LBTEK Narrowband Polarizing Beamsplitter Cube Kit is composed of two Right-Angle Prisms, one of which has a dielectric polarizing Beamsplitter Coating on its hypotenuse. The dielectric Beamsplitter Coating can reflect S-polarized light and transmit P-polarized light, achieving separation of P-polarized light and S-polarized light along the transmission direction and the 90° reflection direction. Compared with broadband Polarizing Beamsplitter Cubes, the Beamsplitter Coating and Antireflection Coating (AR Coating) of narrowband products are optimized for a defined wavelength range, enabling a higher Extinction Ratio (ER) (Tp:Ts > 2000:1) and better beamsplitting performance within the wavelength range. The Narrowband Polarizing Beamsplitter Cube Kit consists of 10 Polarizing Beamsplitter Cubes with the same wavelength range and 12.7×12.7×12.7 mm dimensions, and the wavelength range covers five commonly used wavelength ranges in the field of Quantum Technologies precision measurement: 420-495 nm, 505-680 nm, 620-795 nm, 800-950 nm, and 975-1100 nm. In addition to the standard Narrowband Polarizing Beamsplitter Cube Kit, LBTEK also provides a variety of custom solutions, including custom special sizes, wavelength ranges, Extinction Ratio (ER), and other specifications. For specific custom requirements, please contact LBTEK technical support.