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MgF2 (Magnesium Fluoride) is used for optical elements in both the infrared and ultraviolet. Its useful transmission range is from 0.11um to 7.5um. It is the only one optical material combining wide spectral transmittance band with birefringence phenomenon. MgF2 is one of the lowest index infrared materials, second only to Lithium Fluoride. It is resistant to thermal and mechanical shock. The material is twice as hard as Calcium Fluoride but only half as hard as Germanium.
MgF2 Characteristics & Transmission Curve 
Bluebean Optical's MgF2 Lenses specifications:
|
Material |
MgF2 |
|
Design Wavelength |
200nm,486nm,633nm, 2.0um |
|
Focal Length Tolerance |
±2% |
|
Diameter Tolerance |
+0.0/- 0.1 mm |
|
Thickness Tolerance |
±0.2mm |
|
Surface Accuracy |
λ/2@632.8nm |
|
Surface Quality |
60-40 |
|
Centration |
3 arc min |
|
Clear aperture |
> 80% |
|
Bevel |
0.2mm×45° |
|
Coating |
upon request |
MgF2 Plano-convex Spherical Lenses:
|
Part No. |
Dia |
EFL |
R |
Tc |
Te |
BFL(200nm) |
|||
|
200nm |
486nm |
633nm |
2.0μm |
||||||
|
PCXM25050 |
25.4 |
44.64 |
49.68 |
50.1 |
51.35 |
18.89 |
6.9 |
2 |
39.79 |
|
PCXM25075 |
25.4 |
66.83 |
74.36 |
75 |
76.86 |
28.27 |
5 |
2 |
63.31 |
|
PCXM25100 |
25.4 |
89.37 |
99.45 |
100.3 |
102.79 |
37.81 |
4.3 |
2.1 |
86.35 |
|
PCXM25150 |
25.4 |
133.74 |
148.83 |
150.1 |
153.83 |
56.58 |
3.2 |
1.8 |
131.49 |
|
PCXM25200 |
25.4 |
178.2 |
198.31 |
200 |
204.97 |
75.4 |
3.2 |
2.1 |
175.96 |
|
PCXM25250 |
25.4 |
222.84 |
247.98 |
250.1 |
256.32 |
94.28 |
2.8 |
1.9 |
220.88 |
|
PCXM25500 |
25.4 |
445.51 |
495.76 |
500 |
512.43 |
188.49 |
2.6 |
2.2 |
443.68 |
|
PCXM25101 |
25.4 |
891.02 |
991.53 |
1000 |
1024.87 |
376.98 |
2.4 |
2.2 |
889.34 |