Journal
OPTICS LETTERS
Volume 43, Issue 5, Pages 995-998Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.000995
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [574017/2008-9]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [08/57857-2, 2013/20180-3]
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We propose a fast and non-destructive method to characterize the absolute diameter and uniformity of micrometer-scale fiber tapers using a pump and probe forward Brillouin scattering setup. The fundamental torsional-radial acoustic mode supported by the wire is excited using a pulsed pump laser and oscillates at a frequency that is inversely proportional to the taper waist diameter. This standing time-varying torsional-radial wave induces polarization modulation on a probe signal, whose spectrum structure reveals the sample diameter and its non-uniformity. By comparing our results with measurements using scanning-electron microscopy, a relative deviation of 1% or less was demonstrated, and diameter non-uniformity of less than 0.5% could be detected. (C) 2018 Optical Society of America
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