Chalcogenide optical glass, method for producing the same, and optical element

Abstract

The application provides a chalcogen optical glass, a preparation method and an optical element. The chalcogen optical glass comprises the following components in terms of mole percentage: Ge: 10-15%, preferably 11-14%; Sn: 0.5-12%, preferably 1-10%; Ga: 3-7%, preferably 3.5-6.5%; Te: 70-80%, preferably 71-79%; Ag: 1-8%, preferably 2-7%; Fe: 0.1-3%, preferably 0.5-2%. The chalcogen optical glass has the advantages of environment-friendly components, high refractive index, good glass transition temperature, low thermal expansion coefficient and good infrared transmission performance in the atmospheric window region of 8-12 mu, and is suitable for precise mould pressing processing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of infrared optical glass, and particularly relates to a chalcogen optical glass, a preparation method thereof and an optical element. BACKGROUND

[0002] Chalcogen optical glass refers to a kind of infrared glass formed by taking S, Se and Te as basic components and introducing a certain amount of elements with weak electronegativity (Ge, As, Sb, Pb, etc.), and its transmission range contains three atmospheric windows of 1-3 μm, 3-5 μm and 8-12 μm. At present, the chalcogen optical glasses that can be mass-produced at home and abroad mainly include four systems, namely As-Se, Ge-As-Se, Ge-Sb-Se and Ge-Se-Te. Among them, the most widely used is As-Se system. 40 Se 60 Far-infrared glass, with a refractive index of 2.77 at 10 μm and a far-infrared cutoff wavelength of 16 μm; the highest refractive index of the Ge-Se-Te system chalcogen optical glass is 3.14 at 10 μm wavelength, and the far-infrared cutoff wavelength is 19.5 μm.

[0003] However, with the continuous expansion of the infrared market, designers have put forward higher technical requirements for chalcogen optical glass. In order to realize the lightweight and miniaturization of the lens, it is necessary to provide chalcogen optical glass with higher refractive index in batches; in addition, the global community has paid more and more attention to environmental protection, and many countries have limited the use of As, Pb and other toxic and harmful elements in mid- and far-infrared glasses.

[0004] Patent application CN116409930A discloses a Te-containing multi-component chalcogen optical glass, a preparation method and application thereof, which mainly contains the following components and their proportions: Ge: 10-20 at%; As: 30-50 at%; Se: 10-30 at%; Te: 20-40 at%; the refractive index at 10 μm wavelength is 3.0-3.23. The invention contains a certain proportion of Se element, which reduces the refractive index of the glass. At the same time, the components contain the toxic and harmful element As, which does not belong to environmentally friendly materials.

[0005] Patent application CN114671609A discloses a Cu-containing high-refractive chalcogen optical glass and a preparation method thereof, which includes the following components and proportions: Cu: 1-15 at%; As: 30-40 at%; Se: 30-40 at%; Te: 15-25 at%, the refractive index at 10 μm wavelength is 3.22-3.28, and the transition temperature is 162℃. The invention contains a certain proportion of Se element, which reduces the refractive index of the glass, and the introduction of Cu element reduces the optical transmission performance of the glass to a certain extent.

[0006] Patent application CN113912289A discloses a kind of multielement high refractive index chalcogenide optical glass and its preparation method.The component and proportion are as follows: Ge: 15-20at%; Sb: 15-20.2at%; Se: 50-60at%; Te: 2-5at%; Sn: 2-3at%; Pb: 1.5-2at%, its 10 μm refractive index is 2.93-3.16, glass transition temperature is 200-235℃.The main element of chalcogen in the invention is Se element, and the refractive index is relatively low.At the same time, its components contain toxic and harmful substance Pb element, which does not belong to environmental protection material.

[0007] Patent application CN113735440A discloses a kind of Ge base chalcogenide optical glass and its preparation method.It mainly contains component proportion: Ge: 5-40at%; Ga: 2-20at%; Ag: 2-15at%; Te: 30-80at%, its 10 μm refractive index is 3.47-3.5, glass transition temperature is 150-160℃.The invention does not contain Sn element and Fe element in Ge-Ga-Te glass system, although Ag element is introduced to improve the refractive index of glass, but its glass transition temperature is low, which limits the application range of glass. SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In view of the problems existing in the prior art, the present application provides a kind of chalcogenide optical glass.The components of the chalcogenide optical glass are environmentally friendly, have high refractive index at 10 μm, good glass transition temperature, and good infrared transmission performance in the 8-12 μm atmospheric window region, and are suitable for precision molding processing.

