The high-integration-level far-infrared optical system sequentially comprises a refraction lens and a combined lens from an object side to an image side along an optical axis. The refractive lens has positive focal power, and the object side surface and the image side surface of the refractive lens both protrude towards the object side. The focal power of the combined lens is positive, the combined lens comprises a lens body and a micro-nano structure array, the lens body comprises a first surface and a second surface which are located on the object side face and the image side face of the lens body respectively, the micro-nano structure array is arranged on any one of the first surface and the second surface, and the other one of the first surface and the second surface is a curved surface. According to the combined lens, broadband spectrum achromatism can be achieved, aberration of the far-infrared optical system can be corrected, due to the fact that the combined lens has the high integration level, the high-integration-level far-infrared optical system still has the excellent imaging quality while the number of lenses used by the high-integration-level far-infrared optical system is small, and the cost and the size of the system can be further reduced.

Description

Technical Field

[0001] This application relates to the field of far-infrared optical systems, and more particularly to a highly integrated far-infrared optical system and a highly integrated far-infrared optical lens. Background Technology

[0002] In the prior art, the imaging quality of far-infrared optical systems is usually positively correlated with cost. In the field of far-infrared optical systems, in order to obtain excellent imaging quality, the following methods are usually adopted: (1) Using lenses made of materials with excellent optical properties to reduce chromatic aberration and spherical aberration, but the cost of materials with excellent optical properties is usually high, resulting in a high cost of optical systems. (2) Increasing the number of lenses or lens groups to correct various aberrations, such as chromatic aberration, distortion, field curvature, etc., to improve imaging quality. Increasing the number of lenses will lead to a significant increase in cost and volume, and increasing the number of lenses will lead to a significant increase in assembly and calibration difficulty. (3) Using a large number of aspherical lenses to effectively reduce aberrations, but aspherical lenses are more difficult to process, which will also increase costs.

[0003] Existing far-infrared optical systems typically cannot simultaneously achieve low cost and high image quality, yet cost and image quality are crucial factors for the large-scale application of far-infrared optical systems. In a highly competitive environment, there is an urgent need for a far-infrared optical system that is smaller, lower cost, and possesses excellent optical performance. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a highly integrated far-infrared optical system and a highly integrated far-infrared optical lens, aiming to provide a far-infrared optical system that is small in size, low in cost, and has excellent optical performance.

[0005] According to one aspect of the embodiments of this application, a highly integrated far-infrared optical system is disclosed, comprising, along the optical axis from the object side to the image side, a refractive lens and a combined lens;

[0006] The optical power of the refractive lens is positive, the object-side surface of the refractive lens is convex to the object side, and the image-side surface of the refractive lens is convex to the object side;

[0007] The combined lens has a positive optical power. The combined lens includes a lens body and a micro / nano structure array. The lens body includes a first surface and a second surface. The first surface is located on the object side of the lens body, and the second surface is located on the image side of the lens body. The micro / nano structure array is disposed on either the first surface or the second surface, and the other of the first surface and the second surface is a curved surface.

[0008] In some embodiments, the surface is a sphere or an aspherical surface.

[0009] In some embodiments, the refractive lens is a spherical lens or an aspherical lens.

[0010] In some embodiments, the highly integrated far-infrared optical system satisfies: 0.6mm -1 <n1×(|c1|+|c2|)<1.0mm -1 Wherein, n1 is the refractive index of the refractive lens, c1 is the curvature of the object side of the refractive lens, and c2 is the curvature of the image side of the refractive lens.

[0011] In some embodiments, the highly integrated far-infrared optical system satisfies: Among them, f m is the focal length of the micro-nano structure array of the combined lenses, and f is the effective focal length of the highly integrated far-infrared optical system.

[0012] In some embodiments, the highly integrated far-infrared optical system satisfies: Where f2 is the focal length of the combined lens, and f is the effective focal length of the highly integrated far-infrared optical system.

[0013] In some embodiments, the highly integrated far-infrared optical system satisfies: Wherein, f2 is the focal length of the combined lens, f1 is the focal length of the refractive lens, and f is the effective focal length of the highly integrated far-infrared optical system.

[0014] In some embodiments, the highly integrated far-infrared optical system satisfies: Wherein, L1 is the distance between the object-side surface of the refracting lens and the image-side surface of the combined lens on the optical axis, and TTL is the total optical length of the highly integrated far-infrared optical system.

[0015] In some embodiments, the highly integrated far-infrared optical system satisfies: Wherein, Φ2 is the optical power of the combined lens, T2 is the center thickness of the combined lens, Φ1 is the optical power of the refractive lens, and T1 is the center thickness of the refractive lens.

[0016] In some embodiments, the highly integrated far-infrared optical system satisfies: in, f1 is the average of the focal length of the refractive lens and the focal length of the combined lens, and f2 is the focal length of the refractive lens.

[0017] In some embodiments, the highly integrated far-infrared optical system satisfies: Among them, D max D is the maximum effective diameter of the larger of the maximum effective diameters of the refractive lens and the combined lens.min The maximum effective diameter is the smaller of the maximum effective diameters of the refractive lens and the combined lens.

[0018] A second aspect of this application provides a highly integrated far-infrared optical lens, comprising: an imaging detector and a highly integrated far-infrared optical system as described in any of the preceding claims, wherein the imaging detector is disposed on the image plane of the highly integrated far-infrared optical system.

[0019] The highly integrated far-infrared optical system provided in this application includes a refractive lens and a combined lens. The refractive lens has positive optical power, with its object-side and image-side surfaces convex towards the object side. The combined lens also has positive optical power and includes a lens body and a micro / nano structure array. The lens body includes a first surface and a second surface, with the first surface located on the object-side surface and the second surface located on the image-side surface. The micro / nano structure array is disposed on either the first or second surface, and the other surface is curved. In this application, the combined lens can achieve broadband achromatic correction and aberration correction for the far-infrared optical system, ensuring excellent imaging quality and a small size. Due to the high integration of the combined lens, the highly integrated far-infrared optical system provided in this application uses fewer lenses, which helps to further reduce the cost and size of the highly integrated far-infrared optical system. Attached Figure Description

[0020] The above and other objectives, features and advantages of this application will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram of the architecture layout of a highly integrated far-infrared optical system in one embodiment of this application is shown.

[0022] Figure 2 The diagram shows the phase distribution of the metasurface in a highly integrated far-infrared optical system according to an embodiment of this application.

[0023] Figure 3 The MTF field-of-view curve of a highly integrated far-infrared optical system according to an embodiment of this application is shown.

