Triggering pulse durations in transferred electron devices

Pairs of 1.0 ps optical pulses, each focused onto a different region of a planar GaAs transferred electron device, were separated by a variable delay time ¿ to initiate and then inhibit dipole domain formation. The minimum pulse durations which could trigger domains were thus observed; the minimum value of ¿ which generated domains in the device studied was 7 ± 3 ps.