Peoptix - Infrared Optics & Custom Optical Components
Peoptix - Infrared Optics & Custom Optical Components
Calcium Fluoride (CaF₂) Windows offer a low index of refraction, providing high transmission from 180nm - 10μm when used uncoated. To further increase transmission and reduce back reflections, a variety of AR coatings are available spanning wavelength regions from the Ultra-Violet (UV) to the Mid-Wave Infrared (MWIR).
Calcium Fluoride (CaF₂) Windows Material Properties
|
Material |
Calcium Fluoride (CaF₂) |
|
Transmission Range |
0.18 – 10.0 μm |
|
Refractive Index |
1.434 (nd) |
|
Density |
3.18 g/cm³ |
|
Coefficient of Thermal Expansion (CTE) |
18.85 × 10⁻⁶/°C |
|
Thermal Conductivity |
9.71 W/(m·K) |
|
Knoop Hardness |
158.3 (kg/mm²) |
|
Absorption Coefficient(1/cm) |
7.8 × 10⁻⁴ cm⁻¹ @ 2.7 μm |
|
Young's Modulus (GPa) |
75.8 GPa |
|
Poisson's Ratio |
0.26 |
|
Parameters |
Regular |
High precision |
|
Dimension |
Φ5mm – Φ350mm |
|
|
Diameter Tolerance |
±0.2mm |
±0.02mm |
|
Thickness Tolerance |
±0.2mm |
±0.05mm /±0.02mm |
|
Parallelism (arcmin) |
< 3′ (3 arcmin) |
< 3″ (3 arcsec) |
|
Surface Quality |
60-40 |
40-20 |
|
Surface Flatness (P-V) |
PV<2λ@632.8nm |
PV<λ/10@632.8nm |
|
Coating |
AR/AR@193nm, HR coating @193nm,AR@2-13 μm |
|
