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00925njm 22002777a 4500 dc Martínez Matos, Óscar author Vaveliuk, Pablo author González Izquierdo, Jesús author Loriot, Vincent author 2013-10-21 Spatial shaping of ultrashort laser beams at the focal plane is theoretically analyzed. The description of the pulse is performed by its expansion in terms of Laguerre-Gaussian orthonormal modes. This procedure gives both a comprehensive interpretation of the propagation dynamics and the required signal to encode onto a spatial light modulator for spatial shaping, without using iterative algorithms. As an example, pulses with top-hat and annular spatial profiles are designed and their dynamics analyzed. The interference of top-hat pulses is also investigated finding potential applications in high precision pump-probe experiments (without using delay lines) and for the creation of subwavelength ablation patterns. In addition, a novel class of ultrashort pulses possessing non-stationary orbital angular momentum is also proposed. These exotic pulses provide additional degrees of freedom that open up new perspectives in fields such as laser-matter interaction and micro-machining. 1094-4087 10.1364/OE.21.025010 https://hdl.handle.net/20.500.14352/33515 http://dx.doi.org/10.1364/OE.21.025010 http://www.opticsinfobase.org/ Femtosecond spatial pulse shaping at the focal plane