39-495 25.4mm Dia. ZnSe Aspheric Lens; EFL=50.8mm; NA=0.25 Uncoated

This is a high-quality 39-495 25.4mm Dia. ZnSe Aspheric Lens, sourced from the renowned optical components vendor, Edmund Optics. The lens is characterized by its uncoated surface and a focal length of 50.8mm, making it suitable for a wide range of optical applications.

The lens is made of ZnSe (Zinc Selenide) material, identified by the catalog number znse marple-1964. This material is known for its excellent transmission properties in the infrared region, making it ideal for applications such as IR spectroscopy, thermal imaging, and other infrared-based technologies.

The lens features a circular base shape with a diameter of 25.4mm. It has a center thickness of 3.5mm and an edge thickness of 2.38mm, providing robustness and durability. The lens's geometry includes an inner radius of 0mm and an outer radius of 0mm, indicating a symmetrical design.

The lens's geometry also includes a series of aspheric coefficients, namely k1 (-1.194332) and k2 (0), which contribute to its superior optical performance. These coefficients help correct spherical aberration, a common issue in traditional spherical lenses, thereby improving image quality and resolution.

The lens has a numerical aperture (NA) of 0.25, which determines the light-gathering capability of the lens. A higher NA allows for a wider angle of light collection, which is beneficial in applications requiring high light-gathering efficiency or high-resolution imaging.

The lens is uncoated, meaning it does not have any anti-reflective coatings. While this may result in higher reflective losses, it also means that the lens is less susceptible to damage from environmental factors, making it suitable for harsh environments.

The lens is currently in stock and available for purchase through the provided weblink. With its superior optical performance, robust design, and wide applicability, this 39-495 25.4mm Dia. ZnSe Aspheric Lens is an excellent choice for various optical applications.