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- Understanding fiber Bragg gratings at harmonics of the Bragg wavelength through spectra and images
- Collins, Stephen F.; Wade, Scott A.; Sidiroglou, Fotios; Baxter, Greg W.
- Fiber Bragg gratings written using a phase-mask exhibit a complex refractive index pattern in the fiber core, as observed in differential interference contrast (DIC) microscopy. This results in dual periodicities along the fiber core and gratings at both the Bragg wavelength, twice the Bragg wavelength, and the harmonics of these. Features in grating spectra arise from one or both of these periodicities and spectra for twice the Bragg wavelength (or its odd harmonics) are very sensitive to the details of how the UV complex diffraction field of the phase mask becomes imprinted as refractive index changes in the fiber core.
- Publication type
- Conference paper
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences
- Proceedings of SPIE: proceedings of the 22nd International Conference on Optical Fiber Sensors (OFS2012), Beijing, China, 15-19 October 2012, Vol. 8421, article no. 84211Z
- Publication year
- Bragg grating harmonics; Bragg wavelength; Fiber Bragg gratings; Harmonics; Imaging of gratings; Phase mask
- Publisher URL
- Copyright © 2012 SPIE. Society of Photo-Optical Instrumentation Engineers. This paper was originally published in Proceedings of SPIE (Vol. 8421), and is available from: http://dx.doi.org/10.1117/12.974804. The published version is reproduced in accordance with the copyright policy of the publisher. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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