Giulio Maria Rossi

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We present FROG characterization of all three amplification channels of a two-stage sub-optical-cycle parametric waveform synthesizer covering more than two octaves in bandwidth. A flexible dispersion compensation scheme will permit compression at the multi-mJ level.
Waveform nonlinear optics aims to study and control the nonlinear interactions of matter with extremely short optical waveforms custom-tailored within a single cycle of light. Different technological routes to generate such multimillijoule sub-optical-cycle waveforms are currently pursued, opening up unprecedented opportunities in attoscience and(More)
We introduce a simple all-inline variation of a balanced optical cross-correlator (BOC) that allows to measure the arrival time difference (ATD), over the full Nyquist bandwidth, with increased common-mode rejection and long-term stability. An FPGA-based signal processing unit allows for real-time signal normalization and enables locking to any setpoint(More)
We present a highly automated front-end of a Ti:Sa-based optical waveform synthesizer capable of driving multiple supercontinua with stable and controlled carrier-envelope phases. The remarkable CEP-stability of 217 mrad rms single-shot will allow shot-to-shot and long-term stable waveform synthesis.
We present longitudinal-phase stability measurements between separate supercontinua generated in different bulk materials. The remarkably low relative phase jitter of few attoseconds allows multiple-white-light seeding schemes for flexible and ultrabroadband optical parametric waveform synthesizers.
Stable ultra-broadband pulse generation via Kerr-lens mode locking (KLM) paves the way for scientific explorations in many fields, such as optical metrology, study of ultrafast dynamics, and nonlinear light microscopy. For example, Ti:sapphire laser oscillators, capable of generating octave-spanning spectra with potentially close-to-single-cycle waveforms,(More)
The various higher-harmonic orders generated in solids exhibit qualitatively different sensitivity to driver-pulse ellipticity, resulting from a different response of intraband and interband dynamics. Non-zero driver-pulse ellipticity permits harmonic cutoff extension and circularly polarized higher-harmonics.
Recently, we introduced an ab-initio time-dependent density-functional theory (TDDFT) framework that allows us to investigate the coupled interplay between the interband and intraband mechanisms of high-harmonic generation (HHG) from solids [1] without making a-priori model assumptions or strong approximations. Here, using HHG experiments on bulk silicon(More)
We introduce an all-inline scheme for relative timing measurement of ultrabroadband pulses, featuring FPGA-based detection/feedback. High common-mode rejection and long-term stability were validated by out-of-loop measurement, paving the way for ultrabroadband optical parametric waveform synthesis.