355397-A 7.2 mm Dia. D-ZLAF52LA Molded Glass Aspheric Lenses; EFL=11 mm; NA=0.3 AR 350-700nm

The 355397-A is a high-quality aspheric lens, sourced from the renowned optical component manufacturer, Thorlabs. This lens is made from D-ZLAF52LA molded glass, a material known for its excellent optical properties and durability. The lens has a diameter of 7.2 mm and a center thickness of 1.947 mm, making it suitable for a wide range of optical applications.

The lens's geometry is another notable feature. It has an effective focal length (EFL) of 11 mm, which is the distance from the lens's center to the point at which light rays converge or diverge. The lens's numerical aperture (NA) is 0.3, indicating its ability to gather and focus light. The NA is calculated by taking the sine of the angle formed by the lens's most oblique ray and the optical axis.

The 355397-A lens also features advanced anti-reflective (AR) coatings on both the front and back surfaces. These coatings, which are designed to transmit light and reduce reflections, cover the wavelength range of 350-700 nm. This makes the lens ideal for use in systems that operate in the visible light spectrum.

In terms of shape, the lens is aspheric, meaning it has a surface profile that deviates from a simple spherical shape. This design helps to reduce spherical aberration, a common optical problem that can degrade image quality. The lens's aspheric profile is defined by its coefficients, which are provided in the item data.