The 88-809-INK is a Plano-Convex lens, a type of spherical lens, sourced from Edmund Optics. This lens, with a diameter of 9.0mm, is designed for use in the visible light spectrum, specifically at a wavelength of 587.6nm. The lens is made from n-sf11 Schott, a high-index glass with excellent optical properties.
The lens features a front and back coating of YAG-BBAR, a type of anti-reflection coating that operates within the 500-1100nm wavelength range. This coating reduces surface reflections, enhancing the lens's transmission capabilities. The lens's center thickness is 3.0mm, while its edge thickness is 1.38mm, providing a base shape that is circular.
The lens's effective focal length (EFL) is 9.0mm, and its front radius (R1) is 7.06mm. The back focal length (BFL) is 7.32mm, and the lens does not have an inner or outer radius. The lens's shape is spherical, and it is available for purchase from Edmund Optics. According to the vendor, the lens is currently in stock, making it a readily available option for your optical needs.
For more information, you can refer to the vendor's website at https://www.edmundoptics.com/f/yag-bbar-coated-plano-convex-pcx-lenses/14895/.