AL72525-E1 25.4 mm Dia. ZnSe AR coated Aspheric Lenses; EFL=25 mm; NA=0.42 2-5µm

The AL72525-E1 is a high-quality aspheric lens, designed and manufactured by Thorlabs. This lens is made from ZnSe (Zinc Selenide) material, specifically identified as "znse connolly" in the material ID. The lens boasts a diameter of 25.4 mm and a center thickness of 6 mm, with an edge thickness of 3.8 mm.

The lens has an effective focal length (EFL) of 25 mm, making it suitable for a wide range of optical applications. The aspheric design of the lens helps to minimize spherical aberration, which is often a problem in traditional spherical lenses. The lens has a numerical aperture (NA) of 0.42, which is a measure of the light-gathering ability of the lens.

The lens is coated with Thorlabs' E1 Broadband Anti-Reflective (BBAR) coating, which is designed to reduce surface reflections and increase transmission over a broad range of wavelengths from 250 nm to 1100 nm. This coating is applied to both the front and back surfaces of the lens.

The lens is available for purchase directly from Thorlabs, and as per the provided data, it is currently in stock. For more detailed information, including technical drawings and performance data, please refer to the product's webpage on Thorlabs' official website.