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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.

material
aperture
thickness
Product Compare (0)
Model Name material aperture thickness Price Availability Action
MGF0001-A MgF2 crystal window, Dia. 0.5"x0.1mm, A-cut, both surfaces polished and uncoated MgF2 Dia 0.5" 0.1mm Ask Out Of Stock
MGF0005-A MgF2 crystal window, Dia. 0.5"x0.5mm, A-cut, both surfaces polished and uncoated MgF2 Dia 0.5" 0.5mm USD$279.00 Out Of Stock
MGF0010-A MgF2 crystal window, Dia. 0.5"x1.0mm, A-cut, both surfaces polished and uncoated MgF2 Dia 0.5" 1.0mm USD$309.00 Out Of Stock
MGF1002-A MgF2 crystal window, Dia. 1"x0.2mm, A-cut, both surfaces polished and uncoated MgF2 Dia 1" 0.2mm Ask
MGF10025-C MgF2 crystal window, Dia. 1"x0.25mm, C-cut, both surfaces polished and uncoated MgF2 Dia 1" 0.25mm USD$409.00
MGF1005-A MgF2 crystal window, Dia. 1"x0.5mm, A-cut, both surfaces polished and uncoated MgF2 Dia 1" 0.5mm USD$409.00
MGF25005-RM MgF2 crystal window, Dia. 25.0x0.5mm, Rondom cut, both surfaces polished and uncoated MgF2 Dia 25.0mm 0.5mm Ask
MGF1010-A MgF2 crystal window, Dia. 1"x1.0mm, A-cut, both surfaces polished and uncoated MgF2 Dia 1" 1.0mm USD$409.00
MGF1020-A MgF2 crystal window, Dia. 1"x2.0mm, A-cut, both surfaces polished and uncoated MgF2 Dia 1" 2.0mm USD$409.00
MGF1020-RM MgF2 crystal window, Dia. 1"x2.0mm, Random cut, both surfaces polished and uncoated MgF2 Dia 1" 2.0mm USD$299.00
MGF1030-A MgF2 crystal window, Dia. 1"x3.0mm, A-cut, both surfaces polished and uncoated MgF2 Dia 1" 3.0mm Ask
MGF1050-A MgF2 crystal window, Dia. 1"x5.0mm, A-cut, both surfaces polished and uncoated MgF2 Dia 1" 5.0mm Ask
LIF1020-A LiF crystal window, Dia. 1"x2.0mm, A-cut ( <100>-cut ), both surfaces polished and uncoated LiF Dia 1" 2.0mm USD$299.00
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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
(Δn=ne-no)		 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°