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.	Description	Application	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	Price	Availability	Add to Cart

Basic Properties of CaF₂ Crystal:

Transparency Range: 130 - 9000 nm	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:

Orientation:	[001] (-C), random (-R) or as specified
Dimension Tolerance:	±0.1 mm
Clear Aperture:	> 85%
Parallelism:	< 10 arc sec (T>=2 mm) < 60 arc sec (T=<1 mm)
Flatness:	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°
Coatings:	CaF₂ windows are typically uncoated. AR coating with R < 0.2% available upon request

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