OptoSigma offers the SLB-25-200NIR2, a Plano-Concave Spherical Lens with a 25.0 mm diameter and a focal length of -200.0 mm. This lens is designed for use within the wavelength range of 750-1550nm, making it suitable for near-infrared (NIR) applications.
The lens is made from n-BK7 Schott, a widely used optical glass due to its excellent optical properties. The lens features a plano-concave geometry, meaning one side is flat, and the other side is curved inward. This particular lens has an inner radius of 0 mm and an outer radius of 0 mm. The edge thickness measures 2.8 mm, while the center thickness is 2 mm.
The SLB-25-200NIR2 comes with a broadband anti-reflection coating, specifically the opt IR2 coating, on both the front and back surfaces. This coating enhances the lens's performance by reducing surface reflections, thereby increasing transmission.