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报告人简介
Giulio Maria Rossi received his bachelor's and master's degrees in physics engineering from Politecnico di Milano (Milan, Italy) in 2011 and 2013 respectively. During that time, his research focused on ultrafast optical parametric amplifiers, pulse characterization techniques, and pump–probe spectroscopy. In 2013 he joined the UFOX group, CFEL, DESY, Germany, as PhD student. During the PhD, Giulio contributed to the realization of the first mJ-level Parametric Waveform Synthesizer (PWS). After the PhD he continued in the UFOX group as postdoc, focusing on the generation of isolated attosecond pulses via sub-cycle tailored waveforms. Since 2020 he is leading the attosecond team of the UFOX group, aiming at studying and controlling ultrafast dynamics in atoms and molecules.

报告摘要
The coherent synthesis of ultrashort pulses generated via optical parametric (chirped-pulse) amplification (OP(CP)A) opened a path to tailor the electric field waveform of intense optical pulses with unprecedented freedom. OP(CP)A allows for the generation of broadband pulses with scalable pulse energy, few-cycle duration, stable carrier-envelope phase (CEP) and spectrum tunable almost continuously over the visible-to-mid-IR region. The synthesized optical waveforms can be tailored by few key-paramenters: the common CEP and the relative phases (or relative delay) among the constituent pulses. Controlling these synthesis parameters allows to access a large variety of peak intensities and half-cycle field shapes and at the same time allows to fully characterize the electric field shape of all available waveforms in a fast and in-situ fashion.
In its current implementation, the synthesis of field-controlled ~3 fs long pulses covering the 650-2200 nm range with ~0.5 mJ of energy made it possible to gain control over the high-harmonic generation (HHG) process. In HHG, the use of non-sinusoidal waveforms shorter than a single optical cycle has a twofold advantage: (i) it ensures the generation of isolated attosecond pulses (IAPs) in a robust manner and without the need for spectral filtering (ii) it allows control over the central photon-energy, bandwidth and duration of IAPs in real time by controlling the synthesis parameters. This allowed to generate IAPs tunable over the 30-400 eV range and to adjust their duration duration (and bandwidth) between 80 and 240 as.

邀请人：杨煜东 研究员

联系人：万  源 特聘研究员

主办方：中国科学院物理研究所，松山湖材料实验室