39-477 25.4mm Dia. ZnSe Aspheric Lens; EFL=25.4mm; NA=0.5 Uncoated

This is a high-quality 39-477 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 25.4mm, making it suitable for a wide range of 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, specifically at 10600nm, making it an ideal choice for IR applications.

The lens geometry is defined by its inner and outer radii, both of which are 0 in this case. The diameter of the lens is 25.4mm, and it has a thickness of 2.29mm at the edge and 4.5mm at the center. The effective focal length (EFL) is 23.53mm, and the back focal length (BFL) is the same as the EFL due to the zero inner radius.

The lens features an aspheric shape, characterized by its aspheric coefficients k1 and k2, which are -1.005739 and 0, respectively. This shape allows for improved optical performance compared to traditional spherical lenses, particularly in terms of reduced spherical aberration.

The lens has a numerical aperture (NA) of 0.5, which indicates its light-gathering capability and resolution. It is uncoated, meaning it does not have any anti-reflective coatings. While this may result in higher reflective losses, it can be beneficial in certain applications where specific coatings may interfere with the desired spectral range or other performance characteristics.

According to the vendor's website, this item is currently in stock, ensuring quick delivery times. The item's weblink is valid and provides direct access to the product page for further information and purchasing.