A visible light-laser-infrared compatible camouflage film imitating natural vegetation

Abstract

The present application belongs to the technical field of camouflage materials, and particularly relates to a visible light-laser-infrared compatible camouflage film imitating natural vegetation. The film comprises a substrate, a thermal-infrared dual-band camouflage layer, a near-infrared spectrum regulation layer and a visible light-laser-near-infrared regulation layer arranged in sequence. The upper layer of the natural vegetation imitating structure mainly realizes the simulation of the spectral characteristics of natural vegetation, and simultaneously realizes extremely low reflectivity at the wavelength of 1.06 mu m near-infrared laser by controlling the thickness of the film layer. The middle thermal-infrared camouflage structure realizes low emissivity of the medium-wave infrared and long-wave infrared. The substrate provides a bearing function. The multi-layer film not only realizes the fine simulation of the reflection spectrum of natural vegetation in the visible light-near-infrared wavelength range, but also has the functions of adjusting different visible light spectrum colors and resisting infrared detectors and 1.06 mu m laser detectors, and can realize the visible light-laser-infrared multi-band compatible camouflage performance covering a wide wavelength range of 0.4-14 mu m.

Description

Technical Field

[0001] This invention belongs to the field of camouflage materials technology, specifically relating to a visible light-laser-infrared compatible camouflage film that mimics natural vegetation. Background Technology

[0002] With the rapid development of optical detection technologies such as visible light, infrared, and laser, the demand for optical camouflage of targets is becoming increasingly urgent. Among these, the design and application of low-emissivity materials in the infrared detection band is a crucial means of countering infrared reconnaissance threats. Meanwhile, control methods in the visible light range mainly fall into two categories: simulating background color and reducing reflection intensity, to achieve low-feature signals under both visual and visible light detection equipment. Simulating the background requires adjusting the visible light reflection spectrum of the surface to blend the visible light color characteristics of the target surface with the background. Furthermore, to counter laser detection threats, the target surface needs to have low reflectivity at corresponding wavelengths to reduce echo signals. Facing the threat of multi-band detection methods, higher requirements are placed on the control of the spectral characteristics of camouflage materials.

[0003] Natural vegetation is a common background for camouflage targets. Currently, the main methods used to match its spectral characteristics in the visible-near-infrared band are as follows: 1. Directly extracting chlorophyll from plant leaves and using the isolated chlorophyll as a functional pigment to prepare green camouflage materials to simulate the color and spectral characteristics of green plants. However, because chlorophyll separated from living organisms is affected by light, temperature, etc., its spectral similarity is quickly lost; 2. Using biomimetic composite materials to simulate the water-containing characteristics of plants, such as using water-absorbing resin to store water to simulate the water stored in leaf cell vacuoles, directly using liquid water as a filler to prepare water-containing polyurethane coatings, using hydrothermal methods to insert organic pigments into the interlayer of magnesium-aluminum layered double hydroxides, and adjusting the water content by regulating the structure of mesoporous silica powder; 3. Using Cr2O3 particles to simulate the absorption characteristics of chlorophyll and the scattering characteristics of multilayered cells in plant leaves. While these biomimetic materials have achieved certain spectral simulation effects, challenges remain regarding stability and practicality. They exhibit poor temperature and weather resistance, and are prone to failure under prolonged sunlight exposure and alternating conditions of dryness / humidity, temperature, and day / night cycles, ultimately becoming metameristic materials that differ from the spectral characteristics of natural vegetation. Beyond considerations of spectral simulation itself, the complex manufacturing process, unique structural forms, and limited surface color restrict their compatibility with other camouflage techniques, significantly diminishing their practicality and scalability. Therefore, research on spectral camouflage materials in the visible-near-infrared band requires breakthroughs in new materials and technologies.

[0004] Multi-band compatible camouflage is essentially the manipulation of spectral responses across different wavelength ranges (or even within the same wavelength range), and these spectral responses are often contradictory. Visible-laser-infrared compatible camouflage studies methods for cross-band spectral manipulation within the 0.4–14 μm range. However, the narrowband absorption required at a typical laser wavelength of 1.06 μm contradicts the spectral characteristics needed to mimic natural vegetation. Furthermore, the film structure controlling the thermal infrared dual-band camouflage also affects the spectral characteristics of the visible-near-infrared bands. Due to the difficulty in balancing these multiple requirements, manipulation is challenging. Spectral manipulation technology offers a new solution to the design requirement of "same color, same spectrum" materials. Therefore, constructing spectral characteristics that mimic natural vegetation with tunable surface color using multilayer optical thin film design and combining them with thermal infrared and laser camouflage is a feasible approach.

