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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, Hyung MinKim, HyunminYang, IlseungJin, Seung MinSuh, Yung Doug
DGIST Authors
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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