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New journal paper publication: NUV femtosecond laser inscription of volume Bragg gratings in poly (methyl) methacrylate with linear and circular polarisations.

L.Ye, W. Perrie, O. Allegre, Y. Jin, Z. Kuang, P. Scully, E. Fearon, D.Eckford, S. Edwardson  and G.Dearden (2013).

NUV femtosecond laser inscription of volume Bragg gratings in poly (methyl) methacrylate with linear and circular polarisations.

Laser Phys. 23 (2013) 126004.

doi:10.1088/1054-660X/23/12/126004

Published December 2013

Paper

Large, high efficiency, volume Bragg gratings with dimensions of 5 mm × 5 mm and thickness between 1 and 7 mm with 20 μm pitch have been inscribed in poly(methyl)methacrylate (PMMA) with 180 fs, 387 nm parallel beams using both linear and circular polarizations. Linear polarization (perpendicular to the scan direction) produced the highest refractive index contrast, while circular polarization produced the lowest. The measured first-order diffraction efficiency with grating thickness L agrees well with theoretical expectations, and reached a maximum of 94% near L = 4 mm, the highest yet observed in pure PMMA. The source of the variation in refractive index contrast was investigated, and it was found to be due to the polarization-dependent nonlinear filamentation, the first such observation in a pure polymer.

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About Patricia Scully

Senior Lecturer in Sensor Instrumentation in The Photon Science Institute and the School of Chemical Engineering and Analytical Science. Senior academic with experience of leading industrial and research council/government funded research projects at national and international level. Research interests: Optical sensing and measurement Photonic devices Optical fibre sensors Femtosecond lasers for photonic structuring Polymer optoelectronics Assistive technology for healthcare applications Polymer optical fibre Optical fibre technology Distributed sensing Functional optical coatings Energy harvesting and wireless monitoring

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