Flexible infrared transparent chalcogenide glass and application of flexible infrared transparent chalcogenide glass as deformable lens

Abstract

The invention discloses flexible infrared transparent chalcogenide glass and application thereof as a deformable lens, the chalcogenide glass comprises a main element and an optional element, the main element is an S element, the optional element is at least one of Se, Te, Ge, As, Ga and I, the molar percentage content of the elements is as follows: S is greater than 50% mol, Se is less than 50% mol, Te is less than 30% mol, Ge is less than 10% mol, As is less than 10% mol, Ga is less than 10% mol, and I is less than 10% mol. The total amount of optional elements is less than 20% mol, the microstructure of the chalcogenide glass has a sulfur-rich glass network, and the sulfur-rich glass network is rich in a S8-xMx eight-membered ring structure which is composed of chalcogenide elements and contains 8 atoms. The chalcogenide glass has the advantages of good glass forming ability, outstanding flexibility and viscoelasticity, infrared transparency and high refractive index, and the prepared deformable lens can realize large-range adjustability of focal length and effective correction of aberration, and can be used in middle and far infrared deformation imaging systems.

Description

Technical Field

[0001] The invention relates to a flexible glass material and application thereof, and in particular to a flexible infrared transparent chalcogenide glass and application thereof as a deformable lens. Background Art

[0002] In the application fields of military, remote sensing, medicine, aerospace, astronomical observation, and automobile assisted driving, there is a demand for miniaturized and high-performance mid- and far-infrared optical imaging systems that can zoom over long distances and have high imaging quality. In traditional optical systems, only optical lens groups can be built in the imaging system to achieve zoom and aberration elimination by mechanically adjusting the distance between lenses with different parameters. However, this lens combination method directly leads to problems such as complex optical systems, large volumes, and weak beam coupling performance. In addition, especially when the incident light will be reflected on the surface of each lens every time it passes through it, it leads to serious light attenuation and deterioration of the imaging quality of the optical system. More importantly, since non-paraxial object points and non-paraxial light rays are both involved in imaging in actual optical systems, there is a deviation between the actual image and the ideal image - aberration. In response to the above problems, a method with considerable potential, deformable lens, has been proposed and demonstrated based on a wide range of physical effects. The deformable lens is made of a flexible elastic transparent body. The curvature and surface shape of the lens change by precisely applying strain through a controller. It has been proven that the focal length can be tuned over a fairly large range while achieving effective correction of low-order and high-order aberrations.

[0003] So far, deformable lenses can only be used in visible and near-infrared bands, and cannot be used in mid- and far-infrared optical imaging systems. The fundamental reason is that the deformable lenses reported so far are all developed based on flexible materials such as elastic transparent organic polymers PDMS, PMMA, polyvinyl chloride-based gels (SPNIPGels), organic esters DBA, and transparent liquid glycerol. These flexible materials show outstanding transmittance in the visible band, but there are a large number of strong characteristic absorption peaks in the infrared band, or they are opaque in the infrared, which makes them unsuitable for preparing infrared lenses.

