LA1765-B N-BK7 Plano-Convex Lens; Dia:30.0 mm; f=75.0 mm ARC 650-1050nm

The LA1765-B is a high-quality plano-convex lens from Thorlabs, designed for use in a wide range of optical applications. This lens is fabricated from N-BK7, a popular glass type known for its excellent optical properties, and is specifically designed for use in the 650-1050nm wavelength range.

The lens has a diameter of 30.0 mm and a focal length of 75.0 mm, making it a versatile choice for many setups. The edge thickness is 2.5 mm, while the center thickness is 5.5 mm, providing a robust and durable construction. The front and back surfaces of the lens are coated with a broadband anti-reflection coating (tho b bbar), which enhances its transmission capabilities and reduces unwanted reflections.

The lens's geometry is spherical, with a radius of curvature of 38.6 mm on the convex side. The back focal length is 71.1 mm, and both the inner and outer radii are 0 mm, indicating a flat back surface. This lens is designed to be used in an unmounted configuration, providing flexibility in integration into various optical systems.