AL72525-E3 25.4 mm Dia. ZnSe AR coated Aspheric Lenses; EFL=25mm; NA=0.42 7-12µm

The AL72525-E3 is a high-quality aspheric lens, designed and manufactured by Thorlabs. This lens boasts a 25.4 mm diameter and is made from ZnSe (Zinc Selenide) material, specifically the ZnSe connolly variant. The lens is coated with a broadband anti-reflective (AR) coating, specifically the Thorlabs E3 BBAR 8 AOI coating, on both the front and back surfaces, enhancing its performance in the 7-12 µm wavelength range.

The lens features 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 a common issue in traditional spherical lenses. This design ensures that the lens delivers high-quality, distortion-free images.

The lens has a numerical aperture (NA) of 0.42, which is a measure of the lens' light-gathering ability. A higher NA allows for a wider angle of light collection, which can be beneficial in many applications. The lens also has a center thickness of 6 mm and an edge thickness of 3.8 mm, providing robustness and durability.

The item data also provides detailed information about the lens' geometry, including the inner and outer radii, as well as the coefficients of the aspheric surface. This data can be useful for those looking to integrate the lens into more complex optical systems.