[0004] Currently, the materials that can be used as infrared lenses include crystals (BaF2, CaF2, ZnSe, ZnS, etc.), semiconductors (germanium and gallium arsenide, etc.) and optical glasses (fluoride glass, tellurite glass and chalcogenide glass). However, because the cations in the crystal are tightly surrounded by anions, the deformation ability of the lattice is limited, making it difficult for the material to deform when subjected to external forces, thus showing brittleness. Germanium and gallium arsenide are semiconductor materials with diamond structures. The covalent bonds in this structure are very strong, which also makes it difficult for the material to deform when subjected to external forces, showing brittleness. Compared with chalcogenide glass, oxide glass and fluoride glass have smaller atomic radii and higher bond energies of chemical bonds (such as Si-O bonds), which will lead to high glass transition temperatures of oxide glass and fluoride glass (generally above 300°C), making oxide glass and fluoride glass hard, rigid and brittle. Therefore, oxide glass and fluoride glass cannot be used as materials for preparing infrared deformable lenses. Chalcogenide glass has been considered as an excellent infrared lens material due to its ultra-wide infrared transmission window, stable physical and chemical properties, low temperature refractive index coefficient (dn / dT), easy processing and preparation, and flexible and tunable components. However, the currently commercially available and reported chalcogenide glasses, such as As2S3, As2Se3, Ge-As-Se, Ge-Sb-S / Se, Ge-As-S / Se / Te, Ge-In-S-CsI, etc., have high elastic modulus (GPa order of magnitude) and glass transition temperature (above 100°C) at room temperature, which makes these materials hard and brittle and cannot be used as materials for preparing infrared deformable lenses. Therefore, the development of new flexible chalcogenide glass materials and the expansion of their application in infrared deformable lenses are of great scientific significance to the development of infrared imaging systems. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a flexible infrared transparent chalcogenide glass in view of the shortcomings of the prior art. The chalcogenide glass has good glass-forming ability, outstanding flexibility and viscoelasticity, infrared transparency, high refractive index, and can be controllably deformed under the action of external force to ensure that the curvature or surface shape is adjustable, thereby realizing the effective preparation of deformable lenses.

[0006] The technical solution adopted by the present invention to solve the first technical problem is: a flexible infrared transparent chalcogenide glass, the composition of the flexible infrared transparent chalcogenide glass includes a main element and an optional element, wherein the main element is S, the optional element is at least one element of Se, Te, Ge, As, Ga, and I, the molar percentage of the above elements is: S>50%mol, Se<50%mol, Te<30%mol, Ge<10%mol, As<10%mol, Ga<10%mol, I<10%mol, the total amount of the optional elements is <20%mol, the microstructure of the flexible infrared transparent chalcogenide glass has a sulfur-rich glass network, in which the sulfur-rich glass network is rich in sulfur-containing S atoms containing 8 atoms. 8-x M x An octagonal ring structure, wherein M is a Se element or a Te element, and the value of x is 0, 1, 2, 3 or 4.

[0007] The flexible infrared transparent chalcogenide glass of the present invention is a sulfur-based glass with good glass-forming ability. Its microstructure has a sulfur-rich glass network, and there are more sulfur-containing 8-atom S atoms in the sulfur-rich glass network. 8-x M x The eight-membered ring structure, the S 8-x M x The interaction between the octahedral ring structures is relatively low, resulting in a glass transition temperature T of the flexible infrared transparent chalcogenide glass of the present invention. g The temperature is lower than room temperature, so that the flexible infrared transparent chalcogenide glass of the present invention is in a viscoelastic state at room temperature, has outstanding viscoelasticity and flexibility, can be controllably deformed under the action of external force, and can achieve a tensile strain range of 0 to 1000%, a compressive strain range of 0 to 300%, and a bending strain range of 0 to 100%. It has excellent recovery characteristics, that is, an external force is applied to make the flexible infrared transparent chalcogenide glass of the present invention tensile, compressive or bending deformation. After the external force is removed, the flexible infrared transparent chalcogenide glass of the present invention can be restored to the state before deformation. Therefore, the flexible infrared transparent chalcogenide glass of the present invention can be used as a raw material to prepare a deformable lens, and the curvature or surface shape of the prepared deformable lens can be adjusted and controllable under the action of external force, which means that the prepared deformable lens has adjustable focal length and effective aberration correction capabilities. In addition, the flexible infrared transparent chalcogenide glass of the present invention has a high infrared transmittance of >60% and a high refractive index in the 2 to 20 μm band. The deformable lens made of the flexible infrared transparent chalcogenide glass of the present invention can be used in mid- and far-infrared deformable imaging systems, making the imaging system more integrated, opening up new ways for the infrared imaging system to develop in a lightweight direction and for its application in high-precision imaging systems such as military, remote sensing, medicine, aerospace, astronomical observation, and automobile assisted driving.

