LD2297-C N-SF11 Bi-Concave Lens; Dia:25.4 mm; f=-25.0 mm ARC 1050-1700nm

The LD2297-C is a high-quality bi-concave lens offered by Thorlabs, a leading global manufacturer of photonics components. This lens is designed for use in the 1050-1700nm wavelength range, making it suitable for a wide array of applications in the infrared spectrum.

The lens features a spherical geometry with a diameter of 25.4mm and a base shape of a circle. The lens is 7.2mm thick at the edge and 3mm thick at the center, providing a robust structure while maintaining a compact profile. The effective focal length (EFL) of the lens is -25mm, and the back focal length (BFL) is -25.6mm, indicating a strong converging power.

The LD2297-C is made from N-SF11 Schott glass, a material known for its excellent optical properties and durability. This lens is coated with Thorlabs' proprietary anti-reflection coating, which enhances its performance by reducing surface reflections and increasing transmission in the specified wavelength range.

The coating on both the front and back surfaces of the lens is THo C Bbar, a durable coating that provides high transmission and excellent environmental stability. This coating is designed to withstand harsh conditions, ensuring the lens maintains its performance over time.