Hayes, J.Flanagan, J.Monro, T.Richardson, D.Grunewald, P.Allott, R.2007-07-102007-07-102006Optics Express, 2006; 14(22):10345-103501094-40871094-4087http://hdl.handle.net/2440/36215This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-14-22-10345. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.We report the fabrication of a highly multi-mode square core jacketed air-clad fiber with a top-hat near-field intensity profile. Using this fiber to deliver Q-switched pulses at 1 mum we have successfully produced square shaped ablation marks in indium tin oxide (ITO) without the use of complex beam shaping optics.enCopyright © 2006 Optical Society of AmericaJournal article002006314010.1364/OE.14.0103450002423245000242-s2.0-3375073856351118