Nonlinear crystals with Type I phase matching are essential for frequency conversion applications, including second harmonic generation and optical parametric oscillation. These crystals exhibit surface quality ranging from 20-10 to 10-5 scratch-dig, ensuring high optical performance. Suppliers such as CRYSTECH Inc. and Union Optic offer a variety of options, including BBO and KTP crystals. On FindLight, you can compare technical specifications, request pricing, and connect directly with manufacturers without needing to register.