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Wed May 17 2017
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Magnesium Fluoride - MgF2 Crystal Window

MgF2 window - Magnesium Fluoride crystal is used for optical elements where extreme ruggedness and durability is required. MgF2 crystal transmission range is 0.11 µm - 8.5 µm. Irradiation does not lead to color centers. MgF2 crystal is a rugged, hard material which is resistant to thermal and mechanical shock and can be worked to the highest standards. Considerable mechanical shock is needed to cause cleavage which is near perfect when it occurs. MgF2 single crystals is a positive crystal and slightly birefringent and usually supplied with the optic axis cut perpendicular to the window faces.

MgF2 Crystal

Features of MgF2 crystal

- High optical transmittance from the vacuum ultraviolet to the infrared spectrum region(0.11~8.5µm)
- Resistant to mechanical and thermal shock, to radiation
- Chemically stable
- Used for Optical prisms, lenses, wedges, windows and other optical components
- A positive birefringent crystal used for polarization optics

MgF2 Crystal Properties

Crystal Type : Tetragonal, P42/mnm a=4.64 Å, c=3.06 Å
Density : 3.16 g/cm³
Melting Point : 1255 °C
Boiling point : 2239 °C
Thermal Conductivity : 3.15W/m K
Specific Heat : 920 J/(kg K)
Thermal Expansion : //C 9x10E-6; ⊥C 14x10E-6/ K
Hardness (Knoop) : 415,576 kg/mm²
Hardness (Mohs) : 5-6
Young's Modulus : 138.5 GPa
Elastic Coefficient : C11=140 C12=89 C44=57 C13=63 C66=96
Dielectric Constant : 105 ~ 107 Hz 5.45
Solubility in Water : 0.0076 g / 100 g, @18 °C
Absorption Coefficient : 0.07 at 0.2µm, 0.02 at 5.0µm
Transmission Range : 0.11 - 8.5 µm
Fluorescence : Weak yellow upon excitation at 590 nm
Temperature coefficient of refractive index: dno/dT = 2.3 x 10-6 @ 497.4 nm

MgF2 Refractive Index vs Wavelength

λ (nm) no ne λ (nm) no ne
121 1.62750 1.63200 656 1.37661 1.38835
140 1.50950 1.52300 1000 1.37964 1.38521
178 1.43975 1.45365 2000 1.36800 1.37922
436 1.38203 1.39402 3000 1.36000 1.37060
488 1.38016 1.39206 4000 1.35750 1.36200
546 .37855 1.39039 5000 1.33020 1.33930
588 1.37770 1.38960 7000 1.30870 1.31010

MgF2 Crystal Specifications

Material: VUV grade MgF2
Transmittance: 50% @ 120nm, 60% @ 140nm, 90% @ 200nm, 93% @ 300-5000nm.
Diameter Tolerance : +0.0/-0.1mm
Thickness Tolerance : +0/-0.1mm
Clear Aperture : Central 90% of diameter
Surface Quality : 20 - 10
Parallelism : 20 arc seconds
Surface Flatness : per 25mm λ/10
Chamfer 0.15~0.35mm x 45°

MgF2 Crystal Order Information

OptoCity offer MgF2 single crystal with high transmittance in DUV/VUV for large single domain size, and especially suitable for Excimer or DUV/VUV windows.

We can produce MgF2 Blank, MgF2 Windows, MgF2 Lenses, MgF2 Cylindrical Lenses, MgF2 Prisms etc. according to custmers' requirments.

i.

1. MgF2 Crystal

MGF12-2, Ø12.7 x 2 mm MgF2 Window

$99.00


MGF25-2, Ø25.4 x 2 mm MgF2 Window

$99.00


MGF25-3, Ø25.4 x 3 mm MgF2 Window

$99.00


MGF50-4, Ø50.8 x 4 mm MgF2 Window

$99.00


Additional message: qty. wavelength, holder...

ii.

MgF2 Crystal Inquiry

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