BICC-25.4/100.0C 25.4 mm Dia. x -97 mm FL; Uncoated; Double-Concave Lens

This is a double-concave lens, also known as a biconcave lens, sourced from the renowned optical components vendor, Laser Components. The lens is characterized by its concave-concave base shape and circular geometry, with a diameter of 25.4 mm. The lens's edge thickness is 4.5 mm, while the center thickness is 2 mm, providing a robust structure for various applications.

The lens has an effective focal length (EFL) of -97 mm, making it suitable for applications that require a negative focal length. The first and second radii of curvature (R1 and R2) are -100 mm and 100 mm, respectively, contributing to the lens's double-concave structure.

The lens is made of n-BK7 Schott, a high-quality optical glass known for its excellent transmission properties and low auto-fluorescence. This material makes the lens suitable for a wide range of applications, particularly where high optical quality is required.

The lens is designed to work with a wavelength of 633 nm, making it suitable for applications that use red lasers. However, it's essential to note that the lens does not come with any coating, which may affect its performance in certain applications.