69-642 25mm Dia. x 75mm FL; Uncoated; Ge Plano-Convex Lens

The 69-642 is a 25mm diameter, 75mm focal length plano-convex lens, sourced from Edmund Optics. This lens is made of germanium burnett, a material known for its excellent optical properties, particularly in the infrared spectrum. The lens's plano-convex shape, where one side is flat and the other is curved, allows for efficient light focusing while maintaining a compact form factor.

The lens has a base shape of a circle, with a thickness of 2.65mm at the edge and 3mm at the center. The effective focal length (EFL) is 75mm, and the radius of curvature (R1) is 225.29mm. The back focal length (BFL) is 74.25mm, and the lens does not have any inner or outer radius, indicating a uniform thickness across the lens.

This lens is uncoated, meaning it does not have any additional layers to enhance its optical properties or protect it from environmental factors. While this may limit its performance in certain applications, it also makes the lens more cost-effective and suitable for use in systems where such coatings are not necessary.

The lens is designed to work with a wavelength of 10600nm, making it suitable for use in various infrared applications. Its spherical shape ensures consistent light refraction, making it an excellent choice for applications requiring high-quality imaging or light focusing.