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Proceedings Paper

Micro-lens machining on optical fibers by direct laser ablation
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Paper Abstract

Beam shaping at the output of optical fibers is required in a variety of applications including optical sensors, telecommunication devices and medical applications. We present a laser micro-machining technique for the fabrication of micro-lenses directly upon the end face of silica fibers using a F2-laser processing station. Ablation is performed in a mask projection arrangement with 25x demagnification. A mask with an occluded circular beam shape is imaged perpendicular to the fiber axis. The fiber is rotated axially while the laser cuts through the fiber, yielding a spherically shaped tip with radius defined by the mask dimensions. Strong 157 nm absorption by the silica glass facilitates precise structuring without micro-crack formation. The quality of the fiber-lenses is characterized by AFM, SEM and by analysing the beam profile at the fiber output.

Paper Details

Date Published: 9 December 2004
PDF: 7 pages
Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); doi: 10.1117/12.567671
Show Author Affiliations
Thomas Fricke-Begemann, Laser-Lab. Gottingen e.V. (Germany)
Jianzhao Li, Univ. of Toronto (Canada)
Jurgen Ihlemann, Laser-Lab. Gottingen e.V. (Germany)
Peter Robert Herman, Univ. of Toronto (Canada)
Gerd Marowsky, Laser-Lab. Gottingen e.V. (Germany)


Published in SPIE Proceedings Vol. 5578:
Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education
Marc Nantel; Glen Herriot; Graham H. McKinnon; Leonard MacEachern; Robert A. Weersink; Rejean Munger; Andrew Ridsdale, Editor(s)

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