W. Dennis, W. Blau, D. Bradley, R. Schulz, N. Rau, C. Plachetta
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Degenerate four-wave mixing of picosecond light pulses in soluble polydiacetylenes
Optical phase conjugation by degenerate four-wave mixing of picosecond light pulses in polydiacetylene solutions has been observed with reflectivities up to 600%. The coupling mechanisms are ultrafast Kerr-like nonlinear susceptibility and thermally induced refractive index changes.