[0024] Figure 4 A schematic diagram of the architecture layout of a highly integrated far-infrared optical system in one embodiment of this application is shown.

[0025] Figure 5 The diagram shows the phase distribution of the metasurface in a highly integrated far-infrared optical system according to an embodiment of this application.

[0026] Figure 6The MTF field-of-view curve of a highly integrated far-infrared optical system according to an embodiment of this application is shown.

[0027] Figure 7 A schematic diagram of the architecture layout of a highly integrated far-infrared optical system in one embodiment of this application is shown.

[0028] Figure 8 The diagram shows the phase distribution of the metasurface in a highly integrated far-infrared optical system according to an embodiment of this application.

[0029] Figure 9 The MTF field-of-view curve of a highly integrated far-infrared optical system according to an embodiment of this application is shown.

[0030] Figure 10 A schematic diagram of the architecture layout of a highly integrated far-infrared optical system in one embodiment of this application is shown.

[0031] Figure 11 The diagram shows the phase distribution of the metasurface in a highly integrated far-infrared optical system according to an embodiment of this application.

[0032] Figure 12 The MTF field-of-view curve of a highly integrated far-infrared optical system according to an embodiment of this application is shown.

[0033] Figure 13 A schematic diagram of the architecture layout of a highly integrated far-infrared optical system in one embodiment of this application is shown.

[0034] Figure 14 The diagram shows the phase distribution of the metasurface in a highly integrated far-infrared optical system according to an embodiment of this application.

[0035] Figure 15 The diagram shows the phase distribution of the metasurface in a highly integrated far-infrared optical system according to an embodiment of this application.

[0036] Figure 16 The MTF field-of-view curve of a highly integrated far-infrared optical system according to an embodiment of this application is shown.

[0037] Figure Labels

[0038] 100. Highly integrated far-infrared optical system;

[0039] 10. Refractive lens;

[0040] 20. Combined lens; 210. Lens body; 210a. First surface; 210b. Second surface; 220. Micro / nano structure array; 220a. Micro / nano structure;

[0041] 30. Protective glass;

[0042] 40. Object plane; 50. Image plane; 60. Optical axis. Detailed Implementation

[0043] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the description of this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0044] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more exemplary embodiments. Numerous specific details are provided in the following description to give a full understanding of exemplary embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced by omitting one or more of the specific details, or other modules, components, etc., can be employed. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0045] Please see Figure 1 , Figure 1 This diagram illustrates the architectural layout of a highly integrated far-infrared optical system 100 according to an embodiment of this application. The highly integrated far-infrared optical system 100 includes, along the optical axis 60 from the object side to the image side, a refractive lens 10 and a combined lens 20. For ease of description, the surface of each optical element in the highly integrated far-infrared optical system 100 closest to the object side along the optical axis 60 is referred to as the object-side surface of that optical element. Similarly, the surface of each optical element in the highly integrated far-infrared optical system 100 closest to the image side along the optical axis 60 is referred to as the image-side surface of that optical element. For example, the surface of the refractive lens 10 closest to the object side is referred to as the object-side surface of the refractive lens 10, and the surface of the refractive lens 10 closest to the image side is referred to as the image-side surface of the refractive lens 10.

[0046] The optical power of the refracting lens 10 is positive. The object side of the refracting lens 10 is convex to the object side, and the image side of the refracting lens 10 is convex to the object side.

[0047] The combined lens 20 has a positive optical power and includes a lens body 210 and a micro / nano structure array 220. The lens body 210 includes a first surface 210a and a second surface 210b. The first surface 210a is located on the object-side side of the lens body 210, and the second surface 210b is located on the image-side side of the lens body 210. That is, the two surfaces of the lens body 210 along the optical axis 60 from the object-side to the image-side are, in sequence, the first surface 210a and the second surface 210b. The micro / nano structure array 220 is disposed on either the first surface 210a or the second surface 210b, and the other of the first surface 210a and the second surface 210b is a curved surface. For example, the micro / nano structure array 220 is disposed on the first surface 210a, and the second surface 210b is a curved surface. Alternatively, the micro / nano structure array 220 is disposed on the second surface 210b, and the first surface 210a is a curved surface.

[0048] When considering only the side of the combined lens 20 where the micro / nano structure array 220 is located, the micro / nano structure array 220 and the side of the lens body 210 closest to the micro / nano structure array 220 together form a metasurface, and the metasurface formed by the micro / nano structure array 220 and the side of the lens body 210 closest to the micro / nano structure array 220 modulates light. Since the other surface of the combined lens 20 is curved (neither the first surface 210a nor the second surface 210b has the micro / nano structure array 220), the other surface of the combined lens 20 also modulates light.

[0049] The micro / nano structure array 220 is formed by a periodic arrangement of multiple micro / nano structures 220a. The micro / nano structures 220a are subwavelength structures, and their shapes include, but are not limited to, nanocylinders, nanorings, nanopores, and nanorings. Please refer to... Figure 1 , Figure 4 , Figure 7 , Figure 10 and Figure 13 In some architectures, the micro / nano structure 220a is a normal micro / nano structure; please refer to [link / reference]. Figure 14 In some architectures, the 220a micro / nano structure is a negative micro / nano structure. It is worth mentioning that... Figure 13 and Figure 14 The highly integrated far-infrared optical system 100 shown has the same optical performance; the only difference between the two is the micro / nano structure 220a. Specifically, Figure 13 The micro / nano structure 220a in the highly integrated far-infrared optical system 100 shown is a positive micro / nano structure. Figure 14The micro / nano structure 220a in the highly integrated far-infrared optical system 100 shown is a negative micro / nano structure. That is, for any highly integrated far-infrared optical system 100, it can be implemented using either a positive or negative micro / nano structure. It is understood that the micro / nano structure 220a shown in the figures of this application is for illustration only and does not constitute a limitation on the positive or negative sign, shape, characteristic size, period, or other parameters of the micro / nano structure 220a. As long as the configured micro / nano structure 220a has the optical performance that meets the target, it is acceptable.

[0050] Because the micro-nano structure array 220 of the combined lens 20 has a high degree of design freedom, the combined lens 20 itself also has a high degree of design freedom, meaning that the design of the combined lens 20 has more choices and flexibility. Integrating the micro-nano structure array 220 onto the lens body 210 allows the combined lens 20 to have a high degree of integration while meeting the expected optical performance, which helps to reduce the cost of the highly integrated far-infrared optical system 100. Since the micro-nano structure array 220 can provide different optical powers for incident light of different wavelengths, broadband achromaticity can be achieved by reasonably configuring the various parameters of the micro-nano structure. At the same time, the optical power of the combined lens 20 at each wavelength can be used to correct the aberrations of the highly integrated far-infrared optical system 100, ensuring that the highly integrated far-infrared optical system 100 has excellent imaging quality.

