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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:38 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Numerical analysis of laser drilling transverse holes into SM optical fiber thermal processes
Authors:
Dan SAVASTRU, Sorin MICLOS, Roxana SAVASTRU, Ion LANCRANJEAN
Affiliation:
National Institute of R&D for Optoelectronics INOE 2000
E-mail
miclos@inoe.ro
Keywords:
FEM, thermal analysis, laser drilling, fiber optics, transverse holes
Abstract:
The paper presents the results obtained in numerical analysis of thermal processes occurred during laser drilling transverse holes, perpendicular to the optical axis into commercial single mode (SM) optical fiber. Regarding some functional aspects, SM optical fiber with transverse holes penetrated along the entire diameter is similar to optical micro/nano fiber (OMF) sensor used for microfluidics applications, forming a class of optic sensors which become of increasing interest for various applications. The presented results are obtained considering a Gaussian or Super-Gaussian transverse laser intensity transverse distribution of the drilling laser beam. The numerical analysis is accomplished considering the role of drilling laser wavelength as related to the focusing optics characteristics in defining the laser spot diameter and shape as dependent on the drilling laser beam intensity transverse distribution. Two possible drilling laser operation regimes were considered: (1) CW emission with electro-optic or mechanical chopping of the laser beam incident on the SM optical fiber; (2) CW pumping and emission of light pulses, Q-switched, Mode-Locking (ML) or ML with Q-switched modulated pulse amplitude. In the case of drilling laser emission of light pulses, the FWHM duration and repetition frequency of the laser pulses were considered. In performing the numerical analysis, mechanical, thermal, viscosity and optical characteristics of silicate, germanate and tellurite glasses were considered as input data. The shape of the transversally laser drilled hole through commercial SM optical fiber was defined as a function of drilling laser output parameters.
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