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Reducing sidelobes in a Rugate filter to achieve high reflectivity



  1. Physics Science Department, College of Science, Mustansiriyah University, Baghdad, Iraq


In this paper, an optical interference Rugate filter was designed with high refractive index (2.4 with thickness= 57.292 nm), low refractive index (1.5 with thickness= 91.667 nm) and the reflectance spectra= 550 nm. Several optimized steps were performed to reduce the secondary sidelobes. The results show excellent flatness in the reflectance band. Apodization, quintic matching layers, and top AR coating are two effective means to eliminate the sidelobes near the stopband region. This paper goes into greater detail on analyzing data and explains what different statistical information can be calculated when designing optical filters, including mean, median, mode, and standard deviation..


Apodization, AR coating, Rugate filter, Refractive index, Reflectivity, Statistics analyzing data.

Submitted at: May 12, 2023
Accepted at: Oct. 6, 2023


ELHAM JASIM MOHAMMAD, Reducing sidelobes in a Rugate filter to achieve high reflectivity, Journal of Optoelectronics and Advanced Materials Vol. 25, Iss. 9-10, pp. 418-423 (2023)