[0005] In summary, there is currently no multilayer thin film system that can simultaneously meet the requirements of visible light-near infrared natural vegetation spectral characteristics, 1.06μm narrowband high absorption, and thermal infrared dual-band high reflectivity (low emissivity) to achieve the needs of visible light-laser-infrared compatible camouflage. Summary of the Invention

[0006] The purpose of this invention is to provide a visible light-laser-infrared compatible camouflage film that mimics natural vegetation, so as to achieve spectral compatibility control of visible light, laser and infrared bands, realize the simulation of visible light-near infrared spectral characteristics of natural vegetation and low emissivity of thermal infrared dual bands.

[0007] To achieve the above objectives, the present invention provides a visible light-laser-infrared compatible thin film that mimics natural vegetation, comprising a substrate, a thermal infrared dual-band camouflage and near-infrared spectral modulation layer, and a visible light-laser-near-infrared modulation layer stacked sequentially.

[0008] The thermal infrared dual-band stealth and near-infrared spectral control layer is stacked parallel to the substrate in a periodic order of MHMHMLMHMHMHMH, and the visible light-laser-near-infrared control layer is stacked parallel to the thermal infrared dual-band stealth and near-infrared spectral control layer in a periodic order of MHMHMHMHMHMLML.

[0009] Wherein, H represents a high refractive index material with a refractive index of 3.5-5, preferably 3.9-4.5; M represents a medium refractive index material with a refractive index of 2.1-2.8, preferably 2.2-2.6; and L represents a low refractive index material with a refractive index of 1.3-2, preferably 1.4-1.7.

[0010] It can be seen that the thermal infrared dual-band camouflage and near-infrared spectral modulation layer and the visible light-laser-near-infrared modulation layer are respectively composed of three multilayer dielectric materials with different refractive indices stacked alternately. The visible light-laser-near-infrared modulation layer can achieve selective absorption in the visible light band and visible light-near-infrared spectral modulation; the thermal infrared dual-band camouflage and near-infrared spectral modulation layer can achieve a thermal infrared dual-band high reflectivity band and assist in the modulation of waveforms in the near-infrared range.

[0011] Furthermore, the high refractive index material H is one of germanium, selenium, tellurium, silicon, and silicon carbide, preferably germanium, and the imaginary part of the refractive index of the high refractive index material is not zero in the visible light band; the medium refractive index material M is a sulfide, preferably zinc sulfide; the low refractive index material L is an oxide or a fluoride, the oxide including aluminum oxide and silicon dioxide, the fluoride including one of magnesium fluoride, ytterbium fluoride, and barium fluoride, and the low refractive index material L is preferably ytterbium fluoride.

[0012] Furthermore, the thermal infrared dual-band camouflage and near-infrared spectral modulation layer has 10 to 20 layers, and the visible light-laser-near-infrared modulation layer has 8 to 15 layers.

[0013] Furthermore, the thermal infrared dual-band camouflage and near-infrared spectral modulation layer and the visible light-laser-near-infrared modulation layer are both of the aforementioned periodic structures. That is, the visible light-laser-infrared compatible thin film that mimics natural vegetation includes a substrate, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a ytterbium fluoride film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a ytterbium fluoride film, a zinc sulfide film, and a ytterbium fluoride film, all stacked sequentially.

[0014] Furthermore, in the thermal infrared dual-band camouflage and near-infrared spectral modulation layer, the thickness of the germanium film is 5-500 nm, the thickness of the ytterbium fluoride film is 100-500 nm, and the thickness of the zinc sulfide film is 8-500 nm.

[0015] And / or, in the visible light-laser-near infrared modulation layer, the thickness of the germanium film is 5-100 nm, the thickness of the ytterbium fluoride film is 80-200 nm, and the thickness of the zinc sulfide film is 5-150 nm.

