LD4271 9 mm Dia. UVFS Double-Concave Lens; EFL=-9mm Uncoated

The LD4271 is a spherical lens from Thorlabs, featuring a unique double-concave design. This lens is characterized by its 9 mm diameter and a center thickness of 2.5 mm. The effective focal length (EFL) of this lens is -9 mm, making it a negative or diverging lens.

The lens is made from UVFS material, specifically UVFS mal-1965. This material is known for its transparency in the ultraviolet, visible, and infrared spectra, making it suitable for a wide range of optical applications. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties or protect it from environmental factors.

The lens's geometry is defined by its inner and outer radii. In this case, both the inner and outer radii are 0, indicating that the lens is uniformly curved on both sides. The first radius of curvature (R1) is -8.7 mm, and the second radius of curvature (R2) is 8.7 mm. These radii, combined with the EFL, determine the lens's optical power and its ability to focus or diverge light.

The lens is designed to operate at a wavelength of 587.6 nm. This wavelength falls within the visible spectrum, specifically in the yellow-green region. This makes the LD4271 suitable for applications that involve visible light, such as imaging systems, beam shaping, and laser applications.