Characterization of particulates using ultra-short laser pulses

Chris J. Lee, Petra Groß, Peter J M Van Der Slot, Klaus J. Boller

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Here we propose a novel time-domain method for the real-time characterization and analysis of scatterings samples, which separates out different sample properties, such as the particle size distribution and packing fraction (the density of scatterers), and absorption. The method is based on measuring the temporal shape of ultrashort light pulses scattered through the sample. By using a temporal random walk approach based on the characteristic size distribution and packing fraction of the sample, we predict the temporal dispersion of the input pulses, i.e. their stretching into particular shapes and the generation of echoes. So far our results are obtained under the coarse approximation that the mean free path is equal to the particle size in the peak of their distribution, however, our results are in qualitative agreement with results published previously. For example, assuming Gaussian input pulses with 50 fs (FWHM) duration, our analysis shows that the temporal shape of the first scattered pulse replicates and thereby reveals the particle size distribution. Furthermore, the delay between the initial peak and subsequent peaks depends on the packing fraction and average particle size. We also show that these results are independent of absorption features. This approach appears promising for the characterization of mixtures of pharmaceutical particulates with time resolved scattering of fs-pulses.
Original languageEnglish
Title of host publication2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, CLEO
Place of PublicationMunich, Germany
DOIs
Publication statusPublished - 1 Dec 2007
EventEuropean Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference 2007 - International Congress Centre Munich, Munich, Germany
Duration: 17 Jun 200722 Jun 2007

Publication series

NameConference on Lasers and Electro-Optics Europe - Technical Digest

Conference

ConferenceEuropean Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference 2007
Abbreviated titleCLEO/Europe IQEC
CountryGermany
CityMunich
Period17/06/0722/06/07

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