CaF2 Windows

CaF2 Windows
CaF2 Windows CaF2 Windows

CaF2 (Calcium Fluoride) is a cubic crystal with an excellent transmission from 130 nm to 10 μm and has widespread applications as transparent windows in the ultraviolet and infrared spectra.Recently, CaF2 windows found a wide use for broadband continuum generation (white light generation) pumped by femtosecond lasers.

Newlight Photonics supplies [001] cut (i.e. the surface is perpendicular to the [001] axis) high quality CaF2 windows for continuum generation.
 CaF2 windows cut along a random orientation and polycrystalline CaF2 windows are also available.

Application Example:

CaF2 crystal used for stable femtosecond white light generation from UV to IR

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Part No. Aperture Thickness Orientation Coating Price Availability Add to Cart

Basic Properties of CaF2 Crystal:

Transparency Range: 130 - 9000 nm

material-caf.GIF (11527 bytes)

Transmission Curve

Crystal Symmetry: Cubic
Density: 3.18 g/cm3
Thermo-Optic Coefficients:
dn/dT= -13.1 x 10-6 /oC
Optical Homogeneity: Δn < 10-6/cm
Mohs Hardness:  4
Thermal Conductivity:  10 W/m/K
Thermal Expansion Coefficients: α = 18 x 10-6/K

Sellmeier Equations (λ in µm):
n2 = 1+ 0.56759λ2/(λ2 - 0.00253 ) + 0.47109λ2/(λ2-0.01001) + 3.84847λ2/(λ2-1200.56000)

Wavelength (nm) Index of refraction
5000 1.3989
2500 1.4211
1064. 1.4284
800 1.4305
632.8 1.4329
532 1.4353
400 1.4418
355 1.4458
266 1.4618
213 1.4850


Specifications of CaF2 Windows:


[001] (-C), random (-R) or as specified

Dimension Tolerance: ±0.1 mm
Clear Aperture: > 85%
< 10 arc sec (T>=2 mm)
< 60 arc sec (T=<1 mm)


λ/6 @ 632.8 nm

Surface Quality:

20/10 Scratch and Dig

Transmission Wavefront Distortion:

< λ/6 @632.8 nm

Bevel: < 0.25 mm X 45°


CaF2 windows are typically uncoated.
AR coating with R < 0.2% available upon request


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