Optical Grade CaF2 Calcium Fluoride Window

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

Description

Calcium Fluoride (CaF₂) windows are industry-leading high-performance optical components, boasting extraordinary broad-spectrum transparency spanning deep ultraviolet (180 nm) to mid-infrared (8 μm) wavelengths—with virtually zero absorption across this critical range. Their non-hygroscopic structure and ultra-low chromatic aberration eliminate signal distortion, delivering unrivaled accuracy for demanding precision setups. Engineered for resilience, they feature exceptional mechanical stability and robust chemical inertness, retaining peak performance in harsh environments. Ideal for deep ultraviolet spectroscopy, high-power lasers, semiconductor lithography, and advanced scientific research.

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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China

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Henan UM Optics Ltd

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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.