The SLB-20B-50NIR1 is a high-quality double-concave lens, boasting a diameter of 20.0 mm and a focal length of -49.7 mm. This lens is sourced from OptoSigma, a renowned vendor known for its precision optical components. The lens is made from n-bk7 schott, a material widely used in optical systems due to its excellent optical properties.
The lens features a base shape of a circle, with a thickness at the edge of 3.9 mm and a center thickness of 2 mm. The inner and outer radii are 0, indicating a uniform curvature. The effective focal length (EFL) is -49.7 mm, and the back focal length (BFL) is -50.3 mm. The radii of curvature for the first and second surfaces are -51.9 mm and 51.9 mm, respectively.
The SLB-20B-50NIR1 is coated with opt ir1 on both the front and back surfaces, enhancing its performance in the 633-1064nm wavelength range. This coating ensures high transmission and low reflection, making it suitable for various applications, including laser systems and imaging applications.