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MgF2 is a birefrigent material crystal with
excellent physical and chemical properties. It
provides wide transparent range, high
transmissibility. MgF2 is a rugged material resistant to chemical etching, mechanical, and thermal shock. High vacuum UV transmission and resistance to laser damage make MgF2 a popular choice for VUV and excimer laser windows, polarizers, and lenses.
Properties:
- Lattice constant: a=4.621Å; c=3.053Å
- Mohs hardness: 6
- Density: 3.17g/cm3
- Transparence range: 0.12 - 8.5µm
- Thermal conductivity: 0.0075W/m/K
- Expansion coefficient: aa=13.7x10-6/K;
ac=8.48x10-6/K
- Refraction Index: @405nm no=1.3836, ne=1.3957
Transmission Curve:
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Physical Properties
|
|
| Lattice
constant |
a=4.621A;
c=3.053A |
| Mohs
hardness |
6 |
| Melting
Point |
1255
°C |
| Density |
3.18g/cm3
(at
291K) |
| Transparence
range |
0.12
- 8.5mm |
| Thermal
conductivity |
0.0075W/m/K |
| Expansion
coefficient |
aa=13.7x10-6/K;
ac=8.48x10-6/K |
| Elastic Coefficients |
C11=140.2
C12=89.5
C44=56.8
C33=204.7
C13=62.9
C66=95.7
|
| Apparent Elastic Limit |
49.6 MPa (7200 psi)
|
| Poisson Ratio |
0.276
|
|
|
Optical Properties
|
|
| Transparence
range |
0.12-8.5mm |
| Absorption Coefficient |
40 x 10-3 cm-1 at 2.7µm |
| Reflection Loss |
5.2% at 0.6 microns (2 surfaces) |
| Restrahlen Peak |
20µm |
| dN/dT |
2.3 (parallel) & 1.7 x 10-6
(perp) at 0.4µm |
| dN/dµ |
= 0 1.4µm
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