✦ LIBER ✦

Observation of Phonon Resonances in the Optical Nonlinearity in an α-Sexithienyl Thin Film

✍ Scribed by G. Urbasch; H. Giessen; M. Murgia; R. Zamboni; R.F. Mahrt

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 89 KB
Volume: 221
Category: Article
ISSN: 0370-1972
DOI: 10.1002/1521-3951(200009)221:1<561::aid-pssb561>3.0.co;2-q

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✦ Synopsis

Phonon resonances in the optical nonlinearity induced by the mixing of pump and probe pulses are investigated in an a-sexithienyl vacuum evaporated thin film. We have performed femtosecond differential transmission spectroscopy at room temperature and at 20 K using excitation energies from 2.14 to 2.4 eV. We observe simultaneously an induced transmission at the Stokes and at the anti-Stokes energetic position of the pump pulse which is only present during the temporal overlap of the pump and the probe pulse. The phonon associated with the C=C stretching mode of a-sexithienyl is involved in the coherent light±matter interaction for both the stimulated inverse Raman scattering at the anti-Stokes energetic position and for the Raman gain at the Stokes energetic position.

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