Femtosecond two-photon absorption measurements based on the accumulative photo-thermal effect and the Rayleigh interferometer | Zendy

Luis G. Rodríguez | Zendy; Hyo-Yang Ahn | Zendy; Kevin D. Belfield | Zendy

Open Access

Femtosecond two-photon absorption measurements based on the accumulative photo-thermal effect and the Rayleigh interferometer

Author(s) -

Luis G. Rodríguez,

Hyo-Yang Ahn,

Kevin D. Belfield

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.019617

Subject(s) - optics , femtosecond , interferometry , materials science , refractive index , interference (communication) , absorption (acoustics) , rayleigh scattering , laser , two photon absorption , lens (geology) , thermal , physics , channel (broadcasting) , electrical engineering , meteorology , engineering

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.

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