LBTEK's Laser Line Polarizing Beamsplitter Cubes are made from two UV Fused Silica right-angle prisms, with a dielectric beamsplitter coating that reflects s-polarized light and transmits p-polarized light. While any of the four sides of the cube can function as an entrance face to separate p- and s-polarized light, it is highly recommended to direct the incident light into the leg of the prism that features the beamsplitter coating to achieve optimal polarization performance. (The prism with a black dot on top indicates that its hypotenuse is coated with the dielectric polarizing beamsplitter coating.) These cubes offer an extinction ratio of Tp:Ts > 3000:1. All four entrance/exit faces are coated with a V-type anti-reflection (AR) coating specifically designed for a single wavelength, ensuring a reflectance of less than 0.25% @ design wavelength. LBTEK provides 10 standard design wavelengths, including 405 nm, 532 nm, 633 nm, 780 nm, 808 nm, 830 nm, 850 nm, 1030 nm, 1064 nm, and 1550 nm. Customization services for other design wavelengths and dimensions are also available. For specific inquiries, please contact LBTEK Technical Support.