Francisco Silva
University of Porto
57Publications
15H-index
738Citations
Publications 57
Newest
Published on Apr 1, 2019in Biomedical Optics Express 3.48
Christian Maibohm , Francisco Silva15
Estimated H-index: 15
+ 5 AuthorsJana B. Nieder9
Estimated H-index: 9
We demonstrate for the first time that an ultra-broadband 7 femtosecond (fs) few-cycle laser can be used for multicolor nonlinear imaging in a single channel detection geometry, when employing a time-resolved fluorescence detection scheme. On a multi-chromophore-labelled cell sample we show that the few-cycle laser can efficiently excite the multiple chromophores over a >400 nm two-photon absorption range. By combining the few-cycle laser excitation with time-correlated single-photon counting (T...
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Published on Jan 15, 2019in Optics Letters 3.59
Miguel Miranda8
Estimated H-index: 8
(Lund University),
Francisco Silva15
Estimated H-index: 15
+ 10 AuthorsPaulo T. Guerreiro4
Estimated H-index: 4
We demonstrate the complete temporal characterization of the optical waveform of visible near-infrared octave-spanning ultrashort laser pulses, using an all-optical, all-solid-state, and fully inline dispersion-scan device based only on second-harmonic generation.
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Published on Dec 1, 2018in Scientific Reports 4.12
E. Conejero Jarque3
Estimated H-index: 3
(University of Salamanca),
J. San Román9
Estimated H-index: 9
(University of Salamanca)
+ 6 AuthorsHelder Crespo12
Estimated H-index: 12
(University of Porto)
Gas-filled hollow-core fiber (HCF) pulse post-compressors generating few- to single-cycle pulses are a key enabling tool for attosecond science and ultrafast spectroscopy. Achieving optimum performance in this regime can be extremely challenging due to the ultra-broad bandwidth of the pulses and the need of an adequate temporal diagnostic. These difficulties have hindered the full exploitation of HCF post-compressors, namely the generation of stable and high-quality near-Fourier-transform-limite...
2 Citations Source Cite
Published on Jan 15, 2018in Optics Letters 3.59
Francisco Silva15
Estimated H-index: 15
(University of Porto),
Benjamín Alonso10
Estimated H-index: 10
(University of Salamanca)
+ 7 AuthorsÍñigo J. Sola12
Estimated H-index: 12
(University of Salamanca)
Intense few- and single-cycle pulses are powerful tools in different fields of science Today, third- and higher-order terms in the remnant spectral phase of the pulses remain a major obstacle for obtaining high-quality few- and single-cycle pulses from in-line post-compression setups. In this Letter, we show how input pulse shaping can successfully be applied to standard post-compression setups to minimize the occurrence of high-order phase components during nonlinear propagation and to directly...
6 Citations Source Cite
Published on Jun 1, 2017
J.A. San Román1
Estimated H-index: 1
(Grupo México),
E. Conejero Jarque (Grupo México)+ 5 AuthorsHelder Crespo12
Estimated H-index: 12
(University of Porto)
Intense few-to single-cycle pulses are a key tool for attosecond science and ultrafast spectroscopy, and are also enabling a new generation of compact laser-plasma accelerators [1], Achieving such short pulse durations is a challenging task as it requires not only the generation of very broad (potentially over octave-spanning) spectra but also the compensation of the spectral phase over such bandwidths, in order to get pulses as close as possible to their Fourier-transform limit. Presently, the ...
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Published on Jun 15, 2017in Physical Review A 2.91
W. Holgado3
Estimated H-index: 3
,
Carlos Hernández-García13
Estimated H-index: 13
+ 7 AuthorsÍñigo J. Sola12
Estimated H-index: 12
In this work we study the impact of chromatic focusing of few-cycle laser pulses on high-order-harmonic generation (HHG) through analysis of the emitted extreme ultraviolet (XUV) radiation. Chromatic focusing is usually avoided in the few-cycle regime, as the pulse spatiotemporal structure may be highly distorted by the spatiotemporal aberrations. Here, however, we demonstrate it as an additional control parameter to modify the generated XUV radiation. We present experiments where few-cycle puls...
1 Citations Source Cite
Published on Jun 1, 2017
Miguel Canhota1
Estimated H-index: 1
(University of Porto),
Francisco Silva15
Estimated H-index: 15
(University of Porto)
+ 1 AuthorsHelder Crespo12
Estimated H-index: 12
(University of Porto)
Intense single-cycle light pulses are very important tools for attosecond science and high-field physics, and are now enabling a new generation of compact kHz laser-plasma accelerators [1]. These pulses can be generated using several post-compression techniques [2-4] and their precise temporal characterization is crucial for optimizing the compression and for establishing the pulse profile and duration in an experiment. However, the over octave-spanning spectra and extremely short duration of th...
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Published on Aug 1, 2017in Optics Letters 3.59
Miguel Canhota1
Estimated H-index: 1
,
Francisco Silva15
Estimated H-index: 15
+ 1 AuthorsHelder Crespo12
Estimated H-index: 12
We present an implementation of dispersion-scan based on self-diffraction (SD d-scan) and apply it to the measurement of over octave-spanning sub-4-fs pulses. The results are compared with second-harmonic generation (SHG) d-scan. The efficiency of the SD process is derived theoretically and compared with the spectral response retrieved by the d-scan algorithm. The new SD d-scan has a robust inline setup and enables measuring pulses with over-octave spectra, single-cycle durations, and wavelength...
3 Citations Source Cite
Published on Jun 1, 2017
Francisco Silva15
Estimated H-index: 15
(University of Porto),
Íñigo J. Sola12
Estimated H-index: 12
(University of Salamanca)
+ 6 AuthorsCrina Cojocaru16
Estimated H-index: 16
(Polytechnic University of Catalonia)
The precise characterization of femtosecond laser pulses is as challenging as their generation and a topic of intense research. Dispersion-scan (d-scan) [1] is a recently established technique where the spectrum of a nonlinear signal, e.g., second-harmonic generation (SHG), is measured as a function of dispersion applied to the pulse. The spectral phase of the pulse can then be retrieved from the resulting 2D trace using an iterative algorithm. An important implementation of d-scan, based on a c...
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Published on Jan 1, 2016in Galicia Clínica
S. Tannira , Eunice Oliveira3
Estimated H-index: 3
+ 1 AuthorsA. Mello Silva
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