Mitigation of stimulated Raman amplification artifact in transient absorption spectroscopy

Artifacts due to nonlinear optical processes like ”Cross Phase Modulation (XPM)”, ”Stimulated Raman Amplification (SRA)”, and ”Two-Photon Absorption (TPA)” etc., have a detrimental effect on Transient Absorption Spectroscopy (TAS). In this study, we investigate the transient response of distilled wa...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2024-08, Vol.130 (8), Article 146
Main Authors: Roy, Nirankush, Karmakar, Ayon Jyoti, Datta, Prasanta Kumar
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Amplification
Chirp
Distilled water
Engineering
Lasers
Nonlinear optics
Optical data processing
Optical Devices
Optics
Phase modulation
Photon absorption
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Sapphire
Scattering
Silver
Spectrum analysis
Transient response
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Summary:Artifacts due to nonlinear optical processes like ”Cross Phase Modulation (XPM)”, ”Stimulated Raman Amplification (SRA)”, and ”Two-Photon Absorption (TPA)” etc., have a detrimental effect on Transient Absorption Spectroscopy (TAS). In this study, we investigate the transient response of distilled water to explore the nature of SRA artifacts. The supercontinuum probe, generated in a sapphire crystal pumped by 808 nm, 50 fs laser pulse, is approximated as a linearly chirped Gaussian with a chirp parameter of 36. The chirp in the probe affects the TAS data, because the different spectral components of the probe arrive at different times, even at zero delay. The process of eliminating the effect of this chirp on the TAS data is successfully implemented. The method presented here will be useful to correct the dynamics of several processes of light-matter interactions such as coherence phenomena, electron–electron scattering and electron–phonon scattering. We successfully eliminated the SRA artifact from the TA dynamics of silver nanoparticles dispersed in water. Also, the imaginary part of the third-order nonlinear susceptibility ( χ Im ( 3 ) ) of water is extracted to be 2.088 × 10 - 23 m 2 / V 2 , using the SRA artifacts.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-024-08284-z