BICV-FS11 25.4 mm Dia. x -75 mm FL; Uncoated; Double-Concave Lens

The BICV-FS11 is a high-precision double-concave lens, sourced from WTS Photonics, with a diameter of 25.4 mm and a focal length of -75 mm. This lens is designed for use in applications that require a concave-concave spherical lens with a circular base shape.

The lens's geometry is meticulously crafted, with an edge thickness of 4.35 mm and a center thickness of 2 mm. The effective focal length (EFL) is -75 mm, making it suitable for use in various optical systems. The first radius of curvature (R1) is -69.33 mm, while the second radius (R2) is 69.33 mm, indicating a symmetrical double-concave design. The back focal length (BFL) is 75.69 mm, and both the inner and outer radii are 0, suggesting a simple, straightforward design.

The lens is made from fused silica (mal-1965), a material known for its high transparency and resistance to thermal shock. It is designed to operate at a wavelength of 546.1 nm. Notably, this lens is uncoated, which may affect its performance in certain applications, particularly those requiring high transmission or resistance to environmental factors.