LB1811-C N-BK7 Bi-Convex Lens; Dia:1 in; f=35.0 mm ARC 1050-1700nm

The LB1811-C is a high-quality bi-convex lens, designed and manufactured by Thorlabs, a leading global supplier of photonics equipment. This lens boasts a diameter of 1 inch (25.4 mm) and a focal length of 35.0 mm, making it suitable for a wide range of optical applications.

The lens is crafted from N-BK7, a popular borosilicate glass known for its excellent optical properties. This material, also known as BK7, is renowned for its low dispersion and high transmission across a broad spectrum, from 350 nm to 2000 nm. The LB1811-C, in particular, is optimized for use in the ARC 1050-1700nm range, making it an ideal choice for near-infrared applications.

The lens features a spherical design, with both surfaces curved outwards. The first surface has a radius of curvature of 34.9 mm, while the second surface has a radius of -34.9 mm. This bi-convex design helps to minimize spherical aberration, ensuring optimal image quality.

The LB1811-C comes with anti-reflection coatings on both surfaces, further enhancing its performance. These coatings, designated as 'tho c bbar', are designed to reduce surface reflections and increase transmission, particularly in the ARC 1050-1700nm range.

In terms of dimensions, the lens has a thickness of 2 mm at the edge and 2.8 mm at the center. The inner radius is 0 mm, while the outer radius is also 0 mm. This lens is currently in stock, according to the vendor's website, and is ready for immediate use or integration into optical systems.