Abstract

In this work we study the time resolved spectroscopy of oligomers of phenylene ethynylene (OPE) and phenylene vinylene (OPV) using femtosecond pulses. They both display large fluorescent emissions, similar to their corresponding polymers,¹ and they can be grown as thin films with an important degree of orientation. We performed pump-probe experiments using a Ti:Saphire laser amplified at 5 kHz. Part of the beam is doubled in a BBO crystal to generate 150 fs pump pulses at 400 nm, another part is used to generate a dispersion compensated spectral continuum. The differential transmission ΔT/T(λ, τ) is measured as a function of the probe wavelength λ and pump-probe delays τ with an OMA detector or a synchronous detection.

© 1999 Optical Society of America