2026-06-08T02:37:50Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/335152023-08-26T17:17:33Zcom_20.500.14352_14col_20.500.14352_15

Martínez Matos, Óscar Vaveliuk, Pablo González Izquierdo, Jesús Loriot, Vincent 2023-06-19T13:23:43Z 2023-06-19T13:23:43Z 2013-10-21 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/ 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. eng open access Femtosecond spatial pulse shaping at the focal plane journal article