SLB-20B-40PIR2 20.0 mm Dia. x 40.7 mm FL; Coated; Double-Convex Lens 750-1550nm

The SLB-20B-40PIR2 is a high-quality lens from OptoSigma, designed for use in the 750-1550nm wavelength range. This lens is a Spherical Lens (Convex-Convex) type, featuring a base shape of Circular for versatile application.

The lens has a diameter of 20.0 mm and a thickness edge of 2.0 mm, ensuring durability and stability. The thickness center measures 4.4 mm, providing a balanced structure for optimal performance. The effective focal length (EFL) of this lens is 40.7 mm, making it suitable for a variety of optical applications.

The curvature of the lens is defined by its first and second radii, R1 and R2, which are 41.52 mm and -41.52 mm respectively. These radii contribute to the lens's double-convex shape, which is designed to minimize spherical aberration and provide superior image quality. The back focal length (BFL) of the lens is 39.3 mm, which should be considered when designing optical systems.

The lens is made from n-bk7 schott material, a popular choice for its high refractive index and low dispersion. This material ensures excellent optical performance and durability.

The lens features a coating on both the front and back surfaces. The coating is opt ir2, which is specifically designed for use in the infrared spectrum. This coating enhances the lens's performance in the 750-1550nm wavelength range, reducing reflection and increasing transmission.