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An electro-optical sampling technique for high-field conductivity measurement was proposed and electron drift velocity in delta -doped GaAs samples was measured. The authors measured the velocity-field characteristics of 2-DEG in delta -doped structures with DC pulses as short as 30 ps. A Nd3+:YAlO3 laser system was used in the experiments. For stabilising the laser pulse energy the system was equipped with a special Q-switch and a fast electronic feedback loop inside the laser cavity.