Femtosecond two-photon absorption measurements based on the accumulative photothermal effect and the Rayleigh interferometer
Abbreviated Journal Title
EXCITATION CROSS-SECTIONS; HIGH-REPETITION-RATE; SENSITIVE MEASUREMENT; NM; LIQUIDS; CS2; Optics
A rapid, straightforward method for measuring the two-photon absorption cross sections in liquid samples based on both the accumulative photo-thermal effect and the Rayleigh interferometery is described and demonstrated. This technique combines the sensitivity of the thermal lens approach and the accuracy of interferometry techniques. Focusing a high repetition rate laser beam in the sample, generating a localized change in its refractive index, induces the photo-thermal phase shift. By recording and processing two interference patterns, this technique allows the rapid estimation of the two-photon absorption cross section of the sample. Significantly, the experimental results demonstrate that this new method can be used with both fluorescent and non-fluorescent samples. (C) 2009 Optical Society of America
"Femtosecond two-photon absorption measurements based on the accumulative photothermal effect and the Rayleigh interferometer" (2009). Faculty Bibliography 2000s. 2064.