LC2679 25.4 mm Dia. N-SF11 Plano-Concave Lens; EFL=-30mm Uncoated

The LC2679 is a Plano-Concave Spherical Lens, part of Thorlabs' extensive catalog of optical elements. This lens boasts a diameter of 25.4 mm and a center thickness of 3.5 mm, making it a robust and compact solution for various optical applications.

The lens's primary feature is its effective focal length (EFL) of -30 mm, which is a measure of the lens's ability to focus light. A negative EFL, as in this case, indicates a diverging lens, which spreads out light rays. This property makes the LC2679 ideal for applications requiring light divergence, such as in laser systems or imaging applications.

The lens is made of N-SF11 Schott glass, a high-index material known for its excellent optical properties. This material is particularly suitable for applications in the near-infrared spectrum, as evidenced by the lens's specified wavelength of 587.6 nm.

Notably, the lens is uncoated, meaning it does not have any anti-reflective or other coatings. While this may result in higher reflective losses, it also means the lens is more cost-effective and suitable for applications where such coatings are not necessary.