SLB-15B-50NIR1 15.0 mm Dia. x -49.7 mm FL; Coated; Double-Concave Lens 633-1064nm

The SLB-15B-50NIR1 is a high-quality double-concave lens, 15.0 mm in diameter, designed for use within the wavelength range of 633-1064nm. This lens is sourced from the reputable optical components manufacturer, OptoSigma.

The lens is constructed from n-bk7 schott material, a popular choice due to its excellent optical properties and versatility. It features a base shape of a circle, with a thickness at the edge of 3.1mm and a center thickness of 2mm. The effective focal length (EFL) of this lens is -49.7mm, making it suitable for a variety of applications that require a negative focal length.

The curvature of the lens is defined by two radii, with the first radius (R1) being -51.9mm and the second radius (R2) being 51.9mm. These radii contribute to the double-concave geometry of the lens, which is characterized by having both sides curved inward. This design is particularly useful in applications where a reduction in beam diameter is required.

The lens is coated with Opt IR1 on both the front and back surfaces, enhancing its performance within the specified wavelength range. This coating helps to reduce reflection and increase transmission, thereby improving the overall efficiency of the optical system in which it is used.