Germanium Fluorophosphate
| Optical |
FROM |
TO |
| nF (486 nm) |
1.667 |
1.812 |
| nD (589 nm) |
1.665 |
1.786 |
| nC (656 nm) |
1.646 |
1.665 |
| Abbe number |
50 |
55 |
| Transparency range (nm) |
800 |
6000 |
| Luminescence yield |
60% |
75% |
| |
|
|
| Physical |
|
|
| Knoop hardness |
330 |
355 |
| Density (g/cc) |
3.85 |
4.3 |
| Chemical durability |
(stable/no leaching) |
| Tg © |
400 |
410 |
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