Optical Grade CaF2 Calcium Fluoride Window

Name: Optical Grade CaF2 Calcium Fluoride Window
Brand: Henan UM Optics Ltd
Availability: InStock

Description

High-performance calcium fluoride windows, fabricated from ultra-pure CaF₂ crystal for superior optical performance across UV, visible, and mid-infrared spectra (0.13–9 μm). These windows feature exceptional transmittance, low refractive index, and minimal thermal expansion, making them ideal for high-precision optical systems. We offer customizable sizes (diameters 5–200 mm, thickness 0.5–20 mm), edge treatments (beveled/rounded), and anti-reflective (AR) coatings optimized for specific wavelengths. With strict quality control (surface flatness ≤λ/10 @632.8 nm, scratch/dig 20/10), our factory-direct CaF₂ windows ensure consistent reliability for scientific, industrial, and aerospace applications.

Specifications

Substrate Material:	CaF2, IR Grade CaF2
Diameter:	25 mm
Surface Quality:	60-40 scratch-dig
Surface Flatness:	lambda/10, lambda/20, lambda/8, lambda/6, lambda/4, lambda/2, 1 lambda, Lambda/40
Thickness:	2 mm

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Features

Broad Spectral Transmittance: High transparency from deep UV (0.13 μm) to mid-IR (9 μm), with zero intrinsic birefringence, eliminating beam polarization distortion
Low Thermal Expansion: Coefficient of 1.89×10⁻⁶/°C, resisting thermal shock and deformation in extreme temperature environments
High Laser Damage Threshold: Suitable for high-power excimer lasers (193 nm/248 nm) and UV laser systems, with minimal absorption to avoid thermal lensing
Chemical Inertness: Non-hygroscopic and resistant to most acids (except strong alkalis), ideal for harsh laboratory and industrial settings
Customization Flexibility: Support for square/rectangular shapes, specialized coatings, and precision polishing for laser-grade and imaging-grade requirements

Applications

UV & Excimer Laser Systems: Used as protective windows in lithography tools, laser micromachining equipment, and UV spectroscopy setups
Infrared Imaging & Sensing: Integrated into thermal imaging cameras, FTIR spectrometers, and IR missile guidance systems (3–5 μm/8–12 μm bands)
Scientific Research: Employed in synchrotron radiation experiments, vacuum UV spectroscopy, and high-energy physics detectors
Aerospace & Defense: Utilized in satellite optical sensors and space-based IR telescopes, withstanding extreme vacuum and temperature conditions
Medical Devices: Applied in UV diagnostic equipment and laser surgery tools for high-precision light transmission.Q&A

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Ships from:

China

Sold by:

Henan UM Optics Ltd

On FindLight:

since 2024

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Frequently Asked Questions

Can CaF₂ windows be used in high-humidity environments?

Yes. CaF₂ is non-hygroscopic, meaning it does not absorb moisture from the air. Unlike some other optical crystals, it won’t fog or degrade even in long-term high-humidity conditions.

What coatings are recommended for CaF₂ windows in FTIR spectrometers?

For FTIR applications (2–8 μm), we recommend broadband AR coatings that reduce surface reflections to

Can you customize CaF₂ windows into non-standard shapes for my specialized optical device?

Absolutely. With in-house crystal growth and precision machining facilities, we support full customization of CaF₂ window shapes.