Infrared Material

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Infrared material

‌ 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

Tpyes and Features ot IR Materials

Property	Barium Fluoride (BaF₂)	Calcium Fluoride (CaF₂)	Cesium Bromide (CsBr)	Cesium Iodide (s)
Transmission Range	0.25–9.5 μm (>90%)	0.13–10 μm (>90%)	0.35–32 μm (>80%)	0.42–40 μm (>80%)
Refractive Index	1.466 @1.7 μm	1.428 @1.064 μm	1.668 @4 μm	1.743 @4 μm
	1.455 @4 μm	1.425 @1.7 μm	1.663 @10 μm	1.739 @10 μm
		1.4096 @4 μm	1.629 @25 μm	1.708 @30 μm
Thermo-Optic (dn/dT)	−15.2×10⁻⁶/K	−11.0×10⁻⁶/K	+79×10⁻⁶/°C	−99×10⁻⁶/°C
Density	4.89 g/cm³	3.18 g/cm³	4.44 g/cm³	4.51 g/cm³
Hardness (Knoop)	82 kg/mm²	158 kg/mm²	19.5 kg/mm²	20 kg/mm²
Modulus of Rupture	3800 psi	5295 psi	1218 psi	809 psi
Thermal Expansion	18.1×10⁻⁶/°C	18.85×10⁻⁶/°C	47.9×10⁻⁶/°C	50×10⁻⁶/°C
Surface Finish	UV/VIS: 20-10 scratch-dig	UV/VIS: 20-10 scratch-dig	IR: 60-40, 80-50, or 120-80 scratch-dig	IR: 60-40, 80-50, or 120-80 scratch-dig
	NIR: 40-20 scratch-dig	NIR: 40-20 scratch-dig
	MWIR: 60-40 scratch-dig	MWIR: 60--dig
Surface Figure	UV/VIS: 1/10–1/4 wave @0.6328 μm	UV/VIS: 1/10–1/4 wave @0.6328 μm	IR: 1/10–1/40 wave @10.6 μm	IR: 1/10–1/40 wave @10.6 μm
Surface Figure	IR: 1/2–2 wave @0.6328 μm	IR: 1/4–2 wave @0.6328 μm
AR Coating Options	0.8–2.5 μm, 3–5 μm, 1–5 μm BBAR	0.8–2.5 μm, 3–5 μm BBAR	Moisture-resistant AR & BBAR (customizable for CsBr range)	Moisture-resistant AR & BBAR (customizable for CsI range)
	Dual-band AR (3.5–5.1 μm & 7.5–10.5 μm)	Dual-band AR (MWIR/LWIR)
		Triple-band AR (NIR/MWIR)
Typical Applications	Thermal imaging, astronomy, laser optics (lenses, windows, beamsplitters)	Imaging, microlithography, laser optics (lenses, prisms, windows)	FTIR spectroscopy, CO₂ laser windows, high-resolution imaging
Typical Applications		IR spectroscopy, CO₂ laser protection, analytical instruments

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