Rapid acquisition of broadband two-dimensional electronic spectra by continuous scanning with conventional delay lines

Austin P. Spencer*, Lin X. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A passively phase-stable, broadband (∼7 fs, >2000 cm−1) two-dimensional (2D) electronic spectroscopy apparatus that achieves rapid acquisition rates by continuously—rather than step-wise—scanning the Fourier-transform dimension is demonstrated for the first time, to the best of our knowledge. This is made possible through use of a partially common path interferometer design in which the coherence time τ is sampled in a “rotating frame.” Rapid, continuous scanning of τ increases the duty cycle of signal collection, rejects the majority of excitation pulse scatter, and enables the measurement of a complete 2D spectrum in 92 ms, which minimizes the influence of pulse intensity and delay fluctuations on the 2D spectrum. In practice, these improvements make possible the acquisition of hundreds of 2D spectra in tens of minutes, which opens the door to dense sampling of ultrafast relaxation dynamics and to generating extremely broadband 3D Fourier-transform spectra.

Original languageEnglish (US)
Pages (from-to)2942-2945
Number of pages4
JournalOptics Letters
Volume45
Issue number10
DOIs
StatePublished - May 15 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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