The LC1254-C is a plano-concave lens from Thorlabs, featuring a spherical design and a base shape of a circle. This lens is made from the renowned N-BK7 glass, a type of borosilicate crown glass known for its excellent optical properties, including a high Abbe number and low dispersion. The lens has a diameter of 25 mm and a thickness at the edge of 5.5 mm, while the center thickness is 4 mm.
The lens's effective focal length (EFL) is -100 mm, indicating its diverging nature. The radius of curvature (R1) is -51.5 mm, and the back focal length (BFL) is -102.6 mm. The lens is designed to operate at a wavelength of 632.8 nm.
The LC1254-C comes with anti-reflection (AR) coatings on both the front and back surfaces, specifically designed for the wavelength range of 1050-1700 nm. This coating helps to reduce surface reflections, thereby increasing the amount of light transmitted through the lens.