[0008] Appropriate amounts of Se, Ge, As, and Ga elements are selectively introduced into the flexible infrared transparent chalcogenide glass of the present invention. Depending on the specific elements introduced, [GeS4], [GaS4], [GeSe4], [GaSe4], [GeSSe3], [GeSeS3] tetrahedrons, [AsS3] trihedrons, [As-SS-As] and [Te / S] can be formed in the sulfur-rich glass network. n , [Se / S] n Bend chain, the forces between these tetrahedrons, trihedrons and bent chain structures are higher than S 8-x M x The octahedral ring structure makes the sulfur-rich glass network more stable, and the introduction of a small amount of tetrahedral, trihedral and bent chain structures only slightly increases the glass transition temperature T g , but can greatly improve the thermal stability of glass. In addition, the introduction of Se and Te elements can also greatly expand the infrared cutoff edge of chalcogenide glass from about 12μm to more than 20μm, thereby improving the infrared transmission performance of chalcogenide glass.

[0009] The flexible infrared transparent chalcogenide glass of the present invention has excellent flexibility, infrared transparency, and high refractive index, and can be controllably deformed under the action of external forces, thereby ensuring that the curvature or surface shape is adjustable, thereby achieving effective preparation of deformable lenses.

[0010] In a first preferred embodiment, the flexible infrared transparent chalcogenide glass is a binary glass system, the main element of which is S, and the optional element is one of Se, Ge and As.

[0011] In a second preferred embodiment, the flexible infrared transparent chalcogenide glass is a ternary glass system, the main element of which is S, and the optional elements are two different elements selected from Se, Te, Ge, As, Ga, and I.

[0012] In a third preferred embodiment, the flexible infrared transparent chalcogenide glass is a quaternary glass system, the main element of which is S, and the optional elements are three different elements selected from Se, Te, Ge, As, Ga, and I.

[0013] The second technical problem to be solved by the present invention is to provide the application of the above-mentioned flexible infrared transparent chalcogenide glass as a raw material for a deformable lens. The curvature or surface shape of the deformable lens prepared using the flexible infrared transparent chalcogenide glass of the present invention as a raw material is adjustable and controllable under the action of an external force, and can achieve a wide range of adjustable focal length and effective correction of aberrations, and can be used in mid- and far-infrared deformable imaging systems, making the imaging system lighter, smaller and more integrated.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] (1) The flexible infrared transparent chalcogenide glass of the present invention has good glass-forming ability, outstanding flexibility and viscoelasticity, can be controllably deformed under the action of external force, can achieve a tensile strain range of 0 to 1000%, a compressive strain range of 0 to 300%, and a bending strain range of 0 to 100%, and has excellent recovery characteristics. It can be used as a raw material to prepare a thin and light deformable lens. The curvature or surface shape of the prepared deformable lens is adjustable and controllable under the action of external force, and a wide range of adjustable focal length and effective correction of aberrations can be achieved. In addition, the flexible infrared transparent chalcogenide glass of the present invention has a high infrared transmittance of >60% and a relatively high refractive index in the 2 to 20 μm band;

[0016] (2) The deformable lens made of the flexible infrared transparent chalcogenide glass of the present invention can be used in mid- and far-infrared deformable imaging systems, making the imaging system lighter, more compact and more integrated, opening up new avenues for the development of infrared imaging systems in the direction of lightweight and their application in high-precision imaging systems such as military, remote sensing, medicine, aerospace, astronomical observation, and assisted driving of automobiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the sulfur-rich glass network contained in the infrared flexible chalcogenide glass in Examples 1 to 5;

[0018] Figure 2 The flexible infrared transparent chalcogenide glass Ge8S in Example 3 46 Se 46 Raman spectra;

[0019] Figure 3 An exploded view of the structure of the driving device used to control the deformation of the deformable lens in Examples 1 to 5;

[0020] Figure 4 A longitudinal section diagram of the effect of the deformable lens after installation in the storage bin;

[0021] Figure 5 It is a top view schematic diagram of the relative positions of eight sector-shaped piston pieces and the deformable lens;

[0022] Figure 6 Graph showing the relationship between the focal length and deformation of the deformable lenses prepared in Examples 1 to 5. DETAILED DESCRIPTION

[0023] In order to better understand the present invention, the present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto. For process parameters not particularly described, conventional techniques can be used.

