SLB-50-70NIR2 50.0 mm Dia. x -70.0 mm FL; Coated; Plano-Concave Lens 750-1550nm

OptoSigma presents the SLB-50-70NIR2, a Plano-Concave Spherical Lens designed with a 50.0 mm diameter and a focal length of -70.0 mm. This lens is specifically coated for the near-infrared range of 750-1550nm, making it an excellent choice for applications within this spectrum.

The lens is fabricated from the renowned n-BK7 Schott glass, a material known for its excellent optical properties, including a high Abbe number and low auto-fluorescence. The Plano-Concave geometry, characterized by a flat front surface and a curved back surface, is designed to refract and diverge light. This makes the lens suitable for use in beam expanders, condensers, and other optical systems where light needs to be spread over a larger area.

The lens features a thickness of 13 mm at the edge and 3 mm at the center, providing robustness and stability. The inner and outer radii are 0 mm, indicating a sharp transition between the lens surfaces. The back focal length (BFL) is -72 mm, slightly longer than the effective focal length (EFL), which is -70 mm. This discrepancy is due to the thickness of the lens.

The lens is coated with Opt IR2 on both the front and back surfaces. This coating enhances the lens's performance in the near-infrared range, reducing reflection and increasing transmission. The coating status is "in stock," indicating immediate availability for your optical projects.