LD1170 N-BK7 Bi-Concave Lens; Dia:25.4 mm; f=-75.0 mm Uncoated

The LD1170 is a high-quality bi-concave lens offered by Thorlabs, a leading global manufacturer of photonics components. This lens, crafted from the renowned N-BK7 glass by Schott, is designed for use in a wide range of optical systems.

The lens features a diameter of 25.4 mm and a base shape of a circle. It has a center thickness of 3.5 mm and an edge thickness of 5.6 mm, providing a robust and durable structure. The lens's effective focal length (EFL) is -75 mm, indicating its concave-concave nature, which is ideal for diverging light paths.

The LD1170's radii of curvature are -77.9 mm for the first surface and 77.9 mm for the second, contributing to its unique optical properties. The back focal length (BFL) is -75.9 mm, and the lens has no inner or outer radius, indicating a uniform curvature across its surface.

This lens is designed for use with a wavelength of 587.6 nm, making it suitable for a wide range of applications in the visible light spectrum. The lens is uncoated, offering users the flexibility to apply their preferred coatings based on their specific application requirements.