Extension of all-optical reconstruction method for isolated attosecond pulses using high-harmonic generation streaking spectra

TL;DR

This paper extends an all-optical spectral phase reconstruction method for isolated attosecond pulses, successfully retrieving complex spectral phases and the IR laser's carrier-envelope phase from high-harmonic generation streaking spectra.

Contribution

The paper introduces an improved retrieval algorithm capable of handling shaped IAPs with spectral minima and phase jumps, and demonstrates phase retrieval of high harmonics using streaking spectra.

Findings

Successfully reconstructed complex spectral phases of shaped IAPs.

Reconstructed the carrier-envelope phase of IR laser from streaking spectra.

Discussed phase retrieval of high harmonics using Fourier transform of streaking spectra.

Abstract

An all-optical method for directly reconstructing the spectral phase of isolated attosecond pulse (IAP) has been proposed recently [New J. Phys. 25, 083003 (2023)]. This method is based on the high-harmonic generation (HHG) streaking spectra generated by an IAP and a time-delayed intense infrared (IR) laser, which can be accurately simulated by an extended quantitative rescattering model. Here we extend the retrieval algorithm in this method to successfully retrieve the spectral phase of an shaped IAP, which has a spectral minimum, a phase jump about $\pi$, and a "split" temporal profile. We then reconstruct the carrier-envelope phase of IR laser from HHG streaking spectra. And we finally discuss the retrieval of the phase of high harmonics by the intense IR laser alone using the Fourier transform of HHG streaking spectra.