HO-BVL25-40C 25mm Dia. N-BK7 Double-Concave Lens; EFL=-1000mm Single Layer MgF2

The HO-BVL25-40C is a high-quality double-concave lens offered by Holmarc Opto-Mechatronics, a renowned vendor in the optical industry. This lens, with a base shape of a circle, is designed for use in a wide range of optical applications.

The lens has a diameter of 25mm and a center thickness of 2.5mm, making it compact and suitable for various setups. The effective focal length (EFL) of this lens is -1000mm, indicating its concave nature. This negative focal length allows the lens to diverge light, making it ideal for applications such as beam expansion or image reduction.

The lens is made from N-BK7, a popular optical glass type known for its excellent optical properties. This material is especially suitable for applications in the visible spectrum, as demonstrated by the wavelength of 587.6nm provided in the item data.

The lens features a single layer of MgF2 coating on both the front and back surfaces. This coating, often used to enhance the performance of optical components, reduces reflection and increases transmission, thereby improving the overall efficiency of the system.

The item data also provides information about the radii of the lens surfaces (R1 and R2), which are -1043.685969mm and 1043.685969mm respectively. These radii, combined with the lens material and coating, contribute to the lens's high-performance characteristics.