[0016] Furthermore, in the thermal infrared dual-band camouflage and near-infrared spectral control layer, the thicknesses of the zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, ytterbium fluoride film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, and germanium film are respectively 196x nm, 35x nm, 11x nm, 420x nm, 144x nm, 461x nm, 161x nm, 61x nm, 44x nm, 37x nm, 436x nm, 11x nm, 15x nm, and 409x nm, with x ranging from 98% to 102%, preferably from 99% to 100%.

[0017] For thermal infrared dual-band camouflage and near-infrared spectral modulation layers, when two media materials with different refractive indices satisfy the following equation, a high-reflection band is formed in the photonic bandgap at the effective wavelength:

[0018] n H d H =1 / 4λ, n L d L =1 / 4λ;

[0019] Where, n H n L d represents the refractive index of a medium with high and low refractive indices. H d L The thickness of the medium material with high and low refractive indices is represented by λ, and the wavelength of action is represented by λ.

[0020] Furthermore, in the visible light-laser-near-infrared modulation layer, the thicknesses of the zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, ytterbium fluoride film, zinc sulfide film, and ytterbium fluoride film are respectively 58x nm, 82x nm, 46x nm, 73x nm, 38x nm, 22x nm, 26x nm, 11x nm, 106x nm, 11x nm, 49x nm, 176x nm, 11x nm, and 99x nm, where x ranges from 98% to 102%, preferably from 99% to 100%.

[0021] Furthermore, the substrate is quartz glass or polyimide, which serves to support the multilayer film.

[0022] This invention provides a visible-laser-infrared compatible camouflage film that mimics natural vegetation. This film can simulate the spectral characteristics of natural vegetation in the visible-near-infrared range and has the ability to adjust different visible light spectral colors (such as dark green, light green, and withered yellow), accurately reproducing the optical properties of natural vegetation. Simultaneously, it is compatible with 1.06μm laser camouflage and thermal infrared dual-band camouflage functions.

[0023] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0024] 1. The visible-laser-infrared compatible camouflage material mimicking natural vegetation provided by this invention utilizes a multilayered thin film constructed by alternately stacking various dielectric materials with different refractive indices to achieve spectral compatibility modulation in the visible, laser, and infrared bands. This achieves simulation of the visible-near-infrared spectral characteristics of natural vegetation and low emissivity in both thermal and infrared bands. Simultaneously, by controlling the film thickness, extremely low reflectivity at the 1.06 μm near-infrared laser wavelength is achieved. Specifically, the thermal-infrared dual-band camouflage and near-infrared spectral modulation layer is used to obtain a high reflectivity band in the thermal-infrared dual-band and to assist in modulating the waveform of the simulated natural vegetation spectral characteristics in the near-infrared range, giving the film structure low emissivity in both thermal and infrared bands and improving its spectral similarity. The visible-laser-near-infrared modulation layer is used to achieve spectral modulation of the visible-near-infrared band and narrowband absorption at 1.06 μm, giving the film structure laser camouflage performance and improving the spectral similarity to simulated natural vegetation.

[0025] 2. This multilayer film can not only achieve a fine simulation of the reflectance spectrum of natural vegetation in the visible light to near-infrared wavelength range, but also has the function of adjusting different visible light spectral colors (such as dark green, light green, withered yellow, etc.) and countering infrared detectors and 1.06μm laser detectors. It can achieve multi-band compatible camouflage performance covering a wide wavelength range of 0.4 to 14μm, and the reflectance at the 1.06μm wavelength is less than 5%, which can achieve compatible camouflage performance against visible light detection, laser detection and infrared detection in complex environments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the visible light-laser-infrared compatible camouflage film in Embodiment 1 of the present invention;

[0027] Figure 2 The simulated and measured reflectance spectra of the visible-laser-infrared compatible camouflage film in the visible-near-infrared band in Embodiment 1 of the present invention are shown.

[0028] Figure 3 The simulated reflection, transmission, and absorption spectra of the visible light-laser-infrared compatible camouflage film in the visible light-near infrared band are shown in Embodiment 1 of the present invention.

[0029] Figure 4 The simulated and measured reflectance spectra of the visible light-laser-infrared compatible camouflage film in the 2-16 μm band in Embodiment 1 of the present invention are shown.

[0030] Figure 5The simulated reflection, transmission, and absorption spectra of the visible light-laser-infrared compatible camouflage film in the 2-16 μm band are shown in Embodiment 1 of the present invention.

