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Infrared Materials
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Infrared Materials

Supplier
Atoptik
Category
Optical Material
Origin
China

Infrared optical material ‌refers to the materials specially used for processing or transmitting infrared light. It has excellent optical and mechanical properties and is widely used in infrared lasers, infrared sensors and other optical devices. Infrared optical materials are selected according to the required NIR, MWIR or LWIR band. Infrared optical materials have different transmittance in different bands, usually divided into near infrared (NIR, 0.7um~2.5um), mid-infrared (MIR, 2.5um~25um) and far infrared (FIR, 25um~1000um) according to wavelength. ‌Infrared optical material refers to the materials specially used for processing or transmitting infrared light. It has excellent optical and mechanical properties and is widely used in infrared lasers, infrared sensors and other optical devices. Infrared optical materials have different transmittance in different bands, usually divided into near infrared (NIR, 0.7um~2.5um), mid-infrared (MIR, 2.5um~25um) and far infrared (FIR, 25um~1000um) according to wavelength

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Overview

Infrared optical material ‌refers to the materials specially used for processing or transmitting infrared light. It has excellent optical and mechanical properties and is widely used in infrared lasers, infrared sensors and other optical devices. Infrared optical materials are selected according to the required NIR, MWIR or LWIR band. Infrared optical materials have different transmittance in different bands, usually divided into near infrared (NIR, 0.7um~2.5um), mid-infrared (MIR, 2.5um~25um) and far infrared (FIR, 25um~1000um) according to wavelength. ‌Infrared optical material refers to the materials specially used for processing or transmitting infrared light. It has excellent optical and mechanical properties and is widely used in infrared lasers, infrared sensors and other optical devices. Infrared optical materials have different transmittance in different bands, usually divided into near infrared (NIR, 0.7um~2.5um), mid-infrared (MIR, 2.5um~25um) and far infrared (FIR, 25um~1000um) according to wavelength