[0010] Further, the present application also provides a kind of preparation method of chalcogenide optical glass, which is simple and easy to operate, and the raw materials are easy to obtain, suitable for mass production.

[0011] SOLUTIONS TO PROBLEMS

[0012] The present application first provides a kind of chalcogenide optical glass, wherein it contains the following components in mole percent:

[0013] Ge: 10-15%, preferably 11-14%;

[0014] Sn: 0.5-12%, preferably 1-10%;

[0015] Ga: 3-7%, preferably 3.5-6.5%;

[0016] Te: 70-80%, preferably 71-79%;

[0017] Ag: 1-8%, preferably 2-7%;

[0018] Fe: 0.1-3%, preferably 0.5-2%.

[0019] The chalcogen optical glass according to the present application, wherein a ratio of a sum of the mole percentage of Ge and the mole percentage of Sn to the mole percentage of Ga (Ge+Sn) / Ga is 3 or more.

[0020] The chalcogen optical glass according to the present application, wherein a ratio of a sum of the mole percentage of Ge and the mole percentage of Sn to a sum of the mole percentage of Ga and the mole percentage of Fe (Ge+Sn) / (Ga+Fe) is 2.5-3.1.

[0021] The chalcogen optical glass according to the present application, wherein the chalcogen optical glass does not contain one or more than two of As, Pb, Cu, and Se.

[0022] The chalcogen optical glass according to the present application, wherein the chalcogen optical glass has a refractive index of 3.4-3.85 at 10 μm; and / or,

[0023] The chalcogen optical glass has a glass transition temperature of 150-190°C; and / or,

[0024] The chalcogen optical glass has an average transmittance of 50% or more in the atmospheric window of 8-12 μm.

[0025] The preparation method of the chalcogen optical glass according to the present application, wherein the method comprises weighing and mixing the components of the chalcogen optical glass according to the proportion, melting, cooling and solidifying, and annealing to obtain the chalcogen optical glass.

[0026] Further, the present application also provides a preparation method of the chalcogen optical glass according to the present application, wherein the method comprises the following steps:

[0027] The components of the chalcogen optical glass are weighed and mixed according to the proportion to obtain a mixture, and then the mixture is packaged in a sealed container; preferably, the vacuum degree in the sealed container is 10 -5 mbar or less;

[0028] The packaged container is melted, cooled and solidified, and then annealed to obtain the chalcogen optical glass.

[0029] The preparation method according to the present application, wherein the preparation method at least has one of the following conditions:

[0030] The melting temperature is 850-1100°C, and the melting time is 10-24h;

[0031] The temperature after the cooling is 300-500℃;

[0032] The method of the solidification comprises cooling and solidification by liquid nitrogen or ice water.

[0033] The annealing temperature is 130-180℃, and the annealing rate is -1 to -20℃ / h.

[0034] Further, the present application also provides an optical element, which comprises the chalcogenide optical glass according to the present application.

[0035] Effects of the present application

[0036] The chalcogenide optical glass according to the present application has the advantages of environment-friendly composition, high refractive index, good glass transition temperature, low thermal expansion coefficient, and good infrared transmission performance in the atmospheric window region of 8-12 μm, and is suitable for precision mold processing.

[0037] The preparation method of the chalcogenide optical glass according to the present application is simple and easy to implement, and the raw materials are easy to obtain, so that the chalcogenide optical glass is suitable for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 A refractive index curve of the chalcogenide optical glass of Example 4 is shown;

[0039] Figure 2 A Fourier infrared spectrum of the chalcogenide optical glass of Example 4 is shown. DETAILED DESCRIPTION

[0040] Various exemplary embodiments, features, and aspects of the present application will be described in detail below. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0041] In addition, in order to better illustrate the present application, numerous specific details are given in the following detailed description. Those skilled in the art will understand that the present application can be practiced without certain specific details. In some instances, well-known methods, devices, materials and procedures have not been described in detail in order to emphasize the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The meaning of "a", "an", and "the" includes plural references unless otherwise indicated. The meaning of "in" includes "in" and "on" unless otherwise indicated. The numerical values of the present application appearing in the present application should be understood to include the systematic errors that are inevitable in industrial production.

[0043] In the present specification, the meaning of "may" includes both the meaning of performing a certain process and the meaning of not performing a certain process.

