Design and optimization of high reflectance graded index optical filter with quintic apodization

Vemuri S. R. S. Praveen Kumar; Parinam Sunita; Mukesh Kumar; Parinam Krishna Rao; Neelam Kumari; Vinod Karar; Amit L. Sharma

doi:10.1117/12.2181732

15 June 2015 Design and optimization of high reflectance graded index optical filter with quintic apodization

Vemuri S. R. S. Praveen Kumar, Parinam Sunita, Mukesh Kumar, Parinam Krishna Rao, Neelam Kumari, Vinod Karar, Amit L. Sharma

Author Affiliations +

Proceedings Volume 9654, International Conference on Optics and Photonics 2015; 96540B (2015) https://doi.org/10.1117/12.2181732
Event: International Conference on Optics and Photonics 2015, 2015, Kolkata, India

Abstract

Rugate filters are a special kind of graded-index films that may provide advantages in both, optical performance and mechanical properties of the optical coatings. In this work, design and optimization of a high reflection rugate filter having reflection peak at 540nm has been presented which has been further optimized for side-lobe suppression. A suitable number of apodization and matching layers, generated through Quintic function, were added to the basic sinusoidal refractive index profile to achieve high reflectance of around 80% in the rejection window for normal incidence. Smaller index contrast between successive layers in the present design leads to less residual stress in the thinfilm stack which enhances the adhesion and mechanical strength of the filter. The optimized results show excellent side lobe suppression achieved around the stopband.

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Vemuri S. R. S. Praveen Kumar, Parinam Sunita, Mukesh Kumar, Parinam Krishna Rao, Neelam Kumari, Vinod Karar, and Amit L. Sharma "Design and optimization of high reflectance graded index optical filter with quintic apodization", Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96540B (15 June 2015); https://doi.org/10.1117/12.2181732

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