the operation of an electro-optic used as a light-beam modulator is shown schematically in figure 2.
polarized light is incident on the modulator.
the light may be polarized originally or a polarized may be inserted,as shown.
the analyzer,oriented at 90 to the polarized,prevent any light from being transmitted when no voltage is applied to the electro-optic material.
when the correct voltage is applied to the device,the direction of the polarization is rotated by 90.then the light will pass through the analyzer