[0044] In this specification, references to "some specific / preferred embodiments", "other specific / preferred embodiments", "embodiments", etc. mean that the particular element(s) described therein are included in at least one embodiment of the application and can or can not be present in other embodiments. In addition, it is to be understood that such elements can be combined in any suitable manner in the various embodiments.

[0045] In this specification, a numerical range expressed using "numerical value A - numerical value B" means a range including the end point numerical values A, B.

[0046] The present application first proposes a chalcogen optical glass comprising the following components in terms of mole percentage:

[0047] Ge: 10-15%, preferably 11-14%;

[0048] Sn: 0.5-12%, preferably 1-10%;

[0049] Ga: 3-7%, preferably 3.5-6.5%;

[0050] Te: 70-80%, preferably 71-79%;

[0051] Ag: 1-8%, preferably 2-7%;

[0052] Fe: 0.1-3%, preferably 0.5-2%.

[0053] The chalcogen optical glass of the present application introduces Te to ensure high refractive index, introduces appropriate amounts of Ge, Ga and Sn to improve the performance of the glass, introduces appropriate amounts of Ag to increase the refractive index of the glass, and introduces appropriate amounts of Fe to increase the transition temperature of the glass. Therefore, the present application comprises six elements of Ge, Sn, Ga, Te, Ag and Fe, and their roles in the glass are as follows:

[0054] The Ge element is an intermediate of the glass network structure, which can improve the glass network structure and effectively improve the strength and transition temperature of the glass. In the present application, if the content of Ge element is too low, the strength and transition temperature of the glass will decrease; if the content of Ge element is too high, the glass is prone to crystallization. Therefore, the content of Ge element in the present application is 10-15% in terms of mole percentage, preferably 11-14%, for example: 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, etc.

[0055] Sn element, as an intermediate of glass network structure, has a high coordination number, and can convert Te-Te bond into Te-Sn-Te bond in the glass structure, increase the proportion of polar covalent bond in the network structure, prevent Te element micro-aggregation from causing phase separation, and reduce the glass crystallization tendency. In addition, the polar covalent bond has a higher bond energy than the non-polar covalent bond, and the increase of the proportion of polar covalent bond is beneficial to the reduction of the thermal expansion coefficient of the glass. In addition, Sn element also has strong polarization, which can improve the refractive index of the glass to a certain extent. However, excessive addition of Sn element will lead to glass crystallization. Therefore, the content of Sn element (in terms of mole percentage) in the present application is 0.5-12%, preferably 1-10%, for example: 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, etc.

[0056] Ga element is an intermediate of glass network structure, has high polarization, and can improve the refractive index of the glass, but excessive addition will lead to easy crystallization of the glass. However, when the content of Ga element is too low, it cannot play a role in improving the refractive index of the glass. Therefore, the content of Ga element (in terms of mole percentage) in the present application is 3-7%, preferably 3.5-6.5%, for example: 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, etc.

[0057] In some specific embodiments, the ratio of the sum of the mole percentage of Ge element and the mole percentage of Sn element to the mole percentage of Ga element (Ge+Sn) / Ga is 3 or more, preferably 3-8, for example: 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 5.8, 6, 6.2, 6.5, 6.8, 7, 7.2, 7.5, 7.8, etc. When (Ge+Sn) / Ga is 3 or more, the anti-crystallization ability of the glass can be effectively improved.

[0058] Te, as a constituent element of the glass network structure, is the main building block of the glass network structure. As a high-molecular-weight chalcogenide element, Te is a major contributor to the glass's refractive index. However, if the Te content is too high, the large atomic radius of Te will lead to a porous glass structure, thereby lowering the transition temperature. If the content is too low, the glass refractive index will not be improved, and the crystallization performance of the glass will also be reduced. Therefore, in this invention, the Te content (in molar percentage) is 70-80%, preferably 71-79%, for example: 70.5%, 71%, 71.5%, 72%, 72.5%, 73%, 73.5%, 74%, 74.5%, 75%, 75.5%, 76%, 76.5%, 77%, 78.5%, etc.

[0059] Ag, as the outer component of the glass network structure, has a small ionic volume and can fill the gaps in the glass network structure or connect to the ends of long chains, effectively increasing the density of the glass network structure and improving the specific gravity of the glass. Simultaneously, the high polarizability of Ag can also effectively increase the refractive index of the glass. However, the introduction of excessive Ag can break the original chain network, destroy the glass network structure, and cause the glass to easily crystallize. If the content of Ag is too low, it cannot increase the refractive index of the glass. Therefore, in this invention, the amount of Ag introduced (in molar percentage) is controlled at 1-8%, preferably 2-7%, for example: 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, etc.

