4 May 2007 High index contrast hole-free photonic crystal fiber
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A couple of multicomponent glasses was used to produce solid hole-free photonic crystal fiber (PCF) with high contrast of index. These glasses were a high index barium-lanthanum flint-glass (n~1.8) and a low index cron-glass (n~1.5). The compositions of selected glasses provided the coincidence of their viscosities in the temperature range of drawing, close thermal expansion coefficients, and chemical compatibility. To produce the PCF densely packed bundles of glass rods (elements) of 1 mm diameter assembled in a given structures were multiply co-drawn down to 0.2-2.0 microns diameter of a single element. This procedure allowed scaling of initial structures and resulted in two PCF structures: axially symmetrical eight-period structure and five-period "birefringent" structure. Optical transmission of the resultant PCF demonstrates the existence of photonic band-gaps, and intensity distribution of propagating mode corresponds to the results of numerical simulation performed.
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Andrey Lipovskii, Anatoly Anan’ev, Leonid Maksimov, Vladimir Polukhin, Dmitry Tagantsev, Boris Tatarintsev, "High index contrast hole-free photonic crystal fiber", Proc. SPIE 6588, Photonic Crystal Fibers, 658806 (4 May 2007); doi: 10.1117/12.722390; https://doi.org/10.1117/12.722390

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