Pulsed diffusing-wave spectroscopy: High resolution through nonlinear optical gating

A. G. Yodh, P. D. Kaplan, D. J. Pine

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A pulsed diffusing-wave spectroscopy (PDWS) probe that was developed and used to study particle diffusion in colloids of very high concentration is reported. The scheme exploits the phase fluctuations of optically gated photons, enabling the experimenter to isolate the contributions of photons that travel a single specified length through the media. By eliminating the average over photon pathways, PDWS simplifies the interpretation of a typical measurement and renders effects such as sample absorption and experimental geometry unimportant. The basic experimental setup for PDWS is described, and typical upconverted intensity autocorrelation functions are plotted. The observed exponential decay typically does not arise in conventional DWS. Data illustrate that these decay rates depend linearly on the reference arm delay, as predicted by the original DWS theories.

Original languageEnglish (US)
Title of host publicationXVII International Conference on Quantum Electronics. Digest of
PublisherPubl by IEEE
StatePublished - 1990
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990

Other

Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA
Period5/21/905/25/90

ASJC Scopus subject areas

  • Engineering(all)

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    Yodh, A. G., Kaplan, P. D., & Pine, D. J. (1990). Pulsed diffusing-wave spectroscopy: High resolution through nonlinear optical gating. In XVII International Conference on Quantum Electronics. Digest of Publ by IEEE.