Biconcave Lens (BK7) / SLB-30B-35N

▶Biconcave lenses are negative lenses that diverge collimated incident light and are primarily used in conjunction with convex lenses to shape beams.
▶The biconcave lens has chromatic aberration, and the focal length will vary depending on the wavelength. Please check the wavelength characteristic of the focal length data for the focal lengths of each wavelength.
▶Transmissions losses due to reflection off the front and rear surfaces of the lens can be minimized by coating the surfaces. Consult our Sales Division for anti-reflection coatings suitable for your application.
▶ Sharpe edges are common in negative lenses are removed by beveling in order to reduce chipping may result in smaller then edge thickness. Thicknesses listed in tables are to theoretical sharp edge.