Lithium fluoride

Lithium fluoride

Supplier
Zeit-group
Category
Optical Material
Origin
China

An optical window is a transparent physical barrier that transmits light between different environments.

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Overview

An optical window is a transparent physical barrier that transmits light between different environments. Lithium fluoride crystal transmits from 105nm in the vacuum ultraviolet to 6.0um in the infrared and is described as offering the best vacuum-ultraviolet transmission. It is widely used for ultraviolet, visible and infrared windows, lenses, prisms and refractive elements. The source also mentions detector crystals, but the detector designation is unclear. Its low refractive index allows use without an antireflection coating. Lithium fluoride is an excellent material for achromatic and apochromatic optics and is widely used in ultraviolet and infrared transmitting windows, lenses and prisms. Surface reflection losses depend on its refractive index.

Specifications

ParameterValue
MaterialLiF
Surface Figure AccuracyPolished Surface
Parallelism≤30 arcsec
Surface Quality60-40
Dimensional Tolerance±0.1mm
Molecular FormulaLiF
Transmission Range0.105---6μm
Reflection Loss [4.0 μm]4.4% @4.0 μm
Thermal conductivity [41°C]11.3 W/(m·K) @41°C
Melting Point870°C
Density2.63905g/cm³
Specific Heat1562J/(kg·K)
Thermal Expansion [0°---100°C]37·10⁻⁶/°C @0°---100°C
Refractive Index [2.5 μm]1.37327 @2.5 μm
Refractive Index [0.121 μm]1.624 @0.121 μm
Mohs [Indenter load: 600g]102-113 (Indenter load: 600g)
Young's Modulus64.79 GPa
Shear Modulus55.14 GPa
Bulk Modulus62.03 GPa
Modulus of Rupture10.8 MPa
Elastic ConstantsC11=112; C12=45.6; C44=63.2 GPa
Dielectric Constant [25°C;f=100...109 Hz]9.0 @25°C, f=100...109 Hz
Water Solubility [18°C]0.27g / 100g @18°C
Material TypeSingle crystal, synthetic
Crystal StructureCubic
Cleavage Plane(100)

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Supplier Information

Ze
Zeit-group
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Chengdu Zhongke Zhuoer Intelligent Technology Group Co., Ltd. is a leading enterprise in the field of optics and semiconductors, recognized as a National High-Tech Enterprise, a Sichuan Province “Specialized, Refined, Distinctive, and Innovative” “Little Giant” Enterprise, a Chengdu New Economy “Double Hundred” Enterprise, and a Chengdu High-Tech Zone “Four Categories of High-Level Talent” Enterprise. Leveraging its exceptional technical capabilities—including independent R&D, patented technologies, and technological innovation—the company has achieved breakthroughs in ultra-precision polishing, precision inspection, and coating processes in the chip and display sectors. Its key products include high-end quartz blank masks, precision optical components and active devices, precision inspection equipment, and high-performance coating technology services, establishing the company as a core technology-driven enterprise with a competitive supply chain advantage in replacing imported products with domestically produced alternatives. To date, the company has been granted over 80 patents and collaborates with five affiliated institutions and scientific research units. It has established a precision optical processing production base and a precision optical system assembly and calibration center. The company has forged deep industry-academia-research partnerships with global research institutes, renowned universities, and industry associations in the optoelectronics field. Grounded in high-level scientific and technological self-reliance, it is committed to conquering key core technologies, continuously accumulating technical expertise, and tackling key process challenges, striving to become a leading enterprise in the development and industrialization of high-tech optoelectronic products. Through continuous efforts, Zhongke Zhuoer has achieved one qualitative leap after another. In the future, the company will deepen collaborative partnerships along the industry value chain to enhance its core capabilities, embrace innovation, and contribute to the development of critical upstream materials and integrated process technologies for China’s optoelectronics industry.

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Lithium fluoride
Zeit-group · Optical Material
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