G313374525 12.7 mm Dia. N-BK7 Double-Concave Lens; EFL=-50mm 725-1050nm

This is a G313374525 Double-Concave Lens, sourced from the renowned optical components manufacturer, Qioptiq Photonics. The lens, which is 12.7 mm in diameter, is made of N-BK7, a popular borosilicate glass known for its excellent optical properties.

The lens features a double-concave geometry, characterized by its two concave surfaces. The first surface has a radius of curvature (R1) of -52.33 mm, while the second surface has an R2 of 52.33 mm. This specific configuration results in an effective focal length (EFL) of -50 mm, making it suitable for applications that require a negative focal length.

The lens has a center thickness of 1.5 mm, and its inner and outer radii are both zero, indicating a symmetrical design. The lens is designed to operate within the wavelength range of 725-1050 nm, making it suitable for near-infrared applications.

The lens comes with a broadband anti-reflection coating on both the front and back surfaces. The coating, identified as 'qio bbar arb2nirnbk7', is specifically designed to minimize reflection losses within the specified wavelength range. This coating ensures high transmission and low scatter, enhancing the overall performance of the lens.