LB1909-B N-BK7 Bi-Convex Lens; Dia:2 in; f=500.0 mm ARC 650-1050nm

The LB1909-B N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs, a leading vendor in the field of precision photonics. This lens, with a diameter of 2 inches, is designed for use in the 650-1050nm wavelength range, making it suitable for a wide range of applications in the fields of optics and photonics.

The lens is constructed from N-BK7, a popular glass type known for its excellent optical properties. This material, also known as BK7, is a borosilicate crown glass with a low refractive index and low dispersion, making it an ideal choice for many optical applications. The lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or outwardly curved. This shape is often used to focus light, making the LB1909-B particularly suitable for use in focusing or collimating systems.

The lens has an effective focal length (EFL) of 500.0mm, which is the distance from the lens to the point where it focuses or collimates light. This long focal length makes the lens suitable for use in systems where a narrow, well-defined beam of light is required. The lens also has a clear aperture of 2 inches, providing a large area for light to pass through.

The LB1909-B is coated with a broadband anti-reflection coating, designed to reduce reflection and increase transmission over a wide range of wavelengths. The coating is applied to both the front and back surfaces of the lens, ensuring high performance in both transmission and reflection.