Dual echelon femtosecond single-shot spectroscopy

Taeho Shin, Johanna W. Wolfson, Samuel W. Teitelbaum, Maria Kandyla, Keith A. Nelson

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We have developed a femtosecond single-shot spectroscopic technique to measure irreversible changes in condensed phase materials in real time. Crossed echelons generate a two-dimensional array of time-delayed pulses with one femtosecond probe pulse. This yields 9 ps of time-resolved data from a single laser shot, filling a gap in currently employed measurement methods. We can now monitor ultrafast irreversible dynamics in solid-state materials or other samples that cannot be flowed or replenished between laser shots, circumventing limitations of conventional pump-probe methods due to sample damage or product buildup. Despite the absence of signal-averaging in the single-shot measurement, an acceptable signal-to-noise level has been achieved via background and reference calibration procedures. Pump-induced changes in relative reflectivity as small as 0.2%-0.5% are demonstrated in semimetals, with both electronic and coherent phonon dynamics revealed by the data. The optical arrangement and the space-to-time conversion and calibration procedures necessary to achieve this level of operation are described. Sources of noise and approaches for dealing with them are discussed.

Original languageEnglish (US)
Article number083115
JournalReview of Scientific Instruments
Volume85
Issue number8
DOIs
StatePublished - Aug 2014
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation

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