Calcium Fluoride Optical Windows

Calcium Fluoride optical windows are transparent from 180 nm to 8 µm, making them ideal for applications such as spectroscopy or fluorescence imaging in the UV, visible, and IR wavelengths.

Ideal for excimer laser applications
Low absorption and high damage threshold
Transparent in UV, Visible, and IR
<1 arc-minute parallelism
Low chromatic aberration compared to other IR materials

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Showing 11 of 11 total products

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Description	Compatibility	Material	Diameter	Thickness	Surface Flatness	Parallelism	Price
10CF20Optical Window, Calcium Fluoride, 25.4 mm Dia., 2.0 mm thick, Uncoated	UNIVERSAL	IR Grade Calcium Fluoride	25.4 mm	2.0 mm	λ/20 @ 10.6 µm	< 3 arc minute	$290
10CF30Optical Window, Calcium Fluoride, 25.4 mm Dia., 3.0 mm thick, Uncoated	UNIVERSAL	IR Grade Calcium Fluoride	25.4 mm	3.0 mm	λ/20 @ 10.6 µm	< 3 arc minute	$237
CAW10Optical Window, Calcium Fluoride, 5.0 mm Dia., 1.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	5.0 mm	1.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$120
CAW11Optical Window, Calcium Fluoride, 10.0 mm Dia., 1.5 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	10.0 mm	1.5 mm	λ/2 @ 632.8 nm	< 1 arc minute	$138
CAW12Optical Window, Calcium Fluoride, 12.5 mm Dia., 2.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	12.5 mm	2.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$151
CAW13Optical Window, Calcium Fluoride, 15.0 mm Dia., 2.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	15.0 mm	2.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$172
CAW14Optical Window, Calcium Fluoride, 25.0 mm Dia., 3.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	25.0 mm	3.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$189
CAW15Optical Window, Calcium Fluoride, 50.0 mm Dia., 3.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	50.0 mm	3.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$378
CAW16Optical Window, Calcium Fluoride, 20.0 mm Dia., 2.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	20.0 mm	2.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$182
CAW17Optical Window, Calcium Fluoride, 30.0 mm Dia., 3.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	30.0 mm	3.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$301
CAW18Optical Window, Calcium Fluoride, 40.0 mm Dia., 3.0 mm thick, Uncoated	UNIVERSAL	Vacuum UV Grade Calcium Fluoride	40.0 mm	3.0 mm	λ/2 @ 632.8 nm	< 1 arc minute	$341

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Specifications

Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Cleaning
See How to Clean Optics
Clear Aperture
CAW: central 90% of diameter
10CF: central 85% of diameter

Diameter Tolerance
CAW: +0.0/-0.1 mm
10CF: ±0.20 mm
Thermal Expansion Coefficient
18.9 x 10^-6 K^-1 @ 300 K
Thermal Limit
10 W m^-1 K^-1 @ 273 K
Wavelength Range
250-7000 nm

Features

Ultra Broadband Applications

Calcium Fluoride has both high average transmission and low chromatic aberration compared to most IR materials. Unlike Germanium and Silicon, it is also transparent in the UV and Visible wavelength ranges, making it suitable for applications such as fluorescence imaging, or spectroscopy where operation over many wavelength bands is essential. Other application examples include use in femtosecond IR systems due to low group velocity dispersion in the IR) and use in excimer laser systems due to low UV absorption and high damage threshold).

Low Dispersion

The refractive index of Calcium Fluoride is remarkably stable vs wavelength. Visible chromatic aberration is extremely low with an Abbe Number of 95.31 compared to N-BK7 at 64.17, which means that this material is great for imaging applications. In the infrared region CaF2 is an excellent material to use in ultrafast experiments as it has the lowest group velocity dispersion (GVD) of any IR Material at 1.77 fs2/mm. This is half the GVD of Magnesium fluoride and orders of magnitude lower than Germanium or Silicon.