LB1779-B N-BK7 Bi-Convex Lens; Dia:1 in; f=300.0 mm ARC 650-1050nm

The LB1779-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 1 inch, is designed for use in the spectral range of 650-1050nm, making it suitable for a wide range of applications in the near-infrared region.

The lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or outwardly curved. This design is often used to achieve specific optical properties, such as a particular focal length or dispersion characteristic. In this case, the effective focal length (EFL) of the lens is 300mm, providing a long focal length that can be beneficial in applications requiring high magnification or narrow fields of view.

The lens is made from N-BK7, a type of borosilicate glass that is widely used in optical systems due to its excellent optical properties and chemical resistance. The N-BK7 designation refers to the specific composition of the glass, which is standardized by Schott, a renowned manufacturer of specialty glass and glass-ceramics.

The lens features anti-reflection coatings on both the front and back surfaces. These coatings, identified as "tho b bbar," are designed to reduce reflection and increase transmission of light across the specified spectral range. The thickness of the lens at the edge is 2mm, while the center thickness is 2.5mm, providing a robust and durable structure.