LE1234-A 25.4 mm Dia. N-BK7 Positive Meniscus Lens; EFL=100mm 350-700nm

The LE1234-A is a 25.4 mm diameter Spherical Lens with a Positive Meniscus shape, sourced from Thorlabs. This lens is designed for use in the visible spectrum, specifically optimized for wavelengths around 587.6 nm. The lens is made from N-BK7, a popular glass type known for its excellent optical properties, particularly its high refractive index and low dispersion.

The lens features a double-sided anti-reflection coating, denoted as 'tho a bbar' for both the front and back surfaces. This coating is designed to reduce surface reflections and increase transmission, thereby enhancing the overall efficiency and performance of the lens.

The lens geometry includes a center thickness of 3.6 mm and an edge thickness of 2 mm. The effective focal length (EFL) is 100 mm, and the back focal length (BFL) is 95.9 mm. The first and second radii of curvature (R1 and R2) are 32.1 mm and 82.2 mm, respectively. The lens has no inner or outer radius, indicating a full circular shape.

This lens is available for purchase directly from Thorlabs, and as per their website, it is currently in stock. The link to the product page is provided for your convenience.