Abstract
Ultrafast optical dephasing measurements were performed on thin films of the oxazine dye Nile Blue in poly- [vinyl alcohol] (PVOH). The experimental technique used two-beam, time-delayed degenerate four-wave mixing (DFWM) with incoherent light.1−3 Small time delay oscillations in the DFWM signal were observed under the conditions that the sample was at relatively high temperatures (between 200° K and room temperature) and the measurements were made on the blue side of the Nile Blue inhomogeneous distribution. These conditions are consistent with relatively fast dephasing times.2 A comparison between the measured oscillation depth and a numerical simulation of the DFWM scattered intensity yields an estimate of the phase relaxation time. This technique offers a new method of measuring femtosecond dephasing times with applications to samples of broad homogeneous linewidths, at high temperatures or in highly interacting environments.
© 1998 Optical Society of America
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