Ultra HD Surveillance Sapphire Glass Lens Ensures Pure Image

Product Description

Parameter Category	Parameter Name	Value / Description / Typical Value	Test Conditions / Notes
Basic Information	Product Name	Sapphire Glass Optical Window
	Material Composition	Single Crystal α-Aluminium Oxide (
	Crystal Structure	Hexagonal Crystal System	Anisotropic Crystal
	Growth Method	Kyropoulos Method, Heat Exchanger Method (HEM), Edge-defined Film-fed Growth (EFG)
	Product Form	Flat, Spherical, Aspheric (Customizable)	Can be customized to requirements
Physical Properties	Density	3.97 - 3.99 g/cm³
	Mohs Hardness	9	Second only to diamond (10)
	Knoop Hardness	~2000 kg/mm²	Load 100g
	Young's Modulus	345 GPa
	Shear Modulus	145 GPa
	Poisson's Ratio	0.25 - 0.27
	Compressive Strength	>2.0 GPa
	Flexural Strength	> 690 MPa	Highly dependent on surface finish quality
Thermal Properties	Melting Point	2040 °C
	Maximum Operating Temperature	1900 °C (Vacuum/Inert Gas) / ~1000°C (Air)	High temps in air may cause surface devitrification
	Coefficient of Thermal Expansion (CTE)		@ 25°C
	Thermal Conductivity	25 - 35 W/(m·K)	@ 20°C, ~30x higher than ordinary glass
	Specific Heat Capacity	750 J/(kg·K)	@ 25°C
Optical Properties	Crystal Type	Uniaxial Negative Crystal
	Refractive Index (@587.6 nm)	no = 1.768 / ne = 1.760
	Abbe Number	72.2 (based on no)	Low dispersion
	Transmission Range	0.15 μm - 5.5 μm	Deep UV to Mid-IR
	Internal Transmittance	>85% @ 0.3μm (1mm thick) / >80% @ 4μm (1mm thick)	Depends on thickness and coating
	Refractive Index Homogeneity
	Birefringence	0.008	Crystal orientation must be considered
Surface Specifications	Diameter/Size Tolerance	±0.02 mm or customized
	Thickness Tolerance	±0.01 mm or customized
	Parallelism	< 3 arcsec (High Precision) / < 1 arcmin (Standard)
	Flatness	λ/10 @ 632.8nm / λ/4 (Standard)	MIL-O-13830
	Surface Finish (Quality)	10-5 Scratch-Dig (Standard) / Up to 20-10 (High Grade)	MIL-PRF-13830B
	Clear Aperture	> 90%
	Bevel	< 0.1mm x 45° (Protective bevel)
Chemical & Electrical Properties	Chemical Stability	Excellent. Insoluble in water, resistant to strong acids (e.g., HCl, HNO) and strong bases (slight corrosion at high temps).
	Water Resistance	Class 1	ISO 719
	Dielectric Constant (@1 MHz)
	Volume Resistivity		@ 25°C
	Dielectric Strength	480 kV/cm
Coating Options	Anti-Reflection (AR) Coating	Reduces reflection losses, increases transmission in specific bands (e.g., NIR, VIS, specific laser wavelength)	Single side R<0.25% @ specified wavelength
	High Reflection (HR) Coating	Achieves high reflectivity at specific wavelengths (e.g., for laser cavities)	R>99.5% @ specified wavelength
	Oleophobic/ Hydrophobic Coating	Anti-fingerprint, easy to clean, surface protection	Water Contact Angle > 110°
	Conductive Coating (e.g., ITO)	Provides transparent conductivity or electromagnetic shielding	Sheet resistance customizable
	Protective Coating	Provides extra protection against specific chemical environments
Application Fields		High-End Consumer Electronics: Smartphone camera covers, smartwatch crystals, fingerprint sensor covers. Industrial & Research: High-power laser windows, vacuum viewports, high-pressure/high-temperature viewports, spectrometer components. Aerospace & Defense: Missile domes, EO/IR pod windows, periscopes, armored vehicle viewports. Medical Devices: Endoscope protection lenses, surgical device windows, biosensors. Semiconductor Industry: Viewports for wafer processing equipment.