[0031] Figure 6 The simulated reflectance spectra of the visible light-laser-infrared compatible camouflage films in Embodiments 1-3 of the present invention are shown in the visible light band. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Please see Figure 1 This invention proposes a visible light-laser-infrared compatible camouflage film that mimics natural vegetation. The multilayer film structure includes, from bottom to top: a substrate, a thermal infrared dual-band camouflage and near-infrared spectral control layer, and a visible light-laser-near-infrared control layer.

[0034] The bottommost substrate, which supports the multilayer film, is made of a solid or flexible material, including but not limited to quartz glass and polyimide. Quartz glass is preferred.

[0035] The thermal infrared dual-band camouflage (3–5 μm and 8–14 μm) and near-infrared spectral modulation layer (1.1–2.5 μm) are multilayer film structures composed of alternating stacks of various dielectric materials with different refractive indices. These structures are used to obtain a high-reflectance band in the thermal infrared dual-band and to assist in modulating the waveform of simulated natural vegetation spectral characteristics in the near-infrared range, giving the film structure a low emissivity in the thermal infrared dual-band and improving its spectral similarity. Preferably, the high-refractive-index material is germanium, the low-refractive-index material is ytterbium fluoride, and the medium-refractive-index material is preferably zinc sulfide. The thickness of the germanium layer is 5–500 nm, the thickness of the ytterbium fluoride layer is 100–500 nm, and the thickness of the zinc sulfide layer is 8–500 nm.

[0036] The visible-laser-near-infrared modulation layer (0.4–1.1 μm) is a multilayer film structure composed of alternating stacks of various dielectric materials with different refractive indices, including those with a non-zero imaginary part of refractive index. It enables selective absorption in the visible light band, visible-near-infrared spectral modulation, and narrowband absorption at 1.06 μm, giving the film structure laser camouflage properties and improving its spectral similarity. Preferably, germanium is the high-refractive-index material, ytterbium fluoride is the low-refractive-index material, and zinc sulfide is the preferred medium-refractive-index material. The thickness of the germanium layer is 5–100 nm, the ytterbium fluoride layer is 80–200 nm, and the zinc sulfide layer is 5–150 nm.

[0037] The multilayer film structure design of this invention has the following advantages: First, it can simultaneously meet the requirements of visible light-near infrared natural vegetation spectral characteristics, 1.06μm narrowband high absorption, and thermal infrared dual-band high reflectivity, achieving compatible camouflage performance against visible light detection, laser detection, and infrared detection in complex environments; Second, it has a good simulation effect of natural vegetation reflectance spectrum, with a high similarity to the spectral characteristics of natural vegetation in the visible light-near infrared range, and has the ability to adjust different visible light spectral colors (such as dark green, light green, withered yellow, etc.); Third, it has good laser camouflage performance, with a reflectivity of less than 5% at a wavelength of 1.06μm.

[0038] To simulate the visible-near-infrared spectral characteristics of natural vegetation, four main features need to be considered: "green peak", "red edge", "near-infrared plateau" and "water absorption peak". The "green peak" is a weak reflection peak near 550 nm in the reflectance spectrum, with a reflectance of about 10%. This characteristic is related to the absorption characteristics of chlorophyll in the visible light band of green vegetation. The "red edge" is a steep sloping edge formed by a rapid increase in reflectance from low to high in the 680-750 nm range, with reflectance increasing from less than 10% to about 50%. This characteristic is related to the selective absorption of chlorophyll and the scattering of multiple cell walls. The reflectance spectral line shows a sharp rise at the boundary between these two mechanisms. The "near-infrared plateau" is a plateau with high reflectance in the near-infrared region of 780-1300 nm, with reflectance maintained at 50%-60%. This characteristic is related to the scattering of multiple cell walls inside the leaf. The "water absorption peak" consists of two strong absorption peaks near 1450 nm and 1950 nm, both with reflectance below 10%. This characteristic is related to the water absorption characteristics of the leaf.

