AL1815-C 18 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=15 mm; NA=0.53 AR 1050-1700nm

The AL1815-C is a high-precision aspheric lens, 18 mm in diameter, manufactured by Thorlabs. This lens is made from S-LAH64, a high-quality optical glass from Ohara, known for its excellent transmittance and low autofluorescence. The lens features a high numerical aperture (NA) of 0.53, indicating a wide acceptance angle and high light-gathering capability.

The lens has an effective focal length (EFL) of 15 mm, making it suitable for applications that require a short focal length. The aspheric design of the lens helps to reduce spherical aberration, a common issue in traditional spherical lenses, resulting in improved image quality and resolution.

The lens is CNC polished, ensuring high surface accuracy and excellent optical performance. It has a center thickness of 6.2 mm and an edge thickness of 2.5 mm, providing structural rigidity and resistance to deformation.

The lens is coated with Thorlabs' proprietary broadband anti-reflection coating, which covers the wavelength range of 1050-1700nm. This coating reduces surface reflections, enhancing the transmission of light through the lens and minimizing losses due to reflection.