A Dual-Sideband Attosecond Interferometry Setup

TL;DR

This paper details an experimental setup for attosecond photoionization delay measurements using a dual-sideband RABBITT technique with high precision synchronization.

Contribution

It introduces a novel dual-sideband RABBITT setup with active delay stabilization and phase-dependent sideband oscillation observation.

Findings

Achieved 45 as timing precision in measurements.

Observed sideband oscillations dependent on carrier-envelope phase.

Demonstrated synchronization of EUV and IR pulses for attosecond experiments.

Abstract

We present the development and implementation of an experimental setup designed to investigate attosecond photoionization delays using a dual-sideband RABBITT (Reconstruction of Attosecond Beating By Interference of Two-Photon Transitions) technique. The setup utilizes an attosecond extreme ultraviolet source from high-harmonic generation driven by a carrier-envelope-phase-stabilized Ti:sapphire laser centered at 800 nm. The extreme ultraviolet radiation is synchronized with a 1200 nm infrared probe pulse generated via a non-collinear optical parametric amplifier. Active delay stabilization by means of a spectrally resolved interferometer signal achieves 45 as root-mean-square timing precision and enables the observation of sideband oscillations. Taking advantage of the dependence of the sideband signal on the carrier-envelope phase of the driving field, we report sideband-yield oscillations as a function of this parameter.