SLB-50-220NM 50.0 mm Dia. x -220.0 mm FL; Coated; Plano-Concave Lens 400-700nm

The SLB-50-220NM is a Plano-Concave Spherical Lens, sourced from OptoSigma, with a diameter of 50.0 mm and a focal length of -220.0 mm. This lens is designed for use within the wavelength range of 400-700nm, making it suitable for a wide range of optical applications.

The lens is fabricated from n-bk7 Schott, a popular material in optical design due to its excellent optical properties and versatility. The lens features a plano-concave geometry, meaning one surface is flat while the other is curved inward. This particular design is often used to diverge or spread out light, making it ideal for use in applications such as beam expanders or optical coupling.

The lens has a thickness of 5.8mm at the edge and 3mm at the center. The inner and outer radii are both 0, indicating a uniform curvature across the lens surface. The back focal length (BFL) is -222mm, slightly longer than the effective focal length (EFL) of -220mm. This discrepancy is common in real-world lenses due to manufacturing tolerances and design considerations.

The lens is coated with Opt M on both the front and back surfaces. This coating enhances the lens's performance by reducing reflection and increasing transmission, thereby improving overall system efficiency.

According to the vendor's website, the lens is currently in stock, indicating its availability for immediate purchase and use. The provided weblink provides direct access to the vendor's product page, where users can find more detailed specifications, pricing information, and purchasing options.