49-591 15mm Dia. UVFS Aspheric Lens; EFL=15mm; NA=0.5 NIR 600-1050nm

This is the 49-591 model from Edmund Optics, a 15mm Dia. UVFS Aspheric Lens with a high numerical aperture (NA) of 0.5, specifically designed for the near-infrared (NIR) spectrum, covering the wavelength range of 600-1050nm.

The lens is made of high-quality UV fused silica (syn hpfs7980 corning), ensuring durability and excellent optical performance. It features a base shape of a circle, with a diameter of 15mm, making it suitable for a wide range of applications. The lens has a thickness of 2.43mm at the edge, and its effective focal length (EFL) is 15mm, which is the same as its diameter, indicating a compact and efficient design.

The lens's geometry is defined by its inner and outer radii, both of which are 0, suggesting a flat surface. The thickness at the center of the lens is 7.25mm, and it has an aspheric shape, which is characterized by its high-order aspheric coefficients (k1, k2, etc.). In this case, k1 is -2.076598, indicating a significant departure from a simple spherical shape, which allows for superior optical performance.

The lens is coated with Edmund Optics' NIR coating (600-1050nm) on both the front and back surfaces, enhancing its performance in the NIR spectrum. The coating specifications include an e front of 0.00057879951, an f front of -3.1626095e-06, a g front of 3.4718029e-08, an h front of -1.0192328e-10, and a j front and l front of 0, which are technical details that further define the coating's properties.