[0024] Example 1: Infrared flexible chalcogenide glass based on S-Se binary glass system, whose molar composition is expressed as S 50 Se50 The microstructure of the infrared flexible chalcogenide glass has a sulfur-rich glass network, in which there are eight atoms of S rich in chalcogenide elements. 8-x Se x Eight-membered ring structure and [Se / S] n Bending chain, where S 8-x Se x Eight-membered ring structure and [Se / S] n The ratio of the number of bent long chains is 28: 1. The specific preparation steps of the infrared flexible chalcogenide glass are as follows:

[0025] (1) Prepare the raw materials S and Se with the required molar percentage ratio, weigh 40 g of the raw materials in a glove box filled with argon and dry, and mix them evenly;

[0026] (2) Place the mixed raw materials into a pre-cleaned dry quartz ampoule, and evacuate the quartz ampoule until the vacuum degree is less than 10 -3 Pa, and then the quartz ampoule was sealed with an oxyhydrogen flame;

[0027] (3) The sealed quartz ampoule is placed in a rocking furnace, and the temperature is first slowly increased to 250°C at a heating rate of 1°C / min, and kept at this temperature for 2 hours; then the temperature is slowly increased to 500°C at a heating rate of 0.5°C / min, and kept at this temperature for 2 hours; then the temperature is slowly increased to 800°C at a heating rate of 0.3°C / min, and then kept at 800°C for 24 hours while rocking, wherein the rocking rate is 3r / min and the rocking angle is 100°; after stopping the rocking and standing upright for 1 hour, the ampoule is taken out of the furnace and quenched to room temperature, thereby obtaining a flexible infrared transparent chalcogenide glass S 50 Se 50 ;

[0028] (4) The obtained flexible infrared transparent chalcogenide glass S 50 Se 50 Place it in a quartz glass container, then place the quartz glass container in a muffle furnace filled with inert gas, and heat the flexible infrared transparent chalcogenide glass S at 360°C. 50 Se 50 The glass is heated to a molten state, and finally the molten flexible infrared transparent chalcogenide glass is quickly poured into a graphite mold of the lens. After cooling and forming, it is optically polished to obtain a flexible infrared deformable lens.

[0029] Example 2: Infrared flexible chalcogenide glass based on As-S binary glass system, whose molar composition is expressed as As3S 97The microstructure of the infrared flexible chalcogenide glass has a sulfur-rich glass network, in which the sulfur-rich glass network is rich in chalcogenide elements and contains 8-atom S8 octahedral ring structures, [AsS3] trihedra and [As-SS-As] bent chains, wherein the ratio of the number of S8 octahedral ring structures, [AsS3] trihedra and [As-SS-As] bent chains is 11.5:1:1. The specific preparation steps of the infrared flexible chalcogenide glass are as follows:

[0030] (1) Prepare the raw materials As and S in the required molar percentage ratio, weigh 25 g of the raw materials in a glove box filled with argon and dry, and mix them evenly;

[0031] (2) Place the mixed raw materials into a pre-cleaned dry quartz ampoule, and evacuate the quartz ampoule until the vacuum degree is less than 10 -3 Pa, and then the quartz ampoule was sealed with an oxyhydrogen flame;

[0032] (3) The sealed quartz ampoule is placed in a rocking furnace, first slowly heated to 300°C at a heating rate of 0.5°C / min, and kept at this temperature for 3 hours; then slowly heated to 500°C at a heating rate of 1.5°C / min and kept at this temperature for 2 hours; finally slowly heated to 700°C at a heating rate of 1°C / min, and then kept at 700°C for 24 hours while rocking, wherein the rocking rate is 4r / min and the rocking angle is 60°; the rocking is stopped and the ampoule is left standing for 1 hour, then taken out of the furnace and quenched to room temperature, thereby obtaining a flexible infrared transparent chalcogenide glass As3S 97 ;

