title: Rugate filters used in slit-lamp delivery to improve color rendering of illumination for retinal photocoagulation.
abstract: Laser filters and color filters used in slit-lamp delivery have been developed by the rugate approach to improve color rendering of illumination for retinal photocoagulation. The double-notch laser filter is designed according to the required laser lines and incident angle. Based on the transmission spectrum of a double-notch laser filter and the spectral power distribution (SPD) of the light source of a slit lamp, a scanning search algorithm is applied to find the optimal transmission spectrum of a multi-notch color filter for the best color rendering index of illumination. Open-source software is used to design the refractive index profile of the rugate filters, which are deposited by the reactive pulse magnetron sputtering. Both the theoretical analysis of SPD of slitlamp delivery with consideration of the deposited rugate filters and the experimental results demonstrate that the color rendering property of illumination can be improved remarkably, thus making fundus observation and retinal laser photocoagulation more reliable and efficient.
authors.forename: Yi Yu
authors.initials: YY
authors.lastname: Li
authors.forename: Jiao Jie
authors.initials: JJ
authors.lastname: Chen
authors.forename: Hai Hua
authors.initials: HH
authors.lastname: Feng
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Qin Mei
authors.initials: QM
authors.lastname: Wang
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008028:Light Coagulation / Q000295:instrumentation*; D008029:Lighting / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012164:Retinal Diseases / Q000473:pathology* / Q000601:surgery*; D066167:Slit Lamp; D025321:Surgery, Computer-Assisted / Q000295:instrumentation* / Q000379:methods