This is a Germanium Plano-Convex lens, sourced from Alkor Technologies, a renowned vendor in the optical industry. The lens has a diameter of 76.2 mm and a thickness of 3 mm at the edge, which gradually increases to 6.2 mm at the center. The effective focal length (EFL) of this lens is also 76.2 mm, making it a symmetrical lens in terms of its focal length and diameter.
The lens is made of Germanium, a material with a high refractive index and excellent transmission properties in the infrared region, specifically at a wavelength of 10600 nm. This makes it an ideal choice for applications that require the transmission of infrared light, such as thermal imaging, spectroscopy, and other scientific research.
The lens's shape is spherical, with a radius of curvature of 229.1 mm for the convex surface. The inner and outer radii are both zero, indicating that this lens does not have any additional shaping or contouring.
Notably, this lens is uncoated. While coatings can enhance the performance of lenses by reducing reflections, increasing transmission, or providing other benefits, an uncoated lens can be a cost-effective solution for applications where such enhancements are not necessary.
For more information about this lens, including its availability and pricing, please refer to the vendor's website at http://www.alkor.net/germanium_lenses.html.