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Koichi AKIYAMA Nobuyuki TOMITA Yoshinori NOMURA Toshiro ISU Hajime ISHIHARA Kikuo CHO
We demonstrate a large nonlinear optical response of GaAs thin films using degenerate four-wave mixing (DFWM) with picosecond pulses. The obtained DFWM signal is thickness-dependent and peaks at around 110 nm. The nonlocal theory fully explains these results.