CaF2 Low Dispersion, Low B-Integral CaF2 Vacuum Windows. Calcium fluoride features a very low spectral dispersion, a low non-linear refractive index. Calcium fluoride shows good optical and thermo-mechanical properties. It is widely used as optical windows, lenses and prisms in 0.13μm~9.0μm. For its optical isotropy, low absorption and low refractive index. CaF2 has found unique […]