[0051] The highly integrated far-infrared optical system 100 provided in this application includes a refractive lens 10 and a composite lens 20. The composite lens 20 can achieve broadband achromatic correction and correct aberrations in the highly integrated far-infrared optical system 100, ensuring that the highly integrated far-infrared optical system 100 has excellent imaging quality and a small size. Due to the high integration of the composite lens 20, the highly integrated far-infrared optical system 100 provided in this application uses fewer lenses, which is beneficial to further reducing the cost and size of the highly integrated far-infrared optical system 100.

[0052] In some embodiments, the micro / nano structure array 220 is disposed on either the first surface 210a or the second surface 210b, and the other of the first surface 210a and the second surface 210b is a curved surface that convexes toward the object side.

[0053] In some embodiments, the micro / nano structure array 220 is disposed on either the first surface 210a or the second surface 210b, and the other of the first surface 210a and the second surface 210b is a curved surface that convexes toward the image side.

[0054] In some embodiments, the micro-nano structure array 220 is disposed on either the first surface 210a or the second surface 210b, and the other of the first surface 210a and the second surface 210b is a curved surface, which is a spherical surface. In this case, the combined lens has the advantages of low processing cost and good processability.

[0055] In some embodiments, the micro-nano structure array 220 is disposed on either the first surface 210a or the second surface 210b, and the other of the first surface 210a and the second surface 210b is a curved surface, which is an aspherical surface. In this case, the combined lens has better optical performance and can fully correct the aberrations of the highly integrated far-infrared optical system 100.

[0056] In some embodiments, the micro-nano structure array 220 is disposed on either the first surface 210a or the second surface 210b, and the surface of the micro-nano structure array 220 is set to be planar, thereby reducing the fabrication difficulty of the micro-nano structure array 220.

[0057] In one specific embodiment, the micro / nano structure array 220 is disposed on the first surface 210a, the second surface 210b is curved, and the second surface 210b is aspherical.

[0058] In some embodiments, a micro / nano structure is fabricated on one surface of a blank (including but not limited to a planar lens) using semiconductor processes to obtain a micro / nano structure array 220. Then, the surface opposite to the surface containing the micro / nano structure array 220 is further processed using methods including but not limited to molding, single-point machining, and photolithography, to give the surface opposite the surface containing the micro / nano structure array 220 a target curvature, thus obtaining a combined lens 20. It is understood that when the lens body 210 and the micro / nano structure are made of the same material, the lens body 210 and the micro / nano structure are integrally formed.

[0059] In some embodiments, a micro / nano structure array 220 is fabricated on a wafer to obtain a superlens. A separate lens body 210 is also fabricated, and the superlens and lens body 210 are bonded together to obtain a combined lens 20.

[0060] In some embodiments, the refractive lens 10 is a spherical lens, which can further reduce the cost of the highly integrated far-infrared optical system 100.

[0061] In some embodiments, the refractive lens 10 is an aspherical lens. In this case, the highly integrated far-infrared optical system 100 has better performance in aberration control, which can enable the highly integrated far-infrared optical system 100 to have better imaging quality.

[0062] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition one: 0.6mm -1 <n1×(|c1|+|c2|)<1.0mm -1 Where n1 is the refractive index of the refractive lens 10 under light with a wavelength of 10.6 micrometers, c1 is the curvature of the object-side surface of the refractive lens 10, and c2 is the curvature of the image-side surface of the refractive lens 10. The dimensions of c1 and c2 are both negative powers of the unit of length, for example, mm. -1 .

[0063] In this application, the refractive lens 10 has an overall meniscus shape convex towards the object side, and its optical power is positive. Condition 1 reflects the light-diverging capability of the refractive lens 10. The lower limit of Condition 1 ensures that when the refractive index of the refractive lens 10 is small, the absolute value of its optical power still meets expectations. The upper limit of Condition 1 ensures that when the refractive index of the refractive lens 10 is large, the curvature of the refractive lens 10 will not be excessive, thus ensuring that the refractive lens 10 has good manufacturability.

[0064] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition two: Among them, f m The focal length of the micro / nano structure array 220 of the combined lens 20, i.e., f m f is the focal length of the metasurface formed by the micro / nano structure array 220 and the lens body 210. f is the effective focal length of the highly integrated far-infrared optical system 100. m Both f and are units of length, such as millimeters.

[0065] Equation 2 reflects the focal length proportion undertaken by the micro / nano structure array 220 in the highly integrated far-infrared optical system 100; that is, Equation 2 reflects the contribution of the micro / nano structure array 220 in focusing. The lower limit of Equation 2 represents the maximum light focusing capability that the micro / nano structure array 220 can provide in the highly integrated far-infrared optical system 100, while the upper limit of Equation 2 represents the minimum light focusing capability that the micro / nano structure array 220 needs to provide in the highly integrated far-infrared optical system 100.

[0066] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition three: Where f2 is the focal length of the combined lens 20, and f is the effective focal length of the highly integrated far-infrared optical system 100. Both f2 and f have the same dimension, being units of length, such as millimeters.

[0067] Condition 3 reflects the focal length proportion undertaken by the combined lens 20 in the highly integrated far-infrared optical system 100, which embodies the role of the combined lens 20 in focusing. The lower limit of Condition 3 represents the maximum light focusing capability that the combined lens 20 can provide in the highly integrated far-infrared optical system 100, while the upper limit of Condition 3 represents the minimum light converging capability that the combined lens 20 needs to provide in the highly integrated far-infrared optical system 100.

[0068] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition four: Where f2 is the focal length of the combined lens 20, f1 is the focal length of the refracting lens 10, and f is the effective focal length of the highly integrated far-infrared optical system 100. f2, f1, and f have the same dimension, all being units of length, such as millimeters.

[0069] Equation 4 reflects the focal length distribution of the combined lens 20 and the refractive lens 10 in the highly integrated far-infrared optical system 100. Since lenses with smaller focal lengths are more sensitive to tolerances, a reasonable focal length distribution helps to increase the assembly difficulty of the highly integrated far-infrared optical system 100 and improves the assembly yield. The lower limit of Equation 4 represents the most even focal length distribution of the combined lens 20 and the refractive lens 10 in the highly integrated far-infrared optical system 100, while the upper limit represents the case where the focal length distribution of the combined lens 20 and the refractive lens 10 differs the most.

