Abstract
We proposed a novel Superconductive Optical Flux Trap (SOFT) memory for femtosecond (fs) optical pulse detection. Although the amount and the polarity of magnetic flux in a high-Tc superconductive thin film loop are controllable by modulating the supercurrent with fs optical pulses, the process requires a large amount of the trapped flux to diagnose its controllability. This results in a poor sensitivity for the fs pulse detection. The superconductive loop memory combined with a dc-SQUID readout circuit was designed to improve the sensitivity. The designed memory cell is either inductively coupled to the SQUIDs or directly incorporated in the pickup loop of the SQUID with a configuration of magnetometer or galvanometer type. We discuss the resolution of the SQUID readout for the trapped flux quanta in the memory and the sensitivity for the fs laser intensity.
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