An electro optic modulator is a device that contains some kind of material that displays the electro optic effect. This means something inside this device, most likely a crystal of some kind has its optical properties change when a voltage is applied across it. This change in the crystal allows the laser beam traveling through it  to also change “modulating it”. This modulation can change things such as amplitude and phase among other things. My  project is  going to be investigating into how an electro optic modulator works.