HO-BVL50-06B 50mm Dia. N-BK7 Double-Concave Lens; EFL=-300mm BBAR 400-700nm

This is a HO-BVL50-06B 50mm diameter N-BK7 double-concave lens, featuring an effective focal length (EFL) of -300mm and broadband anti-reflection (BBAR) coating optimized for the 400-700nm wavelength range. The lens is sourced from Holmarc Opto-Mechatronics, a reputable vendor known for its high-quality optical components.

The lens is designed with a spherical shape, featuring two concave surfaces. The first surface has a radius of curvature (R1) of -313.738212mm, while the second surface has an R2 of +313.738212mm. This specific curvature combination results in the lens's overall double-concave geometry, which is particularly useful in various optical systems requiring negative focal lengths.

The lens's diameter measures 50mm, and its central thickness is 2.5mm. The lens's inner and outer radii are both zero, indicating that the lens's edge thickness is uniform and equal to its central thickness.

The lens is made of N-BK7 glass, a popular material in the optical industry due to its excellent optical properties and wide transparency range. N-BK7, also known as BK7, is a borosilicate crown glass with a low refractive index and low dispersion, making it suitable for various applications, including imaging, beam shaping, and laser systems.

The lens features BBAR coating on both the front and back surfaces, designed to minimize reflection and increase transmission within the specified 400-700nm wavelength range. This coating enhances the lens's performance in various applications, such as broadband illumination, fluorescence microscopy, and multispectral imaging.