Four Wave Mixing Spectroscopy at the Interface Between the Time and Frequency Domains

TL;DR

This paper introduces a novel Four Wave Mixing spectroscopy method that combines spectral and time resolution without traditional spectrometers or delay scanning, enhancing analysis capabilities at the interface of time and frequency domains.

Contribution

The work presents a new approach to Four Wave Mixing spectroscopy using phase matching filtering for spectral selectivity and single-pulse time resolution, including the identification of a previously unconsidered Feynman diagram.

Findings

Spectral selectivity achieved without a spectrometer

Time-resolved signals obtained within a single pulse

Identification of a necessary counter-rotating Feynman diagram

Abstract

Combined spectrally and time resolved measurements provide information not otherwise available if performed in either domain alone. We demonstrate a new approach to Four Wave Mixing spectroscopy, where spectral selectivity is achieved by phase matching filtering without a spectrometer, and the time resolved signal is obtained within a single pulse and without mechanically scanning any delays. We analyze the Degenerate Four Wave Mixing signal, and show that a counter-rotating Feynman diagram not previously considered is necessary in order to understand the measured frequency and time resolved spectrograms.