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 language | English (US) |
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| Title of host publication | XVII International Conference on Quantum Electronics. Digest of |
| Publisher | Publ by IEEE |
| State | Published - 1990 |
| Event | 17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA Duration: May 21 1990 → May 25 1990 |
Other
| Other | 17th International Conference on Quantum Electronics - IQEC '90 |
|---|---|
| City | Anaheim, CA, USA |
| Period | 5/21/90 → 5/25/90 |
ASJC Scopus subject areas
- General Engineering