[0060] Fe acts as an intermediate element in the glass network structure. 2+ / Fe 3+ The absorption is mainly concentrated in the visible light range (200-500nm), i.e., the tinting degree of white light glass. In the chalcogenide optical glass of this invention, it is opaque in the visible light band, i.e., it does not affect the transmittance of the glass. At the same time, the introduction of an appropriate amount of Fe element increases the disorder of the glass structure, increases the glass transition temperature Tg, and decreases the glass's coefficient of thermal expansion. However, the introduction of excessive Fe element will cause the glass to easily crystallize, and if the amount of Fe element introduced is too low, the glass transition temperature Tg cannot be increased. Therefore, in this invention, the amount of Fe element introduced (in molar percentage) is controlled at 0.1-3%, preferably 0.5-2%, for example: 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, etc.

[0061] In some specific implementations, the ratio of the sum of the molar percentages of Ge and Sn to the sum of the molar percentages of Ga and Fe (Ge+Sn) / (Ga+Fe) is 2.5-3.1, for example: 2.6, 2.65, 2.7, 2.75, 2.8, 2.85, 2.9, 2.95, 3, 3.05, etc. When (Ge+Sn) / (Ga+Fe) is 2.5-3.1, the glass network structure is more rational, resulting in a glass transition temperature (Tg) higher than 150℃.

[0062] Furthermore, the chalcogenide optical glass of this invention preferably does not contain one or more of the elements As, Pb, Cu, and Se. Although adding As and Pb to glass can effectively improve glass-forming properties and transition temperature Tg, As₂O₃, formed by the oxidation of As, is a highly toxic substance; Pb itself is a heavy metal element that seriously endangers human health and is a RoHS prohibited substance. Therefore, considering environmental protection issues, toxic and harmful substances such as As and Pb are not added to the formulation of this invention.

[0063] Furthermore, the presence of a certain proportion of selenium (Se) in the glass reduces its refractive index; therefore, this invention preferably excludes Se. Similarly, the presence of a certain proportion of copper (Cu) in the glass reduces its optical transmittance to some extent; therefore, this invention preferably excludes Cu. Additionally, while sulfide (Sb) can be used as a clarifying agent in chalcogenide optical glasses to effectively eliminate bubbles, Te-based glasses have low viscosity, making bubble removal easy and thus eliminating the need for Sb. Moreover, Sb readily induces crystallization in the glass, and the Sb₂O₃ formed by the oxidation of Sb is a toxic and environmentally restricted substance. Therefore, this invention preferably excludes Sb.

[0064] In this invention, the Ge-Sn-Ga-Te-Ag-Fe chalcogenide optical glass provided is green and environmentally friendly. Te, with its high polarizability and high specific gravity, is used as the main building element of the glass network structure to give it a high refractive index. Ge and Ga elements are used to adjust its thermodynamic and mechanical properties. Sn and Fe elements are used to increase the disorder of the glass structure to improve its resistance to crystallization and transmittance. Ag, with its high polarizability and low coordination, is used to fill the gaps in the glass network structure to increase its specific gravity and refractive index.

[0065] The chalcogenide optical glass of this invention has a glass transition temperature of 150-190℃, a refractive index of 3.40-3.85 at 10μm, and an average transmittance of over 50% (2mm thick) in an atmospheric window of 8-12μm. Therefore, the chalcogenide optical glass of this invention has broad application value in the far-infrared region.

[0066] Furthermore, the present invention also provides a method for preparing chalcogenide optical glass, which includes weighing and mixing the components of chalcogenide optical glass in proportion, melting them, cooling and solidifying them, and annealing them to obtain chalcogenide optical glass.

[0067] Specifically, the preparation method of the present invention includes the following steps:

[0068] The components of the chalcogenide optical glass are weighed and mixed according to a certain ratio to obtain a mixture, which is then sealed in a sealed container; preferably, the vacuum degree in the sealed container is 10. -5 Below mbar;

[0069] The sealed container is melted, cooled and solidified, and then annealed to obtain chalcogenide optical glass.