Specifications

ParameterValue
Transmission Range [Barium Fluoride (BaF₂)；>90%]0.25–9.5 μm (>90%)
Transmission Range [Calcium Fluoride (CaF₂)；>90%]0.13–10 μm (>90%)
Transmission Range [Cesium Bromide (CsBr)；>80%]0.35–32 μm (>80%)
Transmission Range [Cesium Iodide (s)；>80%]0.42–40 μm (>80%)
Refractive Index [Barium Fluoride (BaF₂)；@1.7 μm；@4 μm]1.466 @1.7 μm; 1.455 @4 μm
Refractive Index [Calcium Fluoride (CaF₂)；@1.064 μm；@1.7 μm；@4 μm]1.428 @1.064 μm; 1.425 @1.7 μm; 1.4096 @4 μm
Refractive Index [Cesium Bromide (CsBr)；@4 μm；@10 μm；@25 μm]1.668 @4 μm; 1.663 @10 μm; 1.629 @25 μm
Refractive Index [Cesium Iodide (s)；@4 μm；@10 μm；@30 μm]1.743 @4 μm; 1.739 @10 μm; 1.708 @30 μm
Thermo-Optic (dn/dT) [Barium Fluoride (BaF₂)]−15.2×10⁻⁶/K
Thermo-Optic (dn/dT) [Calcium Fluoride (CaF₂)]−11.0×10⁻⁶/K
Thermo-Optic (dn/dT) [Cesium Bromide (CsBr)]+79×10⁻⁶/°C
Thermo-Optic (dn/dT) [Cesium Iodide (s)]−99×10⁻⁶/°C
Density [Barium Fluoride (BaF₂)]4.89 g/cm³
Density [Calcium Fluoride (CaF₂)]3.18 g/cm³
Density [Cesium Bromide (CsBr)]4.44 g/cm³
Density [Cesium Iodide (s)]4.51 g/cm³
Hardness (Knoop) [Barium Fluoride (BaF₂)；Knoop]82 kg/mm²
Hardness (Knoop) [Calcium Fluoride (CaF₂)；Knoop]158 kg/mm²
Hardness (Knoop) [Cesium Bromide (CsBr)；Knoop]19.5 kg/mm²
Hardness (Knoop) [Cesium Iodide (s)；Knoop]20 kg/mm²
Modulus of Rupture [Barium Fluoride (BaF₂)]3800 psi
Modulus of Rupture [Calcium Fluoride (CaF₂)]5295 psi
Modulus of Rupture [Cesium Bromide (CsBr)]1218 psi
Modulus of Rupture [Cesium Iodide (s)]809 psi
Thermal Expansion [Barium Fluoride (BaF₂)]18.1×10⁻⁶/°C
Thermal Expansion [Calcium Fluoride (CaF₂)]18.85×10⁻⁶/°C
Thermal Expansion [Cesium Bromide (CsBr)]47.9×10⁻⁶/°C
Thermal Expansion [Cesium Iodide (s)]50×10⁻⁶/°C
Surface Finish [Barium Fluoride (BaF₂)]UV/VIS: 20-10 scratch-dig; NIR: 40-20 scratch-dig; MWIR: 60-40 scratch-dig
Surface Finish [Calcium Fluoride (CaF₂)]UV/VIS: 20-10 scratch-dig; NIR: 40-20 scratch-dig; MWIR: 60--dig
Surface Finish [Cesium Bromide (CsBr)]IR: 60-40, 80-50, or 120-80 scratch-dig
Surface Finish [Cesium Iodide (s)]IR: 60-40, 80-50, or 120-80 scratch-dig
Surface Figure [Barium Fluoride (BaF₂)；@0.6328 μm；@0.6328 μm]UV/VIS: 1/10–1/4 wave @0.6328 μm; IR: 1/2–2 wave @0.6328 μm
Surface Figure [Calcium Fluoride (CaF₂)；@0.6328 μm；@0.6328 μm]UV/VIS: 1/10–1/4 wave @0.6328 μm; IR: 1/4–2 wave @0.6328 μm
Surface Figure [Cesium Bromide (CsBr)；@10.6 μm]IR: 1/10–1/40 wave @10.6 μm
Surface Figure [Cesium Iodide (s)；@10.6 μm]IR: 1/10–1/40 wave @10.6 μm
AR Coating Options [Barium Fluoride (BaF₂)]0.8–2.5 μm, 3–5 μm, 1–5 μm BBAR; Dual-band AR (3.5–5.1 μm & 7.5–10.5 μm)
AR Coating Options [Calcium Fluoride (CaF₂)]0.8–2.5 μm, 3–5 μm BBAR; Dual-band AR (MWIR/LWIR); Triple-band AR (NIR/MWIR)
AR Coating Options [Cesium Bromide (CsBr)；Moisture-resistant AR & BBAR (customizable for CsBr range)]Moisture-resistant AR & BBAR (customizable for CsBr range)
AR Coating Options [Cesium Iodide (s)；Moisture-resistant AR & BBAR (customizable for CsI range)]Moisture-resistant AR & BBAR (customizable for CsI range)

Applications

Barium Fluoride (BaF₂): Thermal imaging, astronomy, laser optics (lenses, windows, beamsplitters) Calcium Fluoride (CaF₂): Imaging, microlithography, laser optics (lenses, prisms, windows); IR spectroscopy, CO₂ laser protection, analytical instruments Cesium Bromide (CsBr): FTIR spectroscopy, CO₂ laser windows, high-resolution imaging

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Supplier Information

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Atoptical Co., Ltd., established in 2007, is a leading manufacturer of advanced optical components, leveraging nearly 20 years of expertise to serve defense, aerospace, medical, and industrial sectors. ISO 9001:2015 certified, the company specializes in end-to-end optical solutions, including design, prototyping, coating, and mass production, using materials like N-BK7, Fused Silica, and specialty crystals. Its product portfolio features precision lenses, domes, prisms, and custom optics for extreme environments. With state-of-the-art cold processing, thin-film coating systems, and metrology labs, Atoptical ensures sub-micron accuracy. Renowned for rigorous QA/QC, it delivers globally with competitive pricing, supporting Fortune 500 firms and government agencies. Partner with Atoptical to innovate next-generation optical systems.

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