LB1199-B N-BK7 Bi-Convex Lens; Dia:2 in; f=200.0 mm ARC 650-1050nm

The LB1199-B N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs, a leading vendor in the field of optical equipment. This lens, with a diameter of 2 inches, is designed for use in the wavelength range of 650-1050nm, making it suitable for a wide range of applications in the near-infrared spectrum.

The lens is constructed from N-BK7, a type of borosilicate glass known for its excellent optical properties. This material is characterized by a low coefficient of thermal expansion, making it resistant to thermal shock. The lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or outwardly curved. This design provides a focal length of 200mm, as indicated by the 'f=200.0 mm' parameter in the item data.

The lens has a thickness of 3mm at the edge and 6.2mm at the center, providing structural rigidity while minimizing unwanted optical effects. The inner and outer radii are 0, indicating a symmetrical curvature. The effective focal length (EFL) is 198mm, slightly shorter than the nominal focal length due to the curvature of the lens.

The lens is coated with a broadband anti-reflection coating (ARC), specifically designed for the wavelength range of 650-1050nm. This coating reduces reflective losses at the lens surfaces, enhancing transmission and improving overall system performance. The coating is applied to both the front and back surfaces of the lens, as indicated by 'tho b bbar' in the item data.