Abstract

We report the observation of an ultrafast photoresponse of a high-Tc film to far-infrared radiation pulses. The response of a sample, consisting of a current-carrying structured YBa2Cu3O7−δ film cooled to liquid-nitrogen temperature, was studied by use of ultrashort laser pulses from an optically pumped far-infrared laser in the frequency range from 0.7 to 7 THz. We found that the response time was limited by the time resolution, 120 ps, of our electronic registration equipment.

© 1993 Optical Society of America

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