Electro-optic Modulator

Electro-optic modulator (EOM) is an optical device in which a signal-controlled element exhibiting the electro-optic effect is used to modulate a beam of light. The modulation may be imposed on the phase, frequency, amplitude, or polarization of the beam. Modulation bandwidths extending into the gigahertz range are possible with the use of laser-controlled modulators.

The electro-optic effect is the change in the refractive index of a material resulting from the application of a DC or low-frequency electric field. This is caused by forces that distort the position, orientation, or shape of the molecules constituting the material. Generally, a nonlinear optical material (organic polymers have the fastest response rates, and thus are best for this application) with an incident static or low frequency optical field will see a modulation of its refractive index.

AdvR's optical modulators (High Power Fiber Coupled Optical Phase Modulators)  take advantage of the electro-optic properties of nonlinear optical materials KTP & Mg:LN. These materials can manipulate a laser input without the use of mechanical components. The single element beam control results in rapid, programmable modulation with low optical loss. 
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