The Gran Taylor polarizer consists of two birefringent crystals placed back-to-back with inclined surfaces facing each other. His two prisms have the same optical axis direction, parallel to the reflecting surface and perpendicular to the propagating beam. Due to the birefringence property of crystals, the refractive index of light waves propagating in the optical axis direction and perpendicular to the optical axis direction is different. The incident beam undergoes total internal reflection at the glass air interface at the prism junction: the reflected light includes all o-light and some e-light, while the transmitted light through the polarizer is highly linearly polarized e-light, which can be applied to scenes that require high-quality polarized beams. The use of an air gap structure between two birefringent crystals, rather than chemical bonding, increases the damage threshold and is suitable for medium power lasers with no escape window compared to the reflected light of the Glan laser. For high-power applications, a Gran laser crystal polarizing prism can be used.