The dual-beam (pump, probe) time-resolved Z-scan technique is used to study the
thermal changes in refractive index that are due to one- and two-photon
absorption in organic solvents. The time resolution enabled us to select a pure
thermal signal and to measure absolute variations as small as
10−6 that were due to heating. Gaussian approximation was
used for the pump and probe beams to fit experimental and calculated model
© 1994 Optical Society of America
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