87-955 25 mm Dia. Germanium Positive Meniscus Lens; EFL=25mm Uncoated

This is a 25 mm diameter Germanium positive meniscus lens, sourced from the reputable vendor Edmund Optics. The lens is uncoated and features a focal length of 25mm, making it suitable for a wide range of optical applications.

The lens geometry is characterized by a thickness of 1.3mm at the edge and 2.5mm at the center. The radii of curvature for the first and second surfaces are 28.32mm and 42.46mm respectively, resulting in a back focal length of 23.34mm. The lens is designed to be spherical, ensuring high-quality imaging and light transmission.

The lens is made of Germanium, a material with a high refractive index and excellent transmission properties in the infrared region, specifically at 10600nm. This makes the lens ideal for applications such as infrared spectroscopy, thermal imaging, and other infrared-based technologies.

The lens is uncoated, which means it does not have any additional layers to enhance its optical properties or protect it from environmental factors. However, uncoated lenses can offer superior optical performance in specific applications, making them a preferred choice for some users.

Please note that the lens data indicates that the inner and outer radii are both zero, suggesting that this lens is a meniscus lens with a single spherical surface. This further emphasizes its suitability for applications that require a simple, high-performance lens.