87-975 12.5mm Dia. UVFS Aspheric Lens; EFL=10mm; NA=0.63 Uncoated

The 87-975 is a high-quality aspheric lens, 12.5mm in diameter, manufactured by Edmund Optics. This lens, designed for use in the ultraviolet spectrum, is made from UV fused silica, a material known for its excellent transparency in the UV range. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties.

The lens has a focal length (EFL) of 10mm, making it suitable for use in compact optical systems where space is at a premium. The numerical aperture (NA) of this lens is 0.63, indicating a wide acceptance angle and high light-gathering capability. This makes the lens ideal for applications that require high light throughput and excellent image quality.

The lens geometry is also noteworthy. It has an inner radius of 0mm, suggesting that it is a meniscus lens. The outer radius is also 0mm, indicating a symmetrical design. The thickness at the edge is 2.03mm, and the effective focal length (BFL) is 4.52mm. The lens center thickness is 8mm, and it has a conic constant (k1) of -0.6771756, indicating a mild aspheric shape.

The lens is designed to work at a wavelength of 587.6nm, which is in the yellow-green part of the visible spectrum. However, its high transparency in the UV range makes it suitable for use in UV applications.