Custom Sapphire Windows

Sapphire Window

Sapphire windows are single-crystal aluminum oxide (Al₂O₃) optical windows designed for demanding UV, visible, near-infrared and MWIR applications. With Mohs 9 hardness, excellent scratch resistance, high thermal stability and strong chemical durability, sapphire windows are widely used to protect sensors, cameras, lasers and optical instruments in harsh environments. Peoptix supplies custom sapphire windows with precision polishing, edging, coating and inspection according to customer drawings or application requirements.

Description

Key Advantages

High hardness and excellent scratch resistance (Mohs 9), ideal for protective optical windows.
Broad transmission from UV to MWIR (0.17-5.5 um), depending on grade, thickness and coating.
Excellent thermal stability for high-temperature or high-power optical systems.
Strong chemical resistance for industrial, medical and outdoor environments.

Sapphire Material Properties

Material	Single Crystal Aluminum Oxide; Sapphirre
Transmission Range	0.17 - 5.5 μm
Refractive Index	No = 1.75449 Ne = 1.74663 @ 1.06 μm
Density	3.97 g/cm³
Coefficient of Thermal Expansion (CTE)	5.6× 10⁻⁶ /°C
Thermal Conductivity	27.21W/m·K@ 300 K
Knoop Hardness	1900 kg/mm²
Absorption Coefficient(1/cm)	0.3 × 10⁻³ cm⁻¹ @ 2.4 μm
Young's Modulus (GPa)	335 GPa
Poisson's Ratio	0.25

Processing Specification

Parameters	Regular	High precision
Dimension	Φ10mm-Φ300mm
Diameter Tolerance	±0.05mm	±0.01mm
Thickness Tolerance	±0.2mm	±0.01mm
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
Bevel / Chamfer	Protective bevel	Customized precision bevel
Coating	Custom AR , BBAR Coating