Sat, 05 Jul 2008 13:05:38 BST CiteULike: dhbradshaw's spatial-mode-selection http://www.citeulike.org/user/dhbradshaw/tag/spatial-mode-selection CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dhbradshaw/article/1398766 <i>Optics Letters, Vol. 29, No. 16. (15 August 2004), pp. 1942-1944.</i> Vortices in femtosecond lasers K Bezuhanov A Dreischuh GG Paulus MG Schatzel H Walther Optics Letters, Vol. 29, No. 16. (15 August 2004), pp. 1942-1944. 2007-06-19T15:08:18-00:00 2004 Optics Letters 29 16 1942 1944 spatial spatial-light-modulators spatial-mode-selection http://www.citeulike.org/user/dhbradshaw/article/1323035 <i>Optics Express, Vol. 13, No. 19. (September 2005), pp. 7599-7608.</i><br /><br />We experimentally created a femtosecond optical vortex using a pair of computer-synthesized holographic gratings arranged in a 2f - 2f optical setup. We present measurements showing that the resulting donut mode is free of spatial chirp, and support this finding with an analysis of the optical wave propagation through our system based on the Kirchhoff-Fresnel diffraction integral. An interferogram confirms that our ultrashort vortex has topological charge 1, and a conservative experimental estimation of its duration is 280 fs. We used 25-fs radiation pulses (bandwidth approximately 40 nm) produced by a Ti:sapphire laser oscillator. Creation of optical vortices in femtosecond pulses Mariyenko J Strohaber C Uiterwaal Optics Express, Vol. 13, No. 19. (September 2005), pp. 7599-7608. 2007-05-23T22:23:35-00:00 2005 Optics Express 13 19 7599 7608 spatial-light-modulators spatial-mode-selection