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The spin response of a dilute magnetic Ga0.94Mn0.06As semiconductor sample subject to femtosecond photoexcitation is observed by mid-infrared differential transmittance. A slow rise-time in the hundreds of picoseconds timescale is found.
Terahertz emission is observed from ferromagnetic GaMnAs when the samples are excited at normal incidence with 3.1 eV, 130 fs laser pulses. We demonstrate experimentally that the radiation is directly related to the sample magnetization.
We propose and demonstrate a scheme for two-dimensional terahertz reflection imaging based on a phase-retrieval algorithm. This enables us to obtain simultaneously topographic images and the dielectric functions of a structured sample.
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