Effect of polarization on the properties of an induced χ(2) tensor in bulk glass

The tensor properties of χ⁽²⁾ gratings written in bulk glass have been studied for various polarization conditions. Three basic cases were studied: the writing of gratings by waves with parallel polarizations, perpendicular polarizations, and polarizations making an angle of 45°. The results indicate that a static electric field proportional to (EE)E is written.