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Time-gated pre-resonant femtosecond stimulated Raman spectroscopy of diethylthiatricarbocyanine iodide

Title
Time-gated pre-resonant femtosecond stimulated Raman spectroscopy of diethylthiatricarbocyanine iodide
Authors
Kim, HM[Kim, Hyung Min]Kim, H[Kim, Hyunmin]Yang, I[Yang, Ilseung]Jin, SM[Jin, Seung Min]Suh, YD[Suh, Yung Doug]
DGIST Authors
Kim, H[Kim, Hyunmin]
Issue Date
2014
Citation
Physical Chemistry Chemical Physics, 16(11), 5312-5318
Type
Article
Article Type
Article
Keywords
CarbocyanineCarbocyaninesChemistryDiethylthiotricarbocyanine IodideMethodologyRaman SpectrometrySpectrum Analysis, Raman
ISSN
1463-9076
Abstract
We present time-gated femtosecond stimulated Raman spectroscopy (fSRS) under the pre-resonance Raman conditions of diethylthiatricarbocyanine (DTTC) iodide. A 'pseudo emission-free' condition is achieved by delivering the probe beam ahead of the pump beam. Regeneratively amplified pulse trains are employed to create an angle-geometry (non-collimated) mixing between the pump and probe beams, leading to highly sensitive measurement of the stimulated Raman gain. Time-integrated spectroscopy allows for a more quantitative distinction between the contributions of stimulated Raman scattering and stimulated emission. We successfully obtain a highly sensitive (signal-to-noise ratio >100) stimulated Raman spectrum under the optimized conditions, which compares favourably to results obtained using two-dimensional correlation spectroscopy (2DCOS). Given the optical pre-resonance of ∼0.1 eV, the background signals mostly originate from the stimulated emission of excited electrons and are significantly reduced by partial overlapping of the pump and probe beams; a genuine fSRS spectral profile is obtained for a temporal delay of ∼0.2 ps between the two beams. © 2014 the Owner Societies.
URI
http://hdl.handle.net/20.500.11750/2411
DOI
10.1039/c3cp54870h
Publisher
Royal Society of Chemistry
Related Researcher
Files:
There are no files associated with this item.
Collection:
Companion Diagnostics and Medical Technology Research Group1. Journal Articles


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