Asymmetric double-pulse interferometric FROG for visible-wavelength time-domain spectroscopy

To extend the detection range of time-domain spec-troscopy into the challenging visible frequencies, we propose an interferometry-type frequency-resolved optical gating (FROG). Our numerical simulation shows that, when oper-ating in a double-pulse scheme, a unique phase-locking mechanism can be activated and preserves both zero -and first-order phases ((P0, (P1)-indispensable for phase -sensitive spectroscopic study-that are otherwise inacces-sible to standard FROG measurement. Followed by time -domain signal reconstruction and analysis protocol, we show that time-domain spectroscopy with sub-cycle tem-poral resolution is enabled and well suits the need of a ultrafast-compatible and ambiguity-free method for com-plex dielectric function measurement at visible wavelengths. (c) 2022 Optica Publishing Group