Abstract

Optical dephasing measurements using degenerate four-wave mixing (DFWM) were performed on thin dye–polymer films at room temperature. Incoherent light centered at 575 nm was used as a source for ultrafast measurements on the blue side of the inhomogeneous distribution of the oxazine dye Nile Blue. Under these conditions, a new form of interference was observed as a sinusoidal variation of the DFWM signal versus delay time. A measured interference period of $1.96\pm 0.07 \mathrm{fs}$ corresponds to the optical cycle time of the light source. Numerical solutions for the DFWM intensity confirm the oscillation effect and estimate a measured dephasing time of 2–3 fs.

© 1998 Optical Society of America

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