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Proceedings Paper

F2-laser-based fabrication of Fabry-Perot cavities in fused silica and sapphire optical fibres
Author(s): V. R. Machavaram; R. A. Badcock; G. F. Fernando
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Paper Abstract

The majority of the reported applications on 157 nm ablation of fused silica and sapphire were concerned with surface micromachining, where the depth of ablation ranges from few hundreds of nanometres to several micrometres. The control of surface morphology and wall-angle of the microstructures was found to be difficult with increasing ablation depth. In this paper, the performance of a Kohler-based illumination in conjunction with a low-numerical aperture imaging system for micromachining cavities through the diameter of standard silica optical fibres and sapphire fibres is presented. Roughness of wall surface and tapering of cavities at different energy densities have been investigated. Nearparallel walled cavities micromachined in silica fibres produced Fabry-Perot fringes as a result of interference of light undergoing Fresnel reflections at the cavity walls. A technique to control the ablation depth of cavities in optical fibres via in-situ monitoring of laser-induced fluorescence is developed.

Paper Details

Date Published: 1 November 2007
PDF: 7 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64235N (1 November 2007); doi: 10.1117/12.780338
Show Author Affiliations
V. R. Machavaram, Univ. of Birmingham (United Kingdom)
R. A. Badcock, Univ. of Birmingham (United Kingdom)
G. F. Fernando, Univ. of Birmingham (United Kingdom)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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