Accurate convergence of transient-absorption spectra using pulsed lasers

Johanna Brazard, Laurie A. Bizimana, Daniel B. Turner

Research output: Contribution to journalArticle

Abstract

Transient-absorption spectroscopy is a common and well-developed technique for measuring time-dependent optical phenomena. One important aspect, especially for measurements using pulsed lasers, is how to average multiple data acquisition events. Here, we use a mathematical analysis method based on covariance to evaluate various averaging schemes. The analysis reveals that the baseline and the signal converge to incorrect values without balanced detection of the probe, shot-by-shot detection, and a specific method of averaging. Experiments performed with sub-7 fs pulses confirm the analytic results and reveal insights into molecular excited-state vibrational dynamics.

Original languageEnglish (US)
Article number053106
JournalReview of Scientific Instruments
Volume86
Issue number5
DOIs
StatePublished - May 1 2015

ASJC Scopus subject areas

  • Instrumentation

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