LC5401 25.4 mm Dia. CaF2 Plano-Concave Lens; EFL=-75mm Uncoated

The LC5401 is a plano-concave lens with a diameter of 25.4 mm, sourced from the reputable optical components manufacturer, Thorlabs. This lens is made from Calcium Fluoride (CaF2) material, specifically identified as "caf2 mal-1963" in the material database.

The lens features a significant negative focal length of -75 mm, making it suitable for applications that require strong negative refraction. The geometry of the lens includes a center thickness of 2.5 mm, with both the inner and outer radii being zero, indicating a plano surface on one side and a concave surface on the other.

Despite the absence of any coating information in the provided data, it's worth noting that Thorlabs offers a variety of coating options for their lenses, including anti-reflection coatings, which can be beneficial in reducing unwanted reflections and increasing transmission.

This lens is designed to operate at a wavelength of 588 nm, aligning with the green region of the visible light spectrum. Its spherical shape allows for a wide range of applications, from imaging to beam shaping, and its uncoated state provides a baseline for users to add their desired coatings based on their specific application requirements.