LE1613-C 50.8 mm Dia. N-BK7 Positive Meniscus Lens; EFL=250mm 1050-1700nm

The LE1613-C is a 50.8 mm diameter Spherical Lens with a Positive Meniscus shape, sourced from the renowned optical component manufacturer, Thorlabs. This lens is designed for use in the 1050-1700nm wavelength range, making it suitable for a variety of applications in the near-infrared spectrum.

The lens features an effective focal length (EFL) of 250mm, which is a critical parameter in determining the lens's magnification power. The EFL, combined with the lens's geometry, enables the lens to focus light to a tight spot, making it ideal for use in imaging systems, beam shaping, and other applications where precise light control is required.

The LE1613-C is made from N-BK7, a high-quality borosilicate glass known for its excellent optical properties. This material ensures high transmission in the specified wavelength range and low optical dispersion, which is crucial for maintaining image quality and reducing chromatic aberration.

The lens's geometry is characterized by a convex-concave shape, with radii of curvature of 82.5mm and 224.7mm for the front and back surfaces, respectively. This shape, combined with the lens's thickness (2.9mm at the edge and 5.5mm at the center), contributes to its positive meniscus design.

The lens is coated with Thorlabs' anti-reflection coating (AR coating), specifically the THo C Bbar coating, on both the front and back surfaces. This coating reduces surface reflections, thereby increasing the lens's transmission and improving overall system performance.