LD4269 12.7 mm Dia. UVFS Double-Concave Lens; EFL=-30mm Uncoated

The LD4269 is a spherical lens from Thorlabs, featuring a unique double-concave design with a diameter of 12.7 mm and a center thickness of 3 mm. This lens is specifically designed for use with a wavelength of 587.6 nm, making it suitable for a wide range of applications that require precise optical control in this spectrum.

The lens boasts an effective focal length (EFL) of -30 mm, which is a measure of the lens's ability to focus light. The negative value indicates that this is a concave lens, meaning it diverges light rays. This can be useful in applications where beam expansion is required.

The lens is made from UVFS material, identified as "UVFS mal- 1965" in the item data. This material is known for its transparency in the ultraviolet and visible spectra, making it ideal for use in applications such as UV-VIS spectroscopy, fluorescence microscopy, and other optical systems that operate in these wavelength ranges.

Notably, the lens is uncoated. While coatings can be used to enhance the performance of optical elements by reducing reflections, increasing transmission, or protecting surfaces, an uncoated lens can offer advantages in certain applications. For instance, uncoated lenses can be more cost-effective and are often more resistant to damage from environmental factors.