[0070] Specifically, in this invention, the preparation method has at least one of the following conditions: the melting temperature is 850-1100℃, the melting time is 10-24h; the temperature after cooling is 300-500℃; the curing method includes cooling and curing with liquid nitrogen or ice water; the annealing temperature is 130-180℃, and the annealing rate is -1 to -20℃ / h; the sealed container can be an ampoule.

[0071] Furthermore, the preparation method of the present invention includes the following steps:

[0072] 1) Ingredient preparation and vacuum sealing: Weigh out raw materials in a certain proportion, including elemental Ge, Sn, Ga, Te, Ag, and Fe, with a purity ≥ 99.999%. Mix the raw materials thoroughly, fill ampoules, and then seal the mixture under a vacuum of 10°C using an oxyhydrogen flame. -5 Ampoules with a bar below mbar;

[0073] 2) Melting and quenching of the mixture: The packaged ampoule is placed in a swing furnace for high-temperature melting. The melting temperature is 850-1100℃ and the melting time is 10-24h. The melting process is agitated throughout to ensure that the raw materials are mixed evenly. When the melting temperature drops to 300-500℃, the ampoule is removed and solidified, forming a glass semi-finished product inside the ampoule.

[0074] 3) Annealing: Place the ampoule containing the glass semi-finished product into an annealing furnace. The annealing temperature is 130-180℃ and the annealing rate is -1 to -20℃ / h. After the temperature drops to room temperature, remove the ampoule from the annealing furnace.

[0075] 4) Breaking the ampoule and taking a sample: Break the ampoule to obtain chalcogenide optical glass, and then take a sample.

[0076] Furthermore, the present invention also provides an optical element comprising the chalcogenide optical glass described in the present invention.

[0077] Example

[0078] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0079] Examples 1-10

[0080] The preparation methods of the chalcogenide optical glasses in Examples 1-10 include the following steps:

[0081] 1) Ingredient preparation and vacuum sealing: Weigh out the elemental raw materials of Ge, Sn, Ga, Te, Ag, and Fe with a purity of 99.999% according to the components and molar contents of each embodiment in Table 1, pack them into ampoules, and evacuate to 10°C. -5 mbar uses an oxyhydrogen flame to seal ampoules containing the mixture.

[0082] 2) Melting and quenching of the mixture: The packaged ampoule is placed in a swing furnace for high-temperature melting at 1000℃ for 20 hours. The melting process is agitated throughout to ensure uniform mixing of the materials. When the melting temperature drops to 400℃, the ampoule is removed and placed in water to solidify, forming a glass semi-finished product inside the bottle.

[0083] 3) Annealing: Place the ampoule containing the glass semi-finished product into an annealing furnace. The annealing temperature is 150℃ and the annealing rate is -10℃ / h. After the temperature drops to room temperature, remove the ampoule from the furnace.

[0084] 4) Breaking the ampoule and taking a sample: Break the ampoule open to obtain chalcogenide optical glass.

[0085] Comparative Examples 1-4

[0086] Using the preparation methods of Examples 1-10, and following the raw material ratios in Table 2, chalcogenide optical glasses of Comparative Examples 1-4 were prepared.

[0087] Performance testing

[0088] The glass transition temperature (Tg) and coefficient of thermal expansion α(10) of the chalcogenide optical glasses prepared in Examples 1-10 and Comparative Examples 1-4 were tested using the test methods described below. -7 / K), refractive index n 10μmThe results are shown in Tables 1 and 2, respectively. In addition, the refractive index and infrared spectroscopy of the chalcogenide optical glass prepared in Example 4 were tested, and the results are shown in... Figure 1 and Figure 2 middle.

[0089] 1. Glass transition temperature (Tg), coefficient of thermal expansion α (10) -7 / K)

[0090] The glass transition temperature (Tg) and coefficient of thermal expansion α of the obtained chalcogenide optical glass were measured according to the test method of GB / T 7962.16-2010. The instrument used was a TMA tester from PE Corporation, USA.

[0091] 2. Average transmittance (8-12μm)

[0092] The transmittance of the obtained chalcogenide optical glass was tested according to the test method of GB / T 36403-2018, with the test range being 2.5-20 μm, and the average transmittance in the 8-12 μm range was taken. The instrument used was a Nicolet 380 Fourier transform infrared spectrometer from Thermo Fisher Scientific, USA.

[0093] 3. Refractive index n 10μm

[0094] The refractive index of the obtained chalcogenide optical glass was tested according to the test method of GB / T 34184-2017, including n. 10μm The instrument used was the SpectroMaster UV-VIS-IR high-precision refractive index meter from TRIOPTICS, Germany.

