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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

material
aperture
thickness
Product Compare (0)
Model Name material aperture thickness Price Availability Action
CAW1010-C CaF2 window, square aperture 1"x1", thickness 1.0mm, C-cut ( [001]-cut ), polished only, uncoated CaF2 Square 1"x1" 1.0mm USD$369.00 Out Of Stock
CAF0020-C CaF2 crystal window, Dia. 12.7x2.0mm, <001>-cut, both surfaces polished and uncoated CaF2 Dia 0.5" 2.0mm USD$249.00 2-3 Days
CAF1010-C CaF2 crystal window, Dia. 25.4x1.0mm, <001>-cut, both surfaces polished and uncoated CaF2 Dia 1" 1.0mm USD$339.00
CAF1020-C CaF2 crystal window, Dia. 25.4x2.0mm, <001>-cut, both surfaces polished and uncoated CaF2 Dia 1" 2.0mm USD$359.00
CAF1030-C CaF2 crystal window, Dia. 25.4x3.0mm, <001>-cut, both surfaces polished and uncoated CaF2 Dia 1" 3.0mm USD$389.00
CAF1040-C CaF2 crystal window, Dia. 25.4x4.0mm, <001>-cut, both surfaces polished and uncoated CaF2 Dia 1" 4.0mm USD$389.00 2-3 Days
CAF1050-C CaF2 crystal window, Dia. 25.4x5.0mm, <001>-cut, both surfaces polished and uncoated CaF2 Dia 1" 5.0mm USD$449.00
CAF0005-RM CaF2 crystal window, Dia. 12.7x0.5mm, random cut, both surfaces polished and uncoated CaF2 Dia 0.5" 0.5mm USD$89.00 2-3 Days
CAF0020-RM CaF2 crystal window, Dia. 12.7x2.0mm, random cut, both surfaces polished and uncoated CaF2 Dia 0.5" 2.0mm USD$89.00 In Stock
CAF1005-RM CaF2 crystal window, Dia. 25.4x0.5mm, random cut, both surfaces polished and uncoated CaF2 Dia 1" 0.5mm USD$109.00 2-3 Days
CAF1010-RM CaF2 crystal window, Dia. 25.4x1.0mm, random cut, both surfaces polished and uncoated CaF2 Dia 1" 1.0mm USD$109.00 2-3 Days
CAF1020-RM CaF2 crystal window, Dia. 25.4x2.0mm, random cut, both surfaces polished and uncoated CaF2 Dia 1" 2.0mm USD$109.00 2-3 Days
CAW10075-RM CaF2 window, Aperture 1"x1", thickness 0.75mm, random cut, polished only, uncoated CaF2 Square 1"x1" 0.75mm USD$109.00 2-3 Days
CAF1030-RM CaF2 crystal window, Dia. 25.4x3.0mm, random cut, both surfaces polished and uncoated CaF2 Dia 1" 3.0mm USD$109.00
CAW15075-RM CaF2 window, Aperture 1.5"x1.5", thickness 0.75mm, random cut, polished only, uncoated CaF2 Square 1.5"x1.5" 0.75mm Ask Out Of Stock
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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:
 

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