Custom Silicon Optical Windows | Infrared Silicon Windows

Silicon Windows

Silicon Optical Windows are high-performance single-crystal silicon optical components designed for infrared (IR) optical systems, offering excellent transmission in the NIR/MWIR (1.2–8 μm) bands, high mechanical strength, and thermal stability. They are widely used in thermal imaging, IR sensing, laser systems, aerospace, and industrial detection.
PEOPTIX provides custom silicon windows with precision machining, coating, and optomechanical integration for your project needs.

Description

Key Advantage

Broad spectral transmission
Low mid-infrared absorption
Excellent infrared performance
Premium mechanical and thermal performance
High machinability for precision manufacturing and coating

Silicon (Si) Material Properties

Material	Silicon (Si)
Transmission Range	1.2 – 8µm
Refractive Index	@ 3 µm: 3.43 @ 4 µm: 3.42 @ 5 µm: 3.41
Density	2.33 g/cm³（25°C）
Coefficient of Thermal Expansion (CTE)	2.6 × 10⁻⁶ /°C (@20°C)
Thermal Conductivity	163.3 W/(m·K) @ 20°C
Knoop Hardness	1150 kg/mm²
Absorption Coefficient	< 0.01 cm⁻¹@ 3 µm
Young's Modulus (GPa)	131 GPa
Poisson's Ratio	0.28

Processing Specifications

Parameters	Regular	High precision
Dimension	Φ8mm-Φ300mm
Diameter Tolerance	±0.1mm	±0.02mm
Thickness Tolerance	±0.05mm	+0/-0.01 mm
Parallelism (arcmin)	< 1′ (1 arcmin)	< 10″ (10 arcsec)
Surface Quality	60-40	40-20
Surface Flatness (P-V)	PV<1 λ@632.8nm	PV<λ/4@632.8nm
Coating	Custom AR, BBAR, AR+DLC

Application Fields

Thermal Imaging & Infrared Cameras (3–5 μm MWIR band)

Manufacture silicon lenses and protective windows for uncooled thermal imaging equipment used in industrial temperature measurement, fire protection, security monitoring and drone detection.

Medical Infrared Systems (3–5 μm MWIR band)

Optical lenses for medical infrared thermal diagnosis and human tissue spectral analysis, as well as matching reflective substrates for medical aesthetic infrared lasers.

Silicon Windows

Description

Related Products

Prism lenses/Filter/Mirror

Die casting

Customized Products (CNC Products)

Aspheric Lenses

Spherical lenses

Plane mirror