[0033] (4) The obtained flexible infrared transparent chalcogenide glass As3S 97 The quartz glassware was placed in a muffle furnace filled with inert gas, and the flexible infrared transparent chalcogenide glass As3S 97 The glass is heated to a molten state, and finally the molten flexible infrared transparent chalcogenide glass is quickly poured into a graphite mold of the lens. After cooling and forming, it is optically polished to obtain a flexible infrared deformable lens.

[0034] Example 3: Infrared flexible chalcogenide glass based on Ge-S-Se ternary glass system, the molar composition of which is represented by the chemical formula Ge8S 46 Se 46 Its Raman spectrum is shown in Figure 2 The microstructure of the infrared flexible chalcogenide glass has a sulfur-rich glass network, in which there are eight atoms of S rich in chalcogenide elements. 8-x Se xEight-membered ring structure, [GeSe4] tetrahedron, [GeSSe3] tetrahedron, [GeSeS3] tetrahedron, [GeS4] tetrahedron, [Se / S] n Bending chain, where S 8-x Se x The eight-membered ring structure, the four tetrahedrons mentioned above and [Se / S] n The ratio of the number of bending chains is 0.12:8:3.75. The specific preparation steps of the infrared flexible chalcogenide glass are as follows:

[0035] (1) Prepare the raw materials Ge, S and Se with the required molar percentage ratio, weigh 20 g of the raw materials in a glove box filled with argon and dry, and mix them evenly;

[0036] (2) Place the mixed raw materials into a pre-cleaned dry quartz ampoule, and evacuate the quartz ampoule until the vacuum degree is less than 10 -3 Pa, and then the quartz ampoule was sealed with an oxyhydrogen flame;

[0037] (3) The sealed quartz ampoule was placed in a rocking furnace, and the temperature was first slowly increased to 350°C at a heating rate of 2°C / min, and kept at this temperature for 1.5 hours; then the temperature was slowly increased to 600°C at a heating rate of 1°C / min and kept at this temperature for 2.5 hours; finally, the temperature was slowly increased to 800°C at a heating rate of 0.5°C / min, and then kept at 800°C for 20 hours while rocking, wherein the rocking rate was 5r / min and the rocking angle was 60°; the rocking was stopped and the ampoule was left standing for 1 hour, and then it was taken out of the furnace and quenched to room temperature, thereby obtaining a flexible infrared transparent chalcogenide glass Ge8S 46 Se 46 ;

[0038] (4) The obtained flexible infrared transparent chalcogenide glass Ge8S 46 Se 46 The quartz glassware was placed in a muffle furnace filled with inert gas and the flexible infrared transparent chalcogenide glass Ge8S was heated at 600 °C. 46 Se 46 The glass is heated to a molten state, and finally the molten flexible infrared transparent chalcogenide glass is quickly poured into a graphite mold of the lens. After cooling and forming, it is optically polished to obtain a flexible infrared deformable lens.

[0039] Example 4: Infrared flexible chalcogenide glass based on Ge-Ga-S ternary glass system, whose molar composition is represented by the chemical formula Ge1Ga2S 97The microstructure of the infrared flexible chalcogenide glass has a sulfur-rich glass network, in which there are S8 octahedral ring structures containing 8 atoms, [GeS4] tetrahedrons and [GaS4] tetrahedrons rich in chalcogenide elements, wherein the ratio of the number of S8 octahedral ring structures, [GeS4] tetrahedrons and [GaS4] tetrahedrons is 10.63:1:2. The specific preparation steps of the infrared flexible chalcogenide glass are as follows:

[0040] (1) Prepare the raw materials Ge, Ga and S in the required molar percentage ratio, weigh 20 g of the raw materials in a glove box filled with argon and dry, and mix them evenly;

