Details

Autor(en) / Beteiligte

• Wei, T. H.
• Hagan, D. J.
• Sence, M. J.
• Van Stryland, E. W.
• Perry, J. W.
• Coulter, D. R.

Titel

Direct measurements of nonlinear absorption and refraction in solutions of phthalocyanines

Ist Teil von

• Applied physics. B, Lasers and optics, 1992-01, Vol.B 54 (1), p.46-51

Ort / Verlag

Legacy CDMS: Springer

Erscheinungsjahr

1992

Quelle

SpringerLINK Contemporary (Konsortium Baden-Württemberg)

Beschreibungen/Notizen

• Direct measurements are reported of the excited singlet-state absorption cross section and the associated nonlinear refractive cross section using picosecond pulses at 532 nm in solutions of phthalocyanine and naphthalocyanine dyes. By monitoring the transmittance and far-field spatial beam distortion for different pulsewidths in the picosecond regime, it is shown that both the nonlinear absorption and refraction are fluence (energy-per-unit-area) rather than irradiance dependent. Thus, excited-state absorption is the dominant nonlinear absorption process, and the observed nonlinear refraction is also due to real population excitation.