SIGMAKOKI Spherical plano-concave lens, anti-reflection coating (750-1550nm) type, SLB series

It has a simple shape and can expand collimated laser light. It can be used in combination with a convex lens to expand the beam diameter or the irradiation area of the illumination light. It is a lens made of BK7 for the visible to near infrared range. Three types of lenses with anti-reflection coating are available: visible, near infrared, and infrared. You can select the lens that suits your specifications from a wide variety of variations subdivided by outer diameter size and focal length. * A concave lens cannot collect light or form a real image by itself. * Please use it in combination with a convex lens. * Spherical plano-concave lenses have chromatic aberration, and the focal length changes depending on the wavelength. * Plano-concave lenses have a direction in which light can enter. * Parallel light should be entered from the concave side. * If it is reversed, spherical aberration will increase and the optical performance of the optical system may deteriorate.