[0041] (2) Place the mixed raw materials into a pre-cleaned dry quartz ampoule, and evacuate the quartz ampoule until the vacuum degree is less than 10 -3 Pa, and then the quartz ampoule was sealed with an oxyhydrogen flame;

[0042] (3) The sealed quartz ampoule is placed in a rocking furnace, first slowly heated to 300°C at a heating rate of 1°C / min, and kept at this temperature for 2 hours; then slowly heated to 700°C at a heating rate of 2°C / min and kept at this temperature for 2 hours; finally slowly heated to 800°C at a heating rate of 1°C / min, and then kept at 800°C for 24 hours while rocking, wherein the rocking rate is 5r / min and the rocking angle is 60°; the rocking is stopped and the ampoule is left standing for 1 hour, then taken out of the furnace and quenched to room temperature, thus obtaining a flexible infrared transparent chalcogenide glass Ge1Ga2S 97 ;

[0043] (4) The obtained flexible infrared transparent chalcogenide glass Ge1Ga2S 97 The quartz glass container is then placed in a muffle furnace filled with inert gas and the flexible infrared transparent chalcogenide glass Ge1Ga2S 97 The glass is heated to a molten state, and finally the molten flexible infrared transparent chalcogenide glass is quickly poured into a graphite mold of the lens. After cooling and forming, it is optically polished to obtain a flexible infrared deformable lens.

[0044] Example 5: Infrared flexible chalcogenide glass based on As-S-Te-I quaternary glass system, whose molar composition is expressed as I according to the chemical formula 10 Te2As3S 85 The microstructure of the infrared flexible chalcogenide glass has a sulfur-rich glass network, in which there are eight atoms of S rich in chalcogenide elements. 8-x Te x Eight-membered ring structure, [AsS3] trihedron, [Te / S] nBend chain and [As-SS-As] bend chain, where S 8-x Te x The ratio of the number of octahedral ring structure, [AsS3] trihedron, [Te / S] bent chain and [As-SS-As] bent chain is 10.63:1:1:1. The specific preparation steps of the infrared flexible chalcogenide glass are as follows:

[0045] (1) Prepare the raw materials I, Te, As and S in the required molar percentage ratio, weigh 25 g of the raw materials in a glove box filled with argon and dry and mix them evenly;

[0046] (2) Place the mixed raw materials into a pre-cleaned dry quartz ampoule, and evacuate the quartz ampoule until the vacuum degree is less than 10 -3 Pa, and then the quartz ampoule was sealed with an oxyhydrogen flame;

[0047] (3) The sealed quartz ampoule was placed in a rocking furnace, and the temperature was first slowly increased to 300°C at a heating rate of 0.5°C / min, and kept at this temperature for 3 hours; then the temperature was slowly increased to 500°C at a heating rate of 1.5°C / min and kept at this temperature for 2 hours; finally, the temperature was slowly increased to 700°C at a heating rate of 1°C / min, and then kept at 700°C for 24 hours while rocking, wherein the rocking rate was 5r / min and the rocking angle was 60°; the rocking was stopped and the ampoule was left standing for 1 hour, and then it was taken out of the furnace and quenched to room temperature, thereby obtaining a flexible infrared transparent chalcogenide glass I. 10 Te2As3S 85 ;

[0048] (4) The obtained flexible infrared transparent chalcogenide glass I 10 Te2As3S 85 Place it in a quartz glass container, then place the quartz glass container in a muffle furnace filled with inert gas, and heat the flexible infrared transparent chalcogenide glass I at a temperature of 300°C. 10 Te2As3S 85 The glass is heated to a molten state, and finally the molten flexible infrared transparent chalcogenide glass is quickly poured into a graphite mold of the lens. After cooling and forming, it is optically polished to obtain a flexible infrared deformable lens.

