Faraday Rotator Glass - it's a special class of so called magneto-optical glasses which due to chemical formula (В2О3, Li 2O, Ce2O3 and other doping) possess of pronounced Faraday effect.


Faraday Rotation effect is that beam polarization turns round when going through the transparent optical medium placed into magnetic field. Be founded at 1846 it was only interesting physical fact until practice at the end of XX century.

This means at first Faraday magneto-optical switches, also modulators, circulators and other typical devices.

The main feature of Faraday rotation effect is optical nonreciprocity, i.e beam reversibility principle disturbance. Experience establishes that alternative beam direction (on the way back) gives the same polarization angle turning as forward one. So far the system of the magneto-optical medium element placed in crossed polarizers transparent in forward direction will be "closed" on the way back, so works as optical switch.

The angle of the Faraday rotation turning depends on the optical medium micro parameters and the measure of these is Verdet constant.

Thereby the magneto-optical glasses( Faraday Rotator Glasses ) have higher Verdet constant values in comparison with other optical mediums.

Due to the Verdet constant rates the FRG can be separated to several types: FRG04, FRG25, FRG32.