is the fluoride with the highest resistance to degradation by atmospheric moisture, also at higher temperatures. Its hardness, ruggedness and resistance to mechanical and thermal shock is advantageous for laser windows.
MgF2 has a low birefringence. The windows are fabricated with the optical axis as symmetry axis, minimizing the birefringence effect (c-cut).
LASEROPTIK's MgF2 substrates are very resistant to F-center formation due to their low O2- contamination, which is also expressed by the high VUV transmission.