The invention provides a biaxial-
crystal electro-optical Q switch and a fabrication method thereof. The biaxial-
crystal electro-optical Q switch is made of an integrated rectangular biaxial-
crystal electro-optical crystal, a
phase compensation wave plate is arranged at a central position of a light through direction of the electro-optical Q switch, electro-optical crystal components are arranged at parts of two sides of the
phase compensation wave plate of the electro-optical Q switch,
electrode plates are electroplated on two c surfaces, which extend along the light through direction and are parallel to each other, of each electro-optical component, the length of the
phase compensation wave plate in the light through direction is odd times of the thickness of the phase compensation plate which is used for generating phase
delay on a target
laser, and the lengths of the two electro-optical crystal components are same. By the biaxial-crystal electro-optical Q switch, the temperature stability of the Q switch can be effectively and reliably improved, the Q switch is low in
insertion loss and is simple to operate, the influence on the temperature stability of the Q switch caused by change of static
birefringence of the biaxial-crystal electro-optical crystal with a temperature can be solved, and the inherent
extinction ratio of the electro-optical Q switch is also ensured.