Parametric Waveform Synthesis: a scalable approach to generate sub-cycle optical transients

TL;DR

This paper introduces a scalable parametric waveform synthesis method for generating controllable, sub-cycle optical pulses across visible to infrared wavelengths, advancing ultrafast light source technology.

Contribution

It presents the main components and design principles of PWS technology, validated through modeling and experiments, enabling reliable generation of high-energy, few-femtosecond pulses.

Findings

PWS can generate mJ-level, few-femtosecond pulses.

The system achieves stable, controllable sub-cycle waveforms.

Experimental results match analytical and numerical models.

Abstract

The availability of electromagnetic pulses with controllable field waveform and extremely short duration, even below a single optical cycle, is imperative to fully harness strong-field processes and to gain insight into ultrafast light-driven mechanisms occurring in the attosecond time-domain. The recently demonstrated parametric waveform synthesis (PWS) introduces an energy-, power- and spectrum-scalable method to generate non-sinusoidal sub-cycle optical waveforms by coherently combining different phase-stable pulses attained via optical parametric amplifiers. Significant technological developments have been addressed to overcome the stability issues related to PWS and to obtain an effective and reliable waveform control system. Here we present the main ingredients enabling PWS technology. The design choices concerning the optical, mechanical and electronic setups are justified by analytical/numerical modeling and benchmarked by experimental observations. In its present incarnation, the PWS technology enables the generation of field-controllable mJ-level few-femtosecond pulses spanning the visible to infrared range.