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Refined Ptychographic Reconstruction of Attosecond Pulses

by 1,2,* and 1,2
Department of Physics, Politecnico di Milano, 20133 Milano, Italy
Institute for Photonics and Nanotechnologies, IFN-CNR, 20133 Milano, Italy
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2563;
Received: 8 November 2018 / Revised: 29 November 2018 / Accepted: 6 December 2018 / Published: 10 December 2018
(This article belongs to the Special Issue Attosecond Science and Technology: Principles and Applications)
Advanced applications of attosecond pulses require the implementation of experimental techniques for a complete and accurate characterization of the pulse temporal characteristics. The method of choice is the frequency resolved optical gating for the complete reconstruction of attosecond bursts (FROG-CRAB), which requires the development of suitable reconstruction algorithms. In the last few years, various numerical techniques have been proposed and implemented, characterized by different levels of accuracy, robustness, and computational load. Many of them are based on the central momentum approximation (CMA), which may pose severe limits in the reconstruction accuracy. Alternative techniques have been successfully developed, based on the implementation of reconstruction algorithms which do not rely on this approximation, such as the Volkov-transform generalized projection algorithm (VTGPA). The main drawback is a notable increase of the computational load. We propose a new method, called refined iterative ptychographic engine (rePIE), which combines the advantages of a robust algorithm based on CMA, characterized by a fast convergence, with the accuracy of advanced algorithms not based on such approximation. The main idea is to perform a first fast iterative ptychographic engine (ePIE) reconstruction and then refine the result with just a few iterations of the VTGPA in order to correct for the error introduced by the CMA. We analyse the accuracy of the novel reconstruction method by comparing the residual error (i.e., the difference between the reconstructed and the simulated original spectrograms) when VTGPA, ePIE, and rePIE reconstructions are employed. We show that the rePIE approach is particularly useful in the case of short attosecond pulses characterized by a broad spectrum in the vacuum-ultraviolet (VUV)–extreme-ultraviolet (XUV) region. View Full-Text
Keywords: attosecond science; ultrafast phenomena; ultrafast optics attosecond science; ultrafast phenomena; ultrafast optics
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MDPI and ACS Style

Lucchini, M.; Nisoli, M. Refined Ptychographic Reconstruction of Attosecond Pulses. Appl. Sci. 2018, 8, 2563.

AMA Style

Lucchini M, Nisoli M. Refined Ptychographic Reconstruction of Attosecond Pulses. Applied Sciences. 2018; 8(12):2563.

Chicago/Turabian Style

Lucchini, Matteo, and Mauro Nisoli. 2018. "Refined Ptychographic Reconstruction of Attosecond Pulses" Applied Sciences 8, no. 12: 2563.

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