This is a Plano-Concave Spherical Lens with a diameter of 25mm, manufactured by Holmarc Opto-Mechatronics. The lens has a center thickness of 2.5mm and an effective focal length (EFL) of -200mm, making it suitable for applications that require a negative focal length. The lens's concave surface has a radius of curvature (R1) of -104.323mm.
The lens is made of N-BK7 Schott glass, a popular material for optical elements due to its excellent optical properties and wide transparency range. The glass has an Abbe number of 64.17 and a refractive index of 1.5168 at 587.6nm, which is the wavelength used for the specification of the lens's properties.
The lens features broadband anti-reflection (BBAR) coating on both surfaces, designed for the 400-700nm wavelength range. This coating reduces reflection and increases transmission, enhancing the lens's performance in various applications. The BBAR coating is applied using the Holmarc's proprietary Hol-BBBAR 0 AOI process, ensuring high-quality and durable coating.