Electro-optical phase modulation system

An electro-optical phase modulation system, comprising:

• an electro-optical crystal, a radio frequency circuit and a light source, wherein,
• a light incident surface of the electro-optical crystal is in parallel with a light exit surface thereof, an upper electrode surface of the electro-optical crystal is in parallel with and facing a lower electrode surface thereof, the light incident surface and the light exit surface are located between the upper electrode surface and the lower electrode surface, and an angle between the light incident surface and the upper electrode surface is a Brewster angle;
• two electrodes of the radio frequency circuit are connected to the upper electrode surface and the lower electrode surface respectively, for transmitting radio frequency signals to the upper electrode surface and the lower electrode surface, so that an electric filed, of which a direction is perpendicular to the upper electrode surface, is formed between the upper electrode surface and the lower electrode surface;
• the light source is located at a side of the light incident surface, and an incidence angle of a beam emitted from the light source with respect to the light incident surface is the Brewster angle.