[0070] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition five: Where L1 is the distance on the optical axis 60 between the object-side surface of the refracting lens 10 and the image-side surface of the combined lens 20, and TTL is the total optical length of the highly integrated far-infrared optical system 100. L1 and TTL have the same dimensions and are both units of length, such as millimeters.

[0071] In the highly integrated far-infrared optical system 100, the distance L1 between the object-side surface of the refractive lens 10 and the image-side surface of the combined lens 20 on the optical axis 60 directly affects the mechanical length of the lens corresponding to the highly integrated far-infrared optical system 100. The lower limit of conditional expression five represents the minimum length ratio of the distance L1 between the object-side surface of the refractive lens 10 and the image-side surface of the combined lens 20 on the optical axis 60 in the lens corresponding to the highly integrated far-infrared optical system 100; that is, the lower limit of conditional expression five represents the limit to compressing the mechanical length of the lens corresponding to the highly integrated far-infrared optical system 100. The lower limit of conditional expression five also represents the maximum length ratio of the distance L1 between the object-side surface of the refractive lens 10 and the image-side surface of the combined lens 20 on the optical axis 60 in the lens corresponding to the highly integrated far-infrared optical system 100.

[0072] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition six: Where Φ2 represents the optical power of the combined lens 20, and Φ1 represents the optical power of the refractive lens 10. The units for Φ2 and Φ1 are D (Dioptre, abbreviated as D, diopter), where D = m -1 T2 is the center thickness of the composite lens 20, that is, T2 is the thickness of the composite lens 20 on the optical axis 60. T1 is the center thickness of the refractive lens 10, that is, T1 is the thickness of the refractive lens 10 on the optical axis 60. T2 and T1 have the same dimension, both being units of length, such as millimeters.

[0073] Condition 6 reflects the difference between the ratio of optical power to center thickness of the combined lens 20 and the ratio of optical power to center thickness of the refractive lens 10. Condition 6 demonstrates the thickness advantage of the combined lens 20 and conventional lenses in providing the same optical power within the same highly integrated far-infrared optical system 100; specifically, the combined lens has a smaller thickness while providing the same optical power. The lower limit of Condition 6 represents the case where the difference between the ratio of optical power to center thickness of the combined lens 20 and the ratio of optical power to center thickness of the refractive lens 10 is the smallest in the highly integrated far-infrared optical system 100, while the upper limit of Condition 6 represents the case where the difference between the ratio of optical power to center thickness of the combined lens 20 and the ratio of optical power to center thickness of the refractive lens 10 is the largest in the highly integrated far-infrared optical system 100.

[0074] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition seven: in, This is the average of the focal lengths of the refracting lens and the combined lens. When i = 1, f i =f1, where f1 is the focal length of the refracting lens; when i = 2, f i =f2, where f2 is the focal length of the combined lens. f1, f2, They have the same dimensions, both being units of length, such as millimeters.

[0075] Condition 7 reflects the uniformity of focal length distribution among the lenses in the highly integrated far-infrared optical system 100. Uneven focal length distribution can easily lead to problems such as lens manufacturability and tolerance sensitivity. The upper limit of Condition 7 represents the maximum tolerable uneven focal length distribution in the highly integrated far-infrared optical system 100, while the lower limit represents the optimal uniformity of focal length distribution that the highly integrated far-infrared optical system 100 can provide. At this point, the lenses in the highly integrated far-infrared optical system 100 have the advantages of good manufacturability and tolerance sensitivity, which can reduce the tolerance requirements during installation.

[0076] In some embodiments, the highly integrated far-infrared optical system 100 satisfies condition eight: Among them, D max D is the maximum effective diameter of the larger of the refracting lens and the combined lens. min The maximum effective diameter is the smaller of the maximum effective diameters of the refractive lens and the combined lens. In this application, the maximum effective diameter of a certain lens is the larger of the maximum light-transmitting area diameter on the object side of the corresponding lens and the maximum light-transmitting area diameter on the image side of the corresponding lens. For example, if the maximum light-transmitting area diameter on the object side of the refractive lens 10 is a mm and the maximum light-transmitting area diameter on the object side of the image side of the refractive lens 10 is b mm, and a is greater than b, then the maximum effective diameter of the refractive lens 10 is a mm. max D min They have the same dimensions, both being units of length, such as millimeters.

[0077] When a light beam is incident on the highly integrated far-infrared optical system 100, its diameter changes as the light propagates. A larger value for conditional equation eight results in a more drastic change in beam diameter, which can easily lead to tolerance sensitivity and stray light issues. Therefore, the value of conditional equation eight can indirectly reflect the actual performance of the highly integrated far-infrared optical system 100. The upper limit of conditional equation eight represents the maximum allowable diameter change of the highly integrated far-infrared optical system 100, while the lower limit represents the beam diameter change required for the highly integrated far-infrared optical system 100 to achieve the target optical performance.

[0078] Please see Figure 1 , Figure 4 , Figure 7 , Figure 10 , Figure 13 and Figure 14 In some embodiments, the highly integrated far-infrared optical system 100 further includes a protective glass 30 disposed on the object side of the combined lens 20, which can reduce the risk of damage to the imaging detector matched with the highly integrated far-infrared optical system 100.

[0079] This application provides five highly integrated far-infrared optical systems 100 that meet usage requirements in five exemplary embodiments. The highly integrated far-infrared optical systems 100 provided in each embodiment of this application will be described in detail below.

[0080] Example 1

[0081] Figure 1 A schematic diagram of the architecture layout of the highly integrated far-infrared optical system 100 provided in Embodiment 1 is shown. Figure 1The highly integrated far-infrared optical system 100, along the optical axis 60 from the object plane 40 to the image plane 50, includes a refractive lens 10, a composite lens 20, and a protective glass 30. The refractive lens 10 is an aspherical lens. The micro / nano structure array 220 of the composite lens 20 is disposed on the first surface 210a of the lens body 210, and the second surface 210b of the lens body 210 is aspherical. Some parameters of the highly integrated far-infrared optical system 100 provided in Example 1 are shown in Table 1-1.

[0082] Table 1-1. Partial parameters of the highly integrated far-infrared optical system 100 provided in Example 1

[0083] parameter data Total optical length (TTL) 12.6mm Maximum field of view (2ω) 21.7° F-number 0.9 Effective focal length 9.4mm Operating band 8μm-12μm

[0084] As shown in Table 1-1, the total optical length of the highly integrated far-infrared optical system 100 is 12.6 mm, which is relatively short. Therefore, the volume of the highly integrated far-infrared optical system 100 provided in Example 1 is relatively small. The F-number of the highly integrated far-infrared optical system 100 is 0.9, thus, the highly integrated far-infrared optical system 100 has a large amount of light intake.

