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Proceedings Paper

Design and optimization of high reflectance graded index optical filter with quintic apodization
Author(s): Vemuri S. R. S. Praveen Kumar; Parinam Sunita; Mukesh Kumar; Parinam Krishna Rao; Neelam Kumari; Vinod Karar; Amit L. Sharma
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Paper 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.

Paper Details

Date Published: 15 June 2015
PDF: 6 pages
Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96540B (15 June 2015); doi: 10.1117/12.2181732
Show Author Affiliations
Vemuri S. R. S. Praveen Kumar, Central Scientific Instruments Organisation (India)
Academy of Scientific & Innovative Research (India)
Parinam Sunita, Central Scientific Instruments Organisation (India)
Academy of Scientific & Innovative Research (India)
Mukesh Kumar, Central Scientific Instruments Organisation (India)
Academy of Scientific & Innovative Research (India)
Parinam Krishna Rao, Central Scientific Instruments Organisation (India)
Neelam Kumari, Central Scientific Instruments Organisation (India)
Academy of Scientific & Innovative Research (India)
Vinod Karar, Central Scientific Instruments Organisation (India)
Academy of Scientific & Innovative Research (India)
Amit L. Sharma, Central Scientific Instruments Organisation (India)
Academy of Scientific & Innovative Research (India)


Published in SPIE Proceedings Vol. 9654:
International Conference on Optics and Photonics 2015
Kallol Bhattacharya, Editor(s)

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