Topic
Step-index profile
About: Step-index profile is a research topic. Over the lifetime, 3104 publications have been published within this topic receiving 53199 citations.
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TL;DR: In this article, the beam quality factor (or M2-parameter) for linearly polarized (LP)-modes of a step-index fiber is calculated in a closed form, as a function of the fiber V-number.
Abstract: The beam quality factor (or M2-parameter) for linearly polarized (LP)-modes of a step-index fiber is calculated in a closed form, as a function of the fiber V-number. It is shown that M2 sharply peaks for all fiber modes when they are close to cutoff. Particularly simple expressions are derived in the limit Vrarrinfin. Two practically important coherent superpositions of modes are considered for which the degree of degradation of the beam quality due to the higher order mode content is calculated. The reported results can be useful for designing large-core high-power fiber lasers, amplifiers, and fiber-based beam delivery systems, when preservation of the spatial beam quality is important
38 citations
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TL;DR: In this paper, the fabrication of Bragg reflectors in hydrogenated, all-silica, fluorine cladding depressed and micro-structured optical fibers using 248 nm, 5 ps laser radiation was investigated.
Abstract: The fabrication of Bragg reflectors in hydrogenated, all-silica, fluorine cladding depressed and microstructured optical fibers using 248 nm, 5 ps laser radiation, is investigated here. Comparative Bragg grating recordings are performed in both optical fibers, for investigating effects related to the scattering induced by the capillary micro-structure, to the photosensitivity and index engineering yield. Further, finite difference time domain method is employed for simulating the scattering from the above capillary structure and the nominal intensity reaching the fiber core for side-illumination. The maximum modulated refractive index changes inscribed in the standard, step-index fiber were of the order of 8.3x10-5, while the maximum refractive index changes inscribed in one of the microstructured optical fibers was 32% lower and 5.7x10-5, for nominal pulse intensities of 20 GW/cm2 and modest accumulated energy densities.
38 citations
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TL;DR: In this paper, the authors show that the low propagation losses and the diffusion profile are related to the interaction between the two alkalis and propose a waveguide that approximates a step-index profile in soda-lime glass.
Abstract: Optical waveguides approximating a step-index profile have been fabricated in soda-lime glass by ion-exchanging rubidium or caesium for sodium. We show that the low propagation losses and the diffusion profile are related to the interaction between the two alkalis.
38 citations
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TL;DR: In this article, an analogy between the mode equation and Schrodinger's equation has been used to show that the important parameter to study in waveguiding systems is the square of the effective index of a mode rather than the active index itself.
Abstract: An analogy between the mode equation and Schrodinger's equation has been used to show that the important parameter to study in waveguiding systems is the square of the effective index of a mode rather than the effective index itself. This method was used to interpret simply and analytically some results published earlier. The agreement with the interpretation published originally is shown to be very good. No computing is involved. A quasi-linear index profile has been observed.
38 citations
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TL;DR: In this article, a fiber taper facility that allows the fabrication of fiber tapers between a few centimeters and tens of meters in length and that can be used for standard and microstructured optical fibers (MOFs) was reported.
Abstract: We report a novel fiber taper facility that allows the fabrication of fiber tapers between a few centimeters and tens of meters in length and that can be used for standard and microstructured optical fibers (MOFs). Efficient reduction of error in diameter variation is achieved using the velocity control feedback loop. The experimental results of the tapering of both the step index fiber and the MOF are presented. The observed outer diameter tracking error over the taper length was within 1%.
38 citations