“…5 However, a response with fast recovery time is required for broadband detectors, microwave generation, laser-microwave intermixing, and other applications for electronic devices. 8,10,11 Tl-based HTS devices, on the other hand, may be more attractive than the YBCO devices because of their higher T c s. This is a systematic study on obtaining a picosecond transient from an optically thick Tl 2 Ba 2 CaCu 2 O 8 or Tl 0.5 Pb 0.5 Sr 2 ͑Ca 0.8 Y 0.2 ͒Cu 