FEL investigations of energy transfer in condensed phase systems

Don Otto Henderson; Richard Mu; Enrique Silberman; J. Bruce Johnson; Glenn S. Edwards

doi:10.1117/12.148033

14 July 1993 FEL investigations of energy transfer in condensed phase systems

Don Otto Henderson, Richard Mu, Enrique Silberman, J. Bruce Johnson, Glenn S. Edwards

Proceedings Volume 1854, Free-Electron Laser Spectroscopy in Biology, Medicine, and Materials Science; (1993) https://doi.org/10.1117/12.148033
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The vibrational dynamics of O-H groups in fused silica have been examined by a time- resolved pump-probe technique using the Vanderbilt Free Electron Laser (FEL). We consider two effects, local heating and transient thermal lensing, which can influence measured T₁ values in one color pump-probe measurements. The dependence of these two effects on both the micropulse spacing and the total number of micropulses delivered to the sample are analyzed in detail for the O-H/SiO₂ system. The results indicate that transient thermal lensing can significantly influence the measured probe signal. The local heating may cause thermally induced changes in the ground state population of the absorber, thereby complicating the analysis of the relaxation dynamics.

Citation Download Citation

Don Otto Henderson, Richard Mu, Enrique Silberman, J. Bruce Johnson, and Glenn S. Edwards "FEL investigations of energy transfer in condensed phase systems", Proc. SPIE 1854, Free-Electron Laser Spectroscopy in Biology, Medicine, and Materials Science, (14 July 1993); https://doi.org/10.1117/12.148033

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