This is a 38.1 mm diameter Silicon Plano-Convex lens, sourced from Alkor Technologies, with an effective focal length (EFL) of 200mm. The lens is uncoated, which means it does not have any additional layers to protect or enhance its optical properties.
The lens's geometry is characterized by a thickness of 2mm at the edge and 2.4mm at the center. The inner and outer radii are both zero, indicating a plano-convex shape. The radius of curvature (R1) is 483.1mm.
This lens is made of silicon, specifically silicon sal vil 1957, and is designed to work with a wavelength of 10600nm. The material ID is provided for users who may need to cross-reference or match this lens with other components in their system.
Please note that the vendor, Alkor Technologies, lists this item as in stock on their website (http://www.alkor.net/silicon_lenses_pcx.html), making it readily available for immediate use.