49-109 15 mm Dia. L-BAL35 Precision Aspheric Lens; EFL=11.25mm; NA=0.66 BBAR 600-1050nm

This is the 49-109 model from Edmund Optics, a high-precision aspheric lens with a 15 mm diameter. The lens is made from L-BAL35, a material specifically designed for use in the near-infrared spectrum. The lens has a numerical aperture (NA) of 0.66, which is a measure of its ability to gather light and resolve fine details. The effective focal length (EFL) of this lens is 11.25mm, making it suitable for use in a variety of optical systems.

The lens features broadband anti-reflection (BBAR) coating, which is designed to reduce surface reflections and increase transmission in the 600-1050nm wavelength range. This coating helps to improve the overall efficiency and performance of the lens. The lens has a center thickness of 7mm and an edge thickness of 1.94mm, providing excellent structural integrity and durability.

The aspheric design of this lens helps to reduce spherical aberration, a common optical distortion that can degrade image quality. The lens has a front radius of curvature (R1) of 6.628mm and a back radius (R2) of 0mm, which contributes to its excellent optical performance. The lens also has a front surface (k1) of -1.076527, which further enhances its ability to focus light accurately.