13-497 12.5mm Dia. S-LAH64 NIR Aspheric Lens; EFL=10mm; NA=0.63 Uncoated

This is the 13-497 model from Edmund Optics, a 12.5mm diameter, uncoated NIR (Near-InfraRed) precision aspheric lens designed for use in the 780nm wavelength range. The lens is made from S-LAH64 material, a high-refractive index glass developed by Ohara, which provides excellent optical performance.

The lens features a high numerical aperture (NA) of 0.63, indicating a wide angle of acceptance for incoming light. This makes it suitable for applications where high light-gathering capability is required. The effective focal length (EFL) is 10mm, which, combined with the lens's high NA, results in a compact, high-performance optical system.

The lens's aspheric design is a significant feature. Unlike spherical lenses, which can suffer from spherical aberration, aspheric lenses can focus light more accurately over a wider range of wavelengths and angles. This makes them ideal for applications that require high-precision imaging or beam shaping.

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