[0049] The schematic diagram of the structure of the sulfur-rich glass network contained in the infrared flexible chalcogenide glass in the above-mentioned Examples 1 to 5 is shown in Figure 1 . Figure 1 The two oval dotted lines in the figure are S 8-x M x Eight-membered ring structure.

[0050] The deformable lenses prepared in the above-mentioned embodiments 1 to 5 are respectively mounted on Figure 3 In a driving device shown, the focal length of the lens is regulated and the aberration is corrected by regulating the deformation of the lens. Figure 3 The driving device shown includes a top cap 1, an extrusion piston 2, a storage bin 3 and a bottom cap 4. The top cap 1 and the bottom cap 4 are respectively designed with a circular hole 11 and a circular hole 41 in the middle. The storage bin 3 is placed on the bottom cap 4, and the top cap 1 is placed on the storage bin 3. The storage bin 3 is divided into an upper bin 31 and a lower bin 32 in an annular shape. The extrusion piston 2 is divided into an upper piston 21 and a lower piston 22. The upper piston 21 and the lower piston 22 are respectively annular and consist of eight independent fan-shaped piston pieces 23. The outer periphery of the deformable lens 5 is integrally processed with a positioning ring 51. After the deformable lens 5 is installed in the above-mentioned driving device, as shown in FIG. Figure 4 and Figure 5 As shown, the upper side and the lower side of the deformable lens 5 are in contact with the upper piston 21 and the lower piston 22 respectively, and the positioning ring 51 is clamped by the upper chamber 31 and the lower chamber 32. When adjusting the deformation of the deformable lens 5, each sector-shaped piston piece 23 is precisely controlled by a stepping motor, and each sector-shaped piston piece 23 applies pressure to the deformable lens 5 separately, so that the deformable lens 5 undergoes different degrees of compression strain, thereby adjusting the curvature and surface shape of the deformable lens 5, and finally achieving the functions of zooming and correcting aberrations. In the actual application of the deformable lens, the device for adjusting the lens deformation is not limited to the above-mentioned driving device.

[0051] Figure 6 : is a graph showing the relationship between the focal length and deformation of the deformable lenses prepared in Examples 1 to 5. Figure 6 It can be seen that the deformable lens prepared with the flexible infrared transparent chalcogenide glass of the present invention can achieve focal length control in the range of 0 to 3.5 mm under a relatively small strain of less than 10%, and has a strong ability to control focal length and aberration.

Claims

1. A flexible infrared transparent chalcogenide glass, characterized in that: The composition of the flexible infrared transparent chalcogenide glass includes main elements and optional elements, wherein the main element is S, the optional element is at least one of Se, Te, Ge, As, Ga, and I, the molar percentage of the above elements is: S>50%mol, Se<50%mol, Te<30%mol, Ge<10%mol, As<10%mol, Ga<10%mol, I<10%mol, the total amount of the optional elements is <20%mol, and the microstructure of the flexible infrared transparent chalcogenide glass has a sulfur-rich glass network, in which there is a sulfur-rich glass network containing 8 atoms of S 8-x M x An octagonal ring structure, wherein M is a Se element or a Te element, and the value of x is 0, 1, 2, 3 or 4.

2. The flexible infrared transparent chalcogenide glass according to claim 1, characterized in that: The flexible infrared transparent chalcogenide glass is a binary glass system, the main element of which is S, and the optional element is one of Se, Ge and As.

3. The flexible infrared transparent chalcogenide glass according to claim 1, characterized in that: The flexible infrared transparent chalcogenide glass is a ternary glass system, the main element of which is S, and the optional elements are two different elements selected from Se, Te, Ge, As, Ga, and I.

4. The flexible infrared transparent chalcogenide glass according to claim 1, characterized in that: The flexible infrared transparent chalcogenide glass is a quaternary glass system, the main element of which is S, and the optional elements are three different elements among Se, Te, Ge, As, Ga, and I.

5. Use of the flexible infrared transparent chalcogenide glass according to any one of claims 1 to 4 as a raw material for a deformable lens.

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