[0095] Table 1. Test results of glass composition and performance parameters in Examples 1-10

[0096]

[0097] Table 2. Test results of glass composition and performance parameters of Comparative Examples 1-4

[0098]

[0099] As shown in Table 1, the chalcogenide optical glass of the present invention has a high refractive index of 3.5-3.85, and a transmittance greater than 50% within the usable range (8-12 μm). Examples 1-10 and Comparative Examples 1-4 show that the refractive index of the chalcogenide optical glass is positively correlated with the Te element content, while the transition temperature of the chalcogenide optical glass is negatively correlated with the Te element content. The introduction of small amounts of large-atom Sn and / or Ag elements further improves the glass's refractive index. Adding a certain amount of Sn and / or Fe elements can effectively reduce the glass's coefficient of thermal expansion. Adding a certain amount of Ge and / or Fe elements helps to increase the glass's transition temperature Tg. However, excessively high Ge content will decrease the refractive index of the chalcogenide optical glass. Compared with Comparative Examples 1-4, the chalcogenide optical glass of the present invention possesses the advantages of a high refractive index, a high transition temperature Tg, and a low coefficient of thermal expansion.

[0100] Depend on Figure 1 and Figure 2 As can be seen, within the test range, the refractive index of the chalcogenide optical glass of the present invention is 3.4-3.85, while the transmittance within the usage range (8-12 μm) is above 50%. Furthermore, compared with Comparative Examples 1-4, the transmittance curve of the chalcogenide optical glass of the present invention is smoother, without obvious absorption peaks generated by oxygen-cations, thus not affecting the final performance.

[0101] It should be noted that although the technical solution of the present invention has been described with specific examples, those skilled in the art will understand that the present invention should not be limited thereto.

[0102] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A chalcogenide optical glass, characterized in that, It contains the following components in molar percentage: Ge: 10-15%; Sn: 0.5-12%; Ga: 3-7%; Te: 70-80%; Ag: 1-8%; Fe: 0.1-3%; The chalcogenide optical glass does not contain Pb and Cu; The ratio of the sum of the molar percentages of Ge and Sn to the molar percentage of Ga (Ge+Sn) / Ga is greater than 3; The ratio of the sum of the molar percentages of Ge and Sn to the sum of the molar percentages of Ga and Fe (Ge+Sn) / (Ga+Fe) is 2.5-3.

1.

2. The chalcogenide optical glass according to claim 1, characterized in that, It contains the following components in molar percentage: Ge: 11-14%; Sn: 1-10%; Ga: 3.5-6.5%; Te: 71-79%; Ag: 2-7%; Fe: 0.5-2%.

3. The chalcogenide optical glass according to claim 1 or 2, characterized in that, The chalcogenide optical glass does not contain one or a combination of two of As and Se.

4. The chalcogenide optical glass according to claim 1 or 2, characterized in that, The chalcogenide optical glass has a refractive index of 3.4-3.85 at 10 μm; and / or, The glass transition temperature of the chalcogenide optical glass is 150-190℃; and / or, The chalcogenide optical glass has an average transmittance of over 50% in an 8-12 μm atmospheric window.

5. A method for preparing chalcogenide optical glass according to any one of claims 1-4, characterized in that, The process involves weighing and mixing the components of chalcogenide optical glass according to a certain ratio, melting them, cooling and solidifying them, and then annealing them to obtain chalcogenide optical glass.

6. The preparation method according to claim 5, characterized in that, Includes the following steps: The components of the chalcogenide optical glass are weighed and mixed in proportion to obtain a mixture, which is then sealed in a sealed container. The sealed container is melted, cooled and solidified, and then annealed to obtain chalcogenide optical glass.

7. The preparation method according to claim 6, characterized in that, The vacuum level in the sealed container is 10. -5 Below mbar.

8. The preparation method according to any one of claims 5 to 7, characterized in that, The preparation method must meet at least one of the following conditions: The melting temperature is 850-1100℃, and the melting time is 10-24h; The temperature after cooling is 300-500℃; The curing method includes cooling and curing with liquid nitrogen or ice water; The annealing temperature is 130-180℃, and the annealing rate is -1 to -20℃ / h.

9. An optical element, characterized in that, Including the chalcogenide optical glass according to any one of claims 1-4.

Images