MgF2 Windows

MgF2 Windows
MgF2 Windows

MgF2 (Magnesium Fluoride) is positive uniaxial crystal with a very high optical transmittance from the vacuum UV to IR. It also has a large resistance to mechanical and thermal shock, to optical radiation, and is chemically stable, making it a very useful materials for UV and IR optics. 

Newlight Photonics offers both a-cut (or [100] cut) MgF2 windows for the maximum birefringence and c-cut (or cut along the optical axis) with the minimum birefringence.  Random-cut (cut along a random axis)  MgF2 windows are also available.  The thickness can be made as thin as 0.1mm.

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

Basic Properties of MgF2 Crystal

Transparency Range: 130 - 9000 nm

material-caf.GIF (11527 bytes)

Transmission Curve

Crystal Symmetry: Tetragonal
Lattice Constants: a= b=4.621 Å; c=3.053 Å
Density:  3.18 g/cm3
Thermo-Optic Coefficients (@20 degC, 632 nm)
dno/dT= 1.1 x 10-6 /oC
dne/dT= 0.58 x 10-6 /oC
Optical Homogeneity: Δn < 10-6 /cm
Mohs Hardness:  ~ 5
Thermal Conductivity:  11.6 W/m/K
Thermal Expansion Coefficients:   αa = 13.8 x 10-6 /K
  αc =  8.5 x 10-6 /K

Sellmeier Equations (λ in µm):
no2=1+0.48755λ2/(λ2-0.00188) + 0.39875λ2/(λ2- 0.00895)+2.31204λ2/(λ2- 566.136)
ne2=1+0.41344λ2/(λ2-0.00136) + 0.50498λ2/(λ2- 0.00824)+2.49045λ2/(λ2- 565.108)  

 Wavelength (nm) no ne Birefringence
Walk-off Angle
 at 45°
5000 1.3340 1.3428 0.023 -0.37°
2500 1.3642 1.3752 0.030 -0.45°
1064 1.3731 1.3847 0.032 -0.48°
800 1.3750 1.3867 0.032 -0.48°
632.8 1.3770 1.3888 0.032 -0.49°
532 1.3789 1.3907 0.033 -0.49°
355 1.3869 1.3991 0.034 -0.50°
266 1.3989 1.4116 0.035 -0.52°


Specifications of MgF2 Windows:

Orientation: a, c, random (-RM) or as specified
Dimension Tolerance: ±0.1 mm
Clear Aperture: > 85%
Parallelism: < 3 arc min.
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°


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