[0039] When simulating the spectral reflectance of natural plants, the high-reflectance bandgap formed by zinc sulfide and germanium can be used to simulate the "near-infrared plateau" characteristics in the 780–1300 nm range. By utilizing the strong resonant interference and selective absorption effects of germanium in the visible light band, the "green peak" and "red edge" characteristics can be simulated. The camouflage film structure mimicking natural vegetation consists of alternating stacks of germanium and zinc sulfide to form a quasi-periodic multilayer structure, with ytterbium fluoride added on top as an antireflection layer to further adjust the interference effect, control the positions of typical peaks and troughs, and thus adjust the visible light color. While ensuring high reflectance in both the thermal infrared and non-thermal infrared bands, the multilayer film also needs to have a high similarity to the reflectance spectrum of natural vegetation in the 400–2500 nm band and extremely low reflectance at a wavelength of 1.06 μm. This places higher demands on the film system design. Therefore, the structure, number of layers, and thickness of each layer of the multilayer film are optimized to achieve the desired target spectrum while meeting the camouflage requirements of different bands.

[0040] Example 1

[0041] In this embodiment, the structure of a visible light-laser-infrared compatible camouflage film mimicking natural vegetation includes, from bottom to top: a substrate, a thermal infrared dual-band camouflage and near-infrared spectral modulation layer, and a visible light-laser-near-infrared modulation layer, as shown in the specific structure below. Figure 1 As shown.

[0042] In this embodiment, the substrate material is quartz glass; the thermal infrared dual-band camouflage and near-infrared spectral modulation layer is a 14-layer multilayer film structure, which consists of 196nm zinc sulfide, 35nm germanium, 11nm zinc sulfide, 420nm germanium, 144nm zinc sulfide, 461nm ytterbium fluoride, 161nm zinc sulfide, 61nm germanium, 44nm zinc sulfide, 37nm germanium, 436nm zinc sulfide, 11nm germanium, 15nm zinc sulfide, and 409nm germanium.

[0043] The visible light-laser-near-infrared modulation layer is a 14-layer multilayer film structure, consisting of 58nm zinc sulfide, 82nm germanium, 46nm zinc sulfide, 73nm germanium, 38nm zinc sulfide, 22nm germanium, 26nm zinc sulfide, 11nm germanium, 106nm zinc sulfide, 11nm germanium, 49nm zinc sulfide, 176nm ytterbium fluoride, 11nm zinc sulfide, and 99nm ytterbium fluoride. The overall thickness of the multilayer film structure (excluding the substrate) is 3249nm.

[0044] The simulated and measured reflectance spectra of the visible-laser-infrared compatible camouflage multilayer films in the visible-near-infrared band in the above embodiments are shown below. Figure 2 As shown, the multilayer film structure is highly similar to the reflectance spectrum of natural green vegetation in the visible-near-infrared band, with a green reflectance peak at 550nm, a "red edge", a "near-infrared plateau" and a "water absorption peak", successfully achieving accurate simulation of typical spectral characteristics; at the same time, the reflectance at the 1.06μm laser wavelength is less than 5%, which has good laser camouflage performance.

[0045] In Example 1, the visible light color of the multilayer film is dark green, with chromaticity coordinates of (0.3535, 0.4476). By adjusting the thickness of the ytterbium fluoride and zinc sulfide on top of the visible light-laser-near-infrared control layer in Example 1, the reflectance spectrum of the multilayer film structure in the visible light band (400–780 nm) can be controlled, allowing for the design of colors such as withered yellow or other colors that blend with the background while maintaining an overall reflectance spectrum that is not significantly different from the original structure. Adjusting the thickness of the ytterbium fluoride on top of the visible light-laser-near-infrared control layer in Example 1 yields Examples 2 and 3. Due to the different thicknesses of the ytterbium fluoride, the reflection peaks of the multilayer film in the visible light range have different positions, resulting in different visible light colors (such as dark green, light green, withered yellow, etc.). The colors and chromaticity coordinates corresponding to Examples 1-3 are shown in Table 1, and the simulated reflectance spectra of Examples 1-3 in the visible light band are shown in Table 1. Figure 6 As shown.

[0046] Table 1. Surface ytterbium fluoride thickness and corresponding color attributes in Examples 1-3

[0047]

[0048] The simulated and measured reflectance spectra of the visible-laser-infrared compatible camouflage film in the 2–16 μm band of Example 1 above are shown below. Figure 3 As shown, the multilayer film structure can be seen to accurately simulate the typical spectrum of green vegetation and achieve laser camouflage, while also realizing a high reflectivity band in both the thermal infrared and long-wave infrared bands. It has high average reflectivity in both the mid-wave infrared and long-wave infrared bands (corresponding to a low average emissivity), and has good thermal infrared dual-band camouflage performance.

