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21 October 1992 Fast nonbolometric photoresponse of YBa2Cu3O7-δ films
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Current biased films of YBa2Cu3O7-(delta ) are illuminated by short (300 fsec) pulses of variable fluence laser light. Transient voltages are measured over the temperature range 10 K < T < 250 K. Near Tc a bolometric response is observed, but below Tc signals are observed, with characteristic decay times of the order of hundreds of psec, that cannot be explained by a bolometric mechanism. Furthermore, a fast precursor, with full width of tens of ps, is observed when the bias current approaches the critical current. These signals are characterized and discussed.
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Mark Johnson "Fast nonbolometric photoresponse of YBa2Cu3O7-δ films", Proc. SPIE 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors, (21 October 1992);

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