RT Journal Article T1 Few-cycle pulse retrieval using amplitude swing technique A1 López-Ripa, Miguel A1 Pérez Benito, Óscar A1 Alonso, Benjamín A1 Weigand Talavera, Rosa María A1 Sola, Íñigo AB Ultrashort pulses have garnered significant attention across various scientific disciplines and applications. In this paper, we demonstrate that the recently introduced amplitude swing technique is a robust method for characterizing pulses in the few-cycle temporal domain by analyzing compressed and chirped pulses from a Ti:Sapphire laser oscillator. The duration of the measured pulse for the case of best compression was 5.98 fs (Fourier limit 5.50 fs) corresponding to 2.2 cycles, while the chirped pulses were up to 15 times temporally stretched. The results obtained have been validated using the d-scan technique, showing excellent agreement in all situations. Therefore, the capability of the amplitude swing technique to measure ultra-broadband pulses in the few-cycle regime is demonstrated, as well as very far from optimum compression, while only being limited by the transparency and birefringence of its elements. PB Optica Publishing Group YR 2024 FD 2024-06-03 LK https://hdl.handle.net/20.500.14352/113843 UL https://hdl.handle.net/20.500.14352/113843 LA eng NO Miguel López-Ripa, Óscar Pérez-Benito, Benjamín Alonso, Rosa Weigand, and Íñigo Sola, "Few-cycle pulse retrieval using amplitude swing technique," Opt. Express 32, 21149-21159 (2024) NO "CT63/19-CT64/19" (UNIVERSIDAD COMPLUTENSE DE MADRID. Contratos predoctorales de personal investigador en formación. Convocatoria 2019)"EQC2018-004117-P" (Ministerio de Economía y Competitividad" NO Universidad Complutense de Madrid NO Ministerio de Economía y Competitividad (España) NO Ministerio de Ciencia e Innovación (España) NO European Commission NO Junta de Castilla y León DS Docta Complutense RD 9 abr 2025