[0085] Starting from object plane 40, along the optical axis 60 from object plane 40 to image plane 50, each surface in the highly integrated far-infrared optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 1-2 below.

[0086] Table 1-2. Parameters of each surface in the highly integrated far-infrared optical system 100 provided in Example 1

[0087]

[0088] For each surface in Table 1-2, surface 1 is the surface of the refractive lens 10 near the object side, surface 2 is the surface of the refractive lens 10 near the image side, surface 3 is the surface of the composite lens 20 near the object side (since the micro / nano structure 220a is located on surface 3, surface 3 is referred to as the structural surface), surface 4 is the surface of the composite lens 20 near the image side, surface 5 is the surface of the protective glass 30 near the object side, surface 6 is the surface of the protective glass 30 near the image side, and surface 7 is the image surface 50.

[0089] As shown in Table 1-2, surface 1 has a radius of curvature of 7.4 mm, the distance between surface 1 and surface 2 is 2.6 mm, and the material between surface 1 and surface 2 is IRG206, a chalcogenide glass material. Surface 2 has a radius of curvature of 8.0 mm, the distance between surface 2 and surface 3 is 4.5 mm, and the material between surface 2 and surface 3 is air. Surface 3 has an infinite radius of curvature, meaning it is a plane, and the material between surface 3 and surface 4 is silicon. Surface 4 has a radius of curvature of -74.2 mm, the distance between surface 4 and surface 5 is 4.4 mm, and the material between surface 4 and surface 5 is air. Surface 5 has an infinite radius of curvature, meaning it is a plane, the distance between surface 5 and surface 6 is 0.7 mm, and the material between surface 5 and surface 6 is silicon. Surface 6 has an infinite radius of curvature, meaning it is a plane, the distance between surface 6 and surface 7 is 0.1 mm, and the material between surface 6 and surface 7 is air.

[0090] Surfaces 1, 2, and 4 are even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0091]

[0092] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 60; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; K is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 1, 2, and 4 can be found in Table 1-3.

[0093] Table 1-3. Coefficients of even-order aspherical surfaces in the highly integrated far-infrared optical system 100 provided in Example 1

[0094] Surface serial number K A B C D E F G 1 -20.1 4.6E-03 -3.5E-04 2.1E-05 -8.6E-07 2.1E-08 -2.7E-10 1.3E-12 2 -21.5 4.5E-03 -3.5E-04 1.8E-05 -3.8E-07 -2.1E-08 1.3E-09 -2.0E-11 4 -125.9 9.5E-05 1.2E-04 -4.8E-05 6.5E-06 -4.4E-07 8.9E-09 2.4E-10

[0095] Please refer to Table 1-3. For surface 1, K is -20.1, A is 4.6E-03, B is -3.5E-04, C is 2.1E-05, D is -8.6E-07, E is 2.1E-08, F is -2.7E-10, and G is 1.3E-12. The coefficients of even-order aspherical surfaces 2 and 4 can be obtained from Table 1-3 for surface 1, and will not be elaborated here.

[0096] In this application, the micro / nano structure array 220 and the lens body 210 together form a metasurface. Please refer to [link / reference needed]. Figure 2 , Figure 2 The phase distribution diagram of the metasurface in the highly integrated far-infrared optical system 100 provided in Embodiment 1 is shown. Figure 2 The horizontal axis represents the distance from the center of the metasurface. Figure 2The vertical axis represents phase. (From...) Figure 2 It can be seen that the absolute value of the maximum phase difference of the metasurface It is 12.8 × 2π rad. It is worth mentioning that... Figure 2 The actual phase distribution of the metasurface in Example 1 is given. Since the phase is a periodic function of 2π, there exists a relationship... (n is an integer, therefore, it can be based on the needs.) Figure 2 The phase of the metasurface in Example 1 is normalized by taking the remainder of 2π to meet the needs of actual metasurface processing.

[0097] Please see Figure 3 , Figure 3 The MTF (Modulation Transfer Function) field-of-view curve of the highly integrated far-infrared optical system 100 provided in Embodiment 1 is shown. Figure 3 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 3 The vertical axis represents the MTF value. Figure 3 The table lists the sagittal curve S1 and meridional curve T1 for the MTF at a spatial frequency of 21 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 for the MTF at a spatial frequency of 42 lp / mm as a function of field of view. (From...) Figure 3 It can be seen that within a 0.9 field of view (9.76°), the MTF is greater than 0.4, and within a 1.0 field of view (10.85°), the MTF is greater than 0.38, indicating that the highly integrated far-infrared optical system 100 has excellent imaging quality.

[0098] Example 2

[0099] Figure 4 A schematic diagram of the architecture layout of the highly integrated far-infrared optical system 100 provided in Embodiment 2 is shown. Figure 4 The highly integrated far-infrared optical system 100 includes, along the optical axis 60 from the object plane 40 to the image plane 50, a refractive lens 10, a composite lens 20, and a protective glass 30. The refractive lens 10 is an aspherical lens. The micro / nano structure array 220 of the composite lens 20 is disposed on the first surface 210a of the lens body 210, and the second surface 210b of the lens body 210 is aspherical. Some parameters of the highly integrated far-infrared optical system 100 provided in Embodiment 2 are shown in Table 2-1.

[0100] Table 2-1. Partial parameters of the highly integrated far-infrared optical system 100 provided in Example 2

[0101] parameter data Total optical length (TTL) 12.8mm Maximum field of view (2ω) 21.7° F-number 0.9 Effective focal length 9.7mm Operating band 8μm-12μm

[0102] As shown in Table 2-1, the total optical length of the highly integrated far-infrared optical system 100 is 12.8 mm, which is relatively short. Therefore, the volume of the highly integrated far-infrared optical system 100 provided in Example 2 is relatively small. The F-number of the highly integrated far-infrared optical system 100 is 0.9, thus, the highly integrated far-infrared optical system 100 has a large amount of light intake.

[0103] Starting from object plane 40, along the optical axis 60 from object plane 40 to image plane 50, each surface in the highly integrated far-infrared optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 2-2 below.

[0104] Table 2-2. Parameters of each surface in the highly integrated far-infrared optical system 100 provided in Example 2

[0105]

[0106]

[0107] For the analysis of each surface in Table 2-2, please refer to Example 1. This example will not perform the analysis again.

[0108] Surfaces 1, 2, and 4 are even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0109]

[0110] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 60; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; K is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 1, 2, and 4 can be obtained from Table 2-3.

[0111] Table 2-3. Coefficients of even-order aspherical surfaces in the highly integrated far-infrared optical system 100 provided in Example 2

[0112] Surface serial number K A B C D E F G 1 -14.8 5.0E-03 -3.6E-04 2.1E-05 -8.5E-07 2.1E-08 -2.7E-10 1.1E-12 2 -12.0 5.0E-03 -3.4E-04 1.8E-05 -4.1E-07 -2.2E-08 1.3E-09 -1.7E-11 4 99.6 -2.3E-04 6.9E-05 -4.9E-05 6.5E-06 -4.1E-07 1.1E-08 -1.1E-11

[0113] The coefficients of even-order aspherical surfaces 1, 2 and 4 can be found in Table 2-3. This embodiment will not elaborate on the coefficients of even-order aspherical surfaces 1, 2 and 4 one by one.

[0114] In this application, the micro / nano structure array 220 and the lens body 210 together form a metasurface. Please refer to [link / reference needed]. Figure 5 , Figure 5 The phase distribution diagram of the metasurface in the highly integrated far-infrared optical system 100 provided in Embodiment 2 is shown. Figure 5The horizontal axis represents the distance from the center of the metasurface. Figure 5 The vertical axis represents phase. (From...) Figure 5 It can be seen that the absolute value of the maximum phase difference of the metasurface It is 15 × 2π rad. It is worth mentioning that... Figure 5 The actual phase distribution of the metasurface in Example 2 is given. Since the phase is a periodic function of 2π, there exists a relationship... (n is an integer, therefore, it can be based on the needs.) Figure 5 The phase of the metasurface in Example 2 is normalized by taking the remainder of 2π to meet the needs of actual metasurface processing.

[0115] Please see Figure 6 , Figure 6 The MTF (Modulation Transfer Function) field-of-view curve of the highly integrated far-infrared optical system 100 provided in Embodiment 2 is shown. Figure 6 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 6 The vertical axis represents the MTF value. Figure 6 The table lists the sagittal curve S1 and meridional curve T1 for the MTF at a spatial frequency of 21 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 for the MTF at a spatial frequency of 42 lp / mm as a function of field of view. (From...) Figure 6 It can be seen that within a 0.7 field of view (7.6°), the MTF is greater than 0.4, and within a 1.0 field of view (10.85°), the MTF is greater than 0.35, indicating that the highly integrated far-infrared optical system 100 has excellent imaging quality.

[0116] Example 3

[0117] Figure 7 A schematic diagram of the architecture layout of the highly integrated far-infrared optical system 100 provided in Embodiment 3 is shown. Figure 7 The highly integrated far-infrared optical system 100, along the optical axis 60 from the object plane 40 to the image plane 50, includes a refractive lens 10, a composite lens 20, and a protective glass 30. The refractive lens 10 is an aspherical lens. The micro / nano structure array 220 of the composite lens 20 is disposed on the first surface 210a of the lens body 210, and the second surface 210b of the lens body 210 is aspherical. Some parameters of the highly integrated far-infrared optical system 100 provided in Example 3 are shown in Table 3-1.

[0118] Table 3-1. Partial parameters of the highly integrated far-infrared optical system 100 provided in Example 3

[0119] parameter data Total optical length (TTL) 12.8mm Maximum field of view (2ω) 21.7° F-number 0.9 Effective focal length 9.7mm Operating band 8μm-12μm

[0120] As shown in Table 3-1, the total optical length of the highly integrated far-infrared optical system 100 is 12.8 mm, which is relatively short. Therefore, the volume of the highly integrated far-infrared optical system 100 provided in Example 3 is relatively small. The F-number of the highly integrated far-infrared optical system 100 is 0.9, thus, the highly integrated far-infrared optical system 100 has a large amount of light intake.

[0121] Starting from object plane 40, along the optical axis 60 from object plane 40 to image plane 50, each surface in the highly integrated far-infrared optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 3-2 below.

[0122] Table 3-2. Parameters of each surface in the highly integrated far-infrared optical system 100 provided in Example 3

[0123]

[0124]

[0125] The analysis of each surface in Table 3-2 can be referred to Example 1, and will not be performed again in this example.

[0126] Surfaces 1, 2, and 4 are even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0127]

[0128] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 60; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; K is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 1, 2, and 4 can be found in Table 3-3.

[0129] Table 3-3. Coefficients of even-order aspherical surfaces in the highly integrated far-infrared optical system 100 provided in Example 3

[0130] Surface serial number K A B C D E F G 1 -15.7 4.8E-03 -3.6E-04 2.2E-05 -8.5E-07 2.1E-08 -2.7E-10 1.3E-12 2 -10.1 4.4E-03 -3.3E-04 1.9E-05 -4.0E-07 -2.3E-08 1.3E-09 -1.7E-11 4 100.0 -6.3E-04 1.0E-04 -4.8E-05 6.3E-06 -3.9E-07 1.3E-08 -1.6E-10

[0131] The coefficients of even-order aspherical surfaces 1, 2 and 4 can be found in Table 3-3. This embodiment will not elaborate on the coefficients of even-order aspherical surfaces 1, 2 and 4 one by one.

[0132] In this application, the micro / nano structure array 220 and the lens body 210 together form a metasurface. Please refer to [link / reference needed]. Figure 8 , Figure 8 The phase distribution diagram of the metasurface in the highly integrated far-infrared optical system 100 provided in Example 3 is shown. Figure 8 The horizontal axis represents the distance from the center of the metasurface. Figure 8 The vertical axis represents phase. (From...) Figure 8 It can be seen that the absolute value of the maximum phase difference of the metasurface It is 8.7 × 2π rad. It is worth mentioning that... Figure 8 The actual phase distribution of the metasurface in Example 3 is given. Since the phase is a periodic function of 2π, there exists a relationship... (n is an integer, therefore, it can be based on the needs.) Figure 8 The phase of the metasurface in Example 3 is normalized by taking the remainder of 2π to meet the needs of actual metasurface processing.

[0133] Please see Figure 9 , Figure 9 The MTF (Modulation Transfer Function) field-of-view curve of the highly integrated far-infrared optical system 100 provided in Embodiment 3 is shown. Figure 9 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 9 The vertical axis represents the MTF value. Figure 9 The table lists the sagittal curve S1 and meridional curve T1 for the MTF at a spatial frequency of 21 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 for the MTF at a spatial frequency of 42 lp / mm as a function of field of view. (From...) Figure 9 It can be seen that within the 0.8 field of view (8.68°), the MTF is greater than 0.4, and within the 1.0 field of view (10.85°), the MTF is greater than 0.39, indicating that the highly integrated far-infrared optical system 100 has excellent imaging quality.

[0134] Example 4

[0135] Figure 10 A schematic diagram of the architecture layout of the highly integrated far-infrared optical system 100 provided in Embodiment 4 is shown. Figure 10 The highly integrated far-infrared optical system 100, along the optical axis 60 from the object plane 40 to the image plane 50, includes a refractive lens 10, a composite lens 20, and a protective glass 30. The refractive lens 10 is an aspherical lens. The micro / nano structure array 220 of the composite lens 20 is disposed on the first surface 210a of the lens body 210, and the second surface 210b of the lens body 210 is aspherical. Some parameters of the highly integrated far-infrared optical system 100 provided in Example 4 are shown in Table 4-1.

[0136] Table 4-1. Partial parameters of the highly integrated far-infrared optical system 100 provided in Example 4

[0137] parameter data Total optical length (TTL) 12.6mm Maximum field of view (2ω) 21.7° F-number 0.9 Effective focal length 9.4mm Operating band 8μm-12μm

[0138] As shown in Table 4-1, the total optical length of the highly integrated far-infrared optical system 100 is 12.6 mm, which is relatively short. Therefore, the volume of the highly integrated far-infrared optical system 100 provided in Example 4 is relatively small. The F-number of the highly integrated far-infrared optical system 100 is 0.9, thus, the highly integrated far-infrared optical system 100 has a large amount of light intake.

[0139] Starting from object plane 40, along the optical axis 60 from object plane 40 to image plane 50, each surface in the highly integrated far-infrared optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 4-2 below.

[0140] Table 4-2. Parameters of each surface in the highly integrated far-infrared optical system 100 provided in Example 4

[0141]

[0142]

[0143] For the analysis of each surface in Table 2-2, please refer to Example 1. This example will not perform the analysis again.

[0144] Surfaces 1, 2, and 4 are even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0145]

[0146] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 60; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; K is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 1, 2, and 4 can be found in Table 4-3.

[0147] Table 4-3. Coefficients of even-order aspherical surfaces in the highly integrated far-infrared optical system 100 provided in Example 4

[0148] Surface serial number K A B C D E F G 1 -20.3 4.5E-03 -3.5E-04 2.1E-05 -8.5E-07 2.1E-08 -2.8E-10 1.4E-12 2 -17.4 4.1E-03 -3.4E-04 1.8E-05 -3.9E-07 -2.0E-08 1.3E-09 -1.9E-11 4 -23.3 5.3E-05 1.4E-04 -4.4E-05 7.1E-06 -5.2E-07 1.3E-08 9.3E-11

[0149] The coefficients of even-order aspherical surfaces 1, 2 and 4 can be found in Table 4-3. This embodiment will not elaborate on the coefficients of even-order aspherical surfaces 1, 2 and 4 one by one.

[0150] In this application, the micro / nano structure array 220 and the lens body 210 together form a metasurface. Please refer to [link / reference needed]. Figure 11 , Figure 11The phase distribution diagram of the metasurface in the highly integrated far-infrared optical system 100 provided in Example 4 is shown. Figure 11 The horizontal axis represents the distance from the center of the metasurface. Figure 11 The vertical axis represents phase. (From...) Figure 11 It can be seen that the absolute value of the maximum phase difference of the metasurface It is 3.1 × 2π rad. It is worth mentioning that... Figure 11 The actual phase distribution of the metasurface in Example 4 is given. Since the phase is a periodic function of 2π, there exists a relationship... (n is an integer, therefore, it can be based on the needs.) Figure 11 The phase of the metasurface in Example 4 is normalized by taking the remainder of 2π to meet the needs of actual metasurface processing.

[0151] Please see Figure 12 , Figure 12 The MTF (Modulation Transfer Function) field-of-view curve of the highly integrated far-infrared optical system 100 provided in Embodiment 4 is shown. Figure 12 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 12 The vertical axis represents the MTF value. Figure 12 The table lists the sagittal curve S1 and meridional curve T1 for the MTF at a spatial frequency of 21 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 for the MTF at a spatial frequency of 42 lp / mm as a function of field of view. (From...) Figure 12 It can be seen that within a 0.9 field of view (9.76°), the MTF is greater than 0.4, and within a 1.0 field of view (10.85°), the MTF is greater than 0.38, indicating that the highly integrated far-infrared optical system 100 has excellent imaging quality.

[0152] Example 5

[0153] Figure 13 or Figure 14 This diagram illustrates the architectural layout of the highly integrated far-infrared optical system 100 provided in Embodiment 5. Due to... Figure 13 and Figure 14 The highly integrated far-infrared optical system 100 shown has the same optical performance; the only difference between the two is the micro / nano structure 220a. Therefore, this embodiment uses... Figure 13 The highly integrated far-infrared optical system 100 shown will be described in detail. Figure 14 The description of the highly integrated far-infrared optical system 100 shown below can be found in the following text. Figure 13 The description of the highly integrated far-infrared optical system 100 shown will not be repeated here. Figure 13The highly integrated far-infrared optical system 100, along the optical axis 60 from the object plane 40 to the image plane 50, includes a refractive lens 10, a composite lens 20, and a protective glass 30. The refractive lens 10 is an aspherical lens. The micro / nano structure array 220 of the composite lens 20 is disposed on the first surface 210a of the lens body 210, and the second surface 210b of the lens body 210 is aspherical. Some parameters of the highly integrated far-infrared optical system 100 provided in Example 5 are shown in Table 5-1.

[0154] Table 5-1. Partial parameters of the highly integrated far-infrared optical system 100 provided in Example 5

[0155] parameter data Total optical length (TTL) 13.4mm Maximum field of view (2ω) 23° F-number 0.9 Effective focal length 9.4mm Operating band 8μm-12μm

[0156] As shown in Table 5-1, the total optical length of the highly integrated far-infrared optical system 100 is 13.4 mm, which is relatively short. Therefore, the volume of the highly integrated far-infrared optical system 100 provided in Example 5 is relatively small. The F-number of the highly integrated far-infrared optical system 100 is 0.9, thus, the highly integrated far-infrared optical system 100 has a large amount of light intake.

[0157] Starting from object plane 40, along the optical axis 60 from object plane 40 to image plane 50, each surface in the highly integrated far-infrared optical system 100 is numbered, and the parameters of each surface are summarized to obtain Table 5-2 below.

[0158] Table 5-2. Parameters of each surface in the highly integrated far-infrared optical system 100 provided in Example 5

[0159]

[0160] The analysis of each surface in Table 5-2 can be referred to Example 1, and will not be performed again in this example.

[0161] Surfaces 1, 2, and 4 are even-order aspherical surfaces, and their surface shapes satisfy the following relationship:

[0162]

[0163] Where Z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis 60; c is the surface curvature of the aspherical surface, c = 1 / R, where R is the radius of curvature of the aspherical surface; K is the conic coefficient; A, B, C, D... are aspherical coefficients. The values ​​of K, A, B, C, D... for surfaces 1, 2, and 4 can be found in Table 5-3.

[0164] Table 5-3. Coefficients of even-order aspherical surfaces in the highly integrated far-infrared optical system 100 provided in Example 5

[0165] Surface serial number K A B C D E F G 1 -23.0 4.5E-03 -3.6E-04 2.2E-05 -8.6E-07 2.1E-08 -2.8E-10 1.5E-12 2 -13.1 3.8E-03 -3.2E-04 1.7E-05 -4.0E-07 -2.0E-08 1.3E-09 -1.9E-11 4 1.6 -1.4E-04 1.3E-04 -3.5E-05 5.6E-06 -4.9E-07 2.2E-08 -4.0E-10

[0166] The coefficients of even-order aspherical surfaces 1, 2 and 4 can be found in Table 5-3. This embodiment will not elaborate on the coefficients of even-order aspherical surfaces 1, 2 and 4 one by one.

[0167] In this application, the micro / nano structure array 220 and the lens body 210 together form a metasurface. Please refer to [link / reference needed]. Figure 14 , Figure 14 The phase distribution diagram of the metasurface in the highly integrated far-infrared optical system 100 provided in Example 5 is shown. Figure 14 The horizontal axis represents the distance from the center of the metasurface. Figure 14 The vertical axis represents phase. (From...) Figure 14 It can be seen that the absolute value of the maximum phase difference of the metasurface It is 1.8 × 2π rad. It is worth mentioning that... Figure 14 The actual phase distribution of the metasurface in Example 5 is given. Since the phase is a periodic function of 2π, there exists a relationship... (n is an integer, therefore, it can be based on the needs.) Figure 14 The phase of the metasurface in Example 5 is normalized by taking the remainder of 2π to meet the needs of actual metasurface processing.

[0168] Please see Figure 15 , Figure 15 The MTF (Modulation Transfer Function) field-of-view curve of the highly integrated far-infrared optical system 100 provided in Embodiment 5 is shown. Figure 15 The horizontal axis in the figure represents the X-axis field of view angle, and its unit is degrees; Figure 15 The vertical axis represents the MTF value. Figure 15 The table lists the sagittal curve S1 and meridional curve T1 for the MTF at a spatial frequency of 21 lp / mm as a function of field of view, and the sagittal curve S2 and meridional curve T2 for the MTF at a spatial frequency of 42 lp / mm as a function of field of view. (From...) Figure 15 It can be seen that within a 0.9 field of view (10.35°), the MTF is greater than 0.42, and within a 1.0 field of view (11.5°), the MTF is greater than 0.39, indicating that the highly integrated far-infrared optical system 100 has excellent imaging quality.

[0169] After summarizing the parameters of the highly integrated far-infrared optical system 100 provided in the above five embodiments, Table 6 is shown below. Table 6 is mainly used to illustrate that the conditions met by the highly integrated far-infrared optical system 100 provided in this application have all been verified and supported by experiments.

[0170] Table 6. Parameters of the highly integrated far-infrared optical system 100 provided in each embodiment

[0171]

[0172]

[0173] This application also provides a highly integrated far-infrared optical lens (not shown), which includes an imaging detector (not shown) and the aforementioned highly integrated far-infrared optical system 100. The imaging detector is located on the image plane 50 of the highly integrated far-infrared optical system 100, and includes, but is not limited to, CMOS (Complementary Metal-Oxide Semiconductor) and CCD (Charge Coupled Device). The architecture layout of the highly integrated far-infrared optical system 100 can be referred to above, and will not be repeated here.

[0174] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A highly integrated far-infrared optical system, characterized in that, The highly integrated far-infrared optical system comprises, along the optical axis from the object side to the image side, a refractive lens and a combination lens; The optical power of the refractive lens is positive, the object-side surface of the refractive lens is convex to the object side, and the image-side surface of the refractive lens is convex to the object side; The combined lens has a positive optical power. The combined lens includes a lens body and a micro / nano structure array. The lens body includes a first surface and a second surface. The first surface is located on the object side of the lens body, and the second surface is located on the image side of the lens body. The micro / nano structure array is disposed on either the first surface or the second surface, and the other of the first surface and the second surface is a curved surface.

2. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system meets the following requirements: 0.6mm -1 <n1×(|c1|+|c2|)<1.0mm -1 Wherein, n1 is the refractive index of the refractive lens, c1 is the curvature of the object side of the refractive lens, and c2 is the curvature of the image side of the refractive lens.

3. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: Among them, f m is the focal length of the micro-nano structure array of the combined lenses, and f is the effective focal length of the highly integrated far-infrared optical system.

4. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: Where f2 is the focal length of the combined lens, and f is the effective focal length of the highly integrated far-infrared optical system.

5. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: Wherein, f2 is the focal length of the combined lens, f1 is the focal length of the refractive lens, and f is the effective focal length of the highly integrated far-infrared optical system.

6. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: Wherein, L1 is the distance between the object-side surface of the refracting lens and the image-side surface of the combined lens on the optical axis, and TTL is the total optical length of the highly integrated far-infrared optical system.

7. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: Wherein, Φ2 is the optical power of the combined lens, T2 is the center thickness of the combined lens, Φ1 is the optical power of the refractive lens, and T1 is the center thickness of the refractive lens.

8. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: in, f1 is the average of the focal length of the refractive lens and the focal length of the combined lens, and f2 is the focal length of the combined lens.

9. The highly integrated far-infrared optical system according to claim 1, characterized in that, The highly integrated far-infrared optical system satisfies: Among them, D max D is the maximum effective diameter of the larger of the maximum effective diameters of the refractive lens and the combined lens. min The maximum effective diameter is the smaller of the maximum effective diameters of the refractive lens and the combined lens.

10. A highly integrated far-infrared optical lens, characterized in that, include: The imaging detector and the highly integrated far-infrared optical system as described in any one of claims 1-9, wherein the imaging detector is disposed on the image plane of the highly integrated far-infrared optical system.

Images