חדשות

Dielectric electroholographic gratings are electrically controlled Bragg gratings implemented by periodic striations that were produced during the crystal growth. The striations gratings are periodic modulation in the composition. In electrooptic paraelectric crystals these induce a periodic spatial modulation in the static (low frequency) dielectric constant, which upon the application of an external field induce a refractive index grating through the (quadratic) electrooptic effect.