J. Castillo et al., THERMAL LENSING RESULTING FROM ONE-PHOTON AND 2-PHOTON ABSORPTION STUDIED WITH A 2-COLOR TIME-RESOLVED Z SCAN, Optics letters, 19(3), 1994, pp. 171-173
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 enable
d us to select a pure thermal signal and to measure absolute variation
s as small as 10(-6) that were due to heating. Gaussian approximation
was used for the pump and probe beams to fit experimental and calculat
ed model dependencies.