[0049] In summary, compared with existing compatible camouflage materials, the compatible camouflage material provided by this invention can simultaneously meet the requirements of visible light-near infrared spectral characteristics mimicking natural vegetation, high absorption in a narrow band of 1.06μm, and low emissivity in both thermal infrared bands. It can obtain vegetation spectral characteristics under different visible light colors (such as dark green, light green, and withered yellow), achieving compatible camouflage performance against visible light detection, laser detection, and infrared detection in complex environments. Not only does it have a high similarity to the spectral characteristics of natural vegetation in the visible light-near infrared range, but its measured reflectivity at a wavelength of 1.06μm is extremely low, and it also has good camouflage performance in both thermal infrared bands.

[0050] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A visible light-laser-infrared compatible thin film mimicking natural vegetation, characterized in that, It includes a substrate, a thermal infrared dual-band camouflage and near-infrared spectral modulation layer, and a visible light-laser-near-infrared modulation layer, which are stacked in sequence. The thermal infrared dual-band stealth and near-infrared spectral control layer is stacked parallel to the substrate in a periodic order of MHMHMLMHMHMHMH, and the visible light-laser-near-infrared control layer is stacked parallel to the thermal infrared dual-band stealth and near-infrared spectral control layer in a periodic order of MHMHMHMHMHMLML. Wherein, H represents a high refractive index material with a refractive index of 3.5-5, M represents a medium refractive index material with a refractive index of 2.1-2.8, and L represents a low refractive index material with a refractive index of 1.3-2; The thermal infrared dual-band camouflage corresponds to the bands of 3~5μm and 8~14μm, the near-infrared spectral modulation layer corresponds to the band of 1.1~2.5μm, and the visible light-laser-near-infrared modulation layer corresponds to the band of 0.4~1.1μm.

2. The visible light-laser-infrared compatible thin film mimicking natural vegetation according to claim 1, characterized in that, The high refractive index material H is one of germanium, selenium, tellurium, silicon, and silicon carbide; the medium refractive index material M is zinc sulfide; and the low refractive index material L is one of aluminum oxide, silicon dioxide, magnesium fluoride, ytterbium fluoride, and barium fluoride.

3. The visible light-laser-infrared compatible thin film mimicking natural vegetation according to claim 2, characterized in that, The visible light-laser-infrared compatible thin film that mimics natural vegetation comprises a substrate, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a ytterbium fluoride film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a germanium film, a zinc sulfide film, a ytterbium fluoride film, a zinc sulfide film, and a ytterbium fluoride film, all stacked sequentially.

4. The visible light-laser-infrared compatible thin film mimicking natural vegetation according to claim 3, characterized in that, In the aforementioned thermal infrared dual-band camouflage and near-infrared spectral modulation layer, the thickness of the germanium film is 5~500 nm, the thickness of the ytterbium fluoride film is 100~500 nm, and the thickness of the zinc sulfide film is 8~500 nm. And / or, in the visible light-laser-near infrared modulation layer, the thickness of the germanium film is 5~100 nm, the thickness of the ytterbium fluoride film is 80~200 nm, and the thickness of the zinc sulfide film is 5~150 nm.

5. The visible light-laser-infrared compatible thin film mimicking natural vegetation according to claim 4, characterized in that, In the thermal infrared dual-band camouflage and near-infrared spectral control layer, the thicknesses of the zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, ytterbium fluoride film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, and germanium film are 196x nm, 35x nm, 11x nm, 420x nm, 144x nm, 461x nm, 161x nm, 61x nm, 44x nm, 37x nm, 436x nm, 11x nm, 15x nm, and 409x nm, respectively, with x ranging from 98% to 102%.

6. The visible light-laser-infrared compatible thin film mimicking natural vegetation according to claim 4, characterized in that, In the visible light-laser-near infrared modulation layer, the thicknesses of the zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, germanium film, zinc sulfide film, ytterbium fluoride film, zinc sulfide film, and ytterbium fluoride film are 58x nm, 82x nm, 46x nm, 73x nm, 38x nm, 22x nm, 26x nm, 11x nm, 106x nm, 11x nm, 49x nm, 176x nm, 11x nm, and 99x nm, respectively, with x ranging from 98% to 102%.

7. The visible light-laser-infrared compatible thin film mimicking natural vegetation according to claim 1, characterized in that, The substrate is quartz glass or polyimide.

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