Abstract
Saturation of two- and three-photon absorption has been studied in three dye-solution samples excited with 160-fs laser pulses of 775- and 1280-nm wavelengths, respectively. The effective two- and three-photon absorption coefficients measured for a given sample are not material constants, but dependent on the levels of input laser intensity. These saturation phenomena can be well interpreted by considering the depletion of ground-state population upon strong ultra-short multiphoton excitation. The approximate expressions of effective two- and three-photon absorption coefficients and their intensity dependence are proposed, based on which the experimental results can be well fitted and the saturation parameters for a given sample can be readily determined.
| Original language | English |
|---|---|
| Article number | 083108 |
| Journal | Journal of Applied Physics |
| Volume | 101 |
| Issue number | 8 |
| DOIs | |
| State | Published - 2007 |
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