Springer (part of Springer Nature), Applied Physics B: Lasers and Optics, 2(104), p. 307-319
DOI: 10.1007/s00340-011-4449-8
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To investigate the transient change of soot optical properties resulting from pulsed laser heating of soot in a cooled exhaust plume we have simultaneously performed cw light extinction at 405 and 830 nm and elastic light scattering at 1064 nm. A reversible increase to the 830-nm light extinction of up to 7%, observed during the time period where the soot was hot, suggests a temperature-dependent light absorption refractive index function, E(m λ ). At low fluence, small permanent increases of E(m λ ) of