N-BK7 (CDGM H-K9L)
Bi-Convex Lenses

Paralight Optics offers N-BK7 (CDGM H-K9L) Bi-Convex lenses with options of either uncoated or our antireflection (AR) coatings, which reduces the amount of light reflected from each surface of the lens. Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of our high-performance multi-layer AR coating improves transmission, which is important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections. Having optics with AR coatings optimized for the spectral range of 350 – 700 nm, 650 – 1050 nm, 1050 – 1700 nm deposited on both surfaces. This coating greatly reduces the high surface reflectivity of the substrate less than 0.5% per surface, yielding a high average transmission across the entire AR coating range for angles of incidence (AOL) between 0° and 30° (0.5 NA), For optics intended to be used at large incident angles, consider using a custom coating optimized at a 45° angle of incidence; this custom coating is effective from 25° to 52°. Broadband coatings have a typical absorption of 0.25%. Check the following Graphs for your references.