BBO crystal is an excellent electro-optic crystal for high power applications at the wavelength range from 200nm to 2500nm. BBO has a high damage threshold and a low dielectric constant and is useful in high repetetion rate, high average power (up to 150W) diode pumped solid state lasers (DPSS lasers). BBO has significant advantages over other materials in terms of laser power handling abilities, temperature stability, and substantial freedom from piezoelectric ringing. BBO has electro-optic coefficients g11=2.7pm/v, g22, g31<0.1g11. It can be used for Q-Switching a cw diode pumped Nd:YAG laser with average power>50W.