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Your search keyword '"Sircilli, Francisco"' showing total 14 results
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14 results on '"Sircilli, Francisco"'

1. Experimental Characterization of Permanent Magnets Used in Periodic Structures

Author

Sircilli, Francisco, Serrao, Valdir A., Passaro, Angelo, Stopa, Carlos R. S., and Cardoso, Jose R.

Subjects
Magnets, Permanent -- Measurement, Free electron lasers -- Measurement, Wave-motion, Theory of -- Methods, Business, Electronics, Electronics and electrical industries
Abstract

In a periodic structure, the magnetic flux density profile of a hybrid undulator depends strongly on the characteristics of its permanent magnets. A simple procedure to select the best permanent magnets for periodic magnetic structures is presented here. We used a very simple apparatus for the magnetic field measurements. We tested by assembling periodic structure prototypes formed by brick-shaped permanent magnets. Index Terms--Free electron lasers, periodic structures, permanent magnets, undulators.

Published
2001

3. Analysis Of Highly Birefringent Photonic Crystal Fibers With Squeezed Rectangular Lattices

Author

Franco, Marco, Barreto, Elaine, Serrao, Valdir, Sircilli, Francisco, Hattori, Haroldo, Franco, Marco, Barreto, Elaine, Serrao, Valdir, Sircilli, Francisco, and Hattori, Haroldo

Abstract

In this article, we analyze the birefringence of photonic crystal fibers with squeezed rectangular lattices by using finite element method. When the original photonic crystal fiber is squeezed, the lattice is compressed, and the holes become elliptical. This operation leads to birefringences as high as 7.5 × 10-3 at 1550 nm. However, confinement losses and dispersion are also changed after this operation is performed, needing to be reassessed. We estimate the changes in dispersion and confinement losses after this operation is performed.

Published
2008

11. Opto-Mechanical Response of a Suspended-Slab-Core Optical Fiber.

Author

Serrão, Valdir A., Sircilli, Francisco, Franco, Marcos A. R., and Cordeiro, Cristiano M. B.

Subjects
*OPTICAL fibers, *NUMERICAL analysis, *MICROSTRUCTURE, *HYDROSTATIC pressure, *FINITE element method
Abstract

In this paper we report the numerical evaluation of the opto-mechanical response of a microstructured optical fiber design when submitted to hydrostatic pressure. The fiber was built in silica and is composed of two large holes surrounding a wide thin flat region (suspended-slab-core) that is able to support optical propagating modes. A full-vector finite element program was used to the stress-optical analysis. The opto-mechanical sensitivity of such fiber was evaluated under two schemes of applied hydrostatic pressure. [ABSTRACT FROM AUTHOR]

Published
2008
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12. Numerical and Experimental Studies for a High Pressure Photonic Crystal Fiber Based Sensor.

Author

Hayashi, Juliano G., Cordeiro, Cristiano M. B., Franco, Marcos A. R., and Sircilli, Francisco

Subjects
OPTICAL fiber detectors, CRYSTAL whiskers, PHOTONICS, HIGH pressure (Science), MICROSTRUCTURE
Abstract

We report a study of using photonic crystal fibers (PCFs) for high pressure applications. An opto-mechanical analysis was realized in regular PCFs and suspended-core microstructured optical fibers for different fiber geometrical parameters. It was found that the pressure sensitivity is highly dependent on the fiber structure. It was also experimentally shown that even small core PCFs with high air filling fraction can deal with pressures as high as 500 bar (7350 psi) without any noticeable problem. [ABSTRACT FROM AUTHOR]

Published
2008
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