Birefringence Filter (Interferential Polarization)

Birefringence (interferential polarization) filters are spectral devices of high spatial resolution. Exceptional abilities regarding transition bandwidth reduction, the enhancement of contrast, the increase of both angular and linear field of view and scanning range on the spectrum stipulated a wide use of interferential polarization filters. They are successfully used in optical instrument-making, quantum electronics, spectroscopy, astronomy, geophysics and other fields.