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- Title
Design and optimization of thin film polarizer at the wavelength of 1540 nm using differential evolution algorithm.
- Authors
Ebrahimi, Mahdi; Ghasemi, Mohsen
- Abstract
In this paper, a thin film polarizer at the wavelength of 1540 nm in infrared region was designed and optimized using differential evolution method. It is shown how the algorithm’s parameters can change the output result to obtain the best consequence of optimization. This polarizer consists of a few pairs of high and low refractive index dielectric materials, titanium dioxide and silicon dioxide, respectively, with BK7<inline-graphic></inline-graphic> glass substrate and the angle of incident light was supposed 56° that is the Brewster angle for BK7<inline-graphic></inline-graphic> glass. Our final optimized polarizer has 91.20 and 0.336% transmittance for P and S polarization, respectively, and a 271 ratio of TPTS<inline-graphic></inline-graphic> which has high significance for this polarizer. It consists of eight pairs of layers with low and high refractive index materials and 3369.1 nm physical thickness which is used to separate S and P polarized light for Q-switching process.
- Subjects
THIN films; TITANIUM dioxide; BREWSTER'S angle; REFRACTIVE index; Q-switching
- Publication
Optical & Quantum Electronics, 2018, Vol 50, Issue 4, p1
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-018-1453-9