MgF2
MgF2 single crystal is a birefrigent material
with particular properties. It has a high resistance to mechanical
and thermal shock and radiation. With wide transparent range
and high transmissibility, it becomes a popular choice for VUV
and excimer laser windows, polarizers, prisms, lenses, wedges,
windows, and other optical components.
| Basic Properties |
| Formula |
MgF 2 |
| Lattice Constant
|
a= 4.621A ; c= 3.053A
|
| Transmission range
|
0.13 - 7.0µm
|
| Density |
3.18 g /cm 3 |
| Melting point |
1255 °C |
| Hardness (Mohs) |
6 |
| Specific heat capacity
|
920 J kg -1 K -1
|
| Solubility in water
|
0.0076 g / 100 cm3
|
| Thermal expansion
coefficient (10 -6 /K) |
parallel c-axis:
10.86 - 14.54
vertical c-axis: 6.23 - 9.25 |
| Wavelength (µm)
|
0.2 |
0.5 |
1.0 |
3.0 |
5.0 |
7.0 |
| Refractive index
|
n o |
1.4231 |
1.3797 |
1.3736 |
1.3618 |
1.3400 |
1.3044 |
| n e |
1.4367 |
1.3916 |
1.3852 |
1.3724 |
1.3487 |
1.3101 |
| Absorption coefficient
(cm -1 ) |
0.07 at 0.2 µm;
0.02 at 5.0 µm |
Specifications:
Material: Magnesium Fluoride single crystal
Diameter Tolerance: +0.0, -0.1mm ,
Thickness Tolerance: ± 0.2mm
Clear Aperture: >80%
Parallelism: 1 arc minute
Flatness: λ /2 at 632.8 nm
Surface quality: 40-20 scratch and dig |
