All-optical retrieval of the global phase for two-dimensional Fourier-transform spectroscopy

TL;DR

This paper introduces an all-optical method combining interference patterns and spectral interferometry to determine the global phase in two-dimensional Fourier-transform spectroscopy, applicable to various polarization configurations.

Contribution

It presents a novel all-optical technique for global phase retrieval in 2DFT spectroscopy, eliminating the need for spectrally resolved transient absorption in certain cases.

Findings

The all-optical method accurately retrieves the global phase.

It works for both co-linear and cross-linear polarization configurations.

The technique is validated against existing methods.

Abstract

A combination of spatial interference patterns and spectral interferometry are used to find the global phase for non-collinear two-dimensional Fourier-transform (2DFT) spectra. Results are compared with those using the spectrally resolved transient absorption (STRA) method to find the global phase when excitation is with co-linear polarization. Additionally cross-linear polarized 2DFT spectra are correctly phased using the all-optical technique, where the SRTA is not applicable.