Structure for overcoming polarity reversal in dual-ferroelectric-crystal-paired electro-optic device and using method

A structure for overcoming polarity reversal in a dual-ferroelectric-crystal-paired electro-optic device, wherein the structure is in a shape of a parallelogram and comprises a first crystal, a second crystal, a first reflector and a second reflector;

• wherein the first crystal, the second crystal, the first reflector, and the second reflector are all provided on a same metal plate, the first crystal and the first reflector are located at an upper side of the parallelogram, and the second crystal and the second reflector are located at a lower side of the parallelogram;
• the first reflector is configured to reflect a laser light transmitted through the first crystal to the second reflector at the lower side of the parallelogram, and the second reflector is configured to reflect the light to a light-transmitting face of the second crystal;
• and
• the first crystal and the second crystal are electro-optic crystals with ferroelectric properties, and metal electrodes are plated only on positive and negative polar faces of the first crystal, to which a voltage is applied.