84-337 25mm Dia. UVFS Aspheric Lens; EFL=20mm; NA=0.63 UV-VIS 250-700nm

The 84-337 is a high-performance aspheric lens, designed and manufactured by Edmund Optics. This lens boasts a 25mm diameter and a numerical aperture (NA) of 0.63, making it a versatile choice for a wide range of optical applications.

The lens is crafted from UV-grade fused silica, a material known for its excellent transparency across the UV-VIS spectrum (250-700nm). This material choice ensures high-quality image transmission and minimal optical distortion. The lens's design includes a UV-VIS coating on both the front and back surfaces, further enhancing its transmission capabilities and protecting it from environmental hazards.

The 84-337 features a unique aspheric shape, which is characterized by its non-spherical surface. This design significantly reduces spherical aberration, a common issue in spherical lenses that can lead to distorted images. The lens's geometry includes an inner radius of 0mm, an outer radius of 0mm, and a thickness at the edge of 2.27mm. The effective focal length (EFL) is 20mm, and the back focal length (BFL) is 10.4mm.

The lens's geometry also includes a series of aspheric coefficients (k1, k2) that define its precise shape. The k1 coefficient is -1.102626, and the k2 coefficient is 0. The lens's thickness at the center is 14mm. The front surface has an e-flate of 8.791869e-05, a f-flate of 3.051652e-07, a g-flate of -7.950597e-10, and an h-flate of 8.042043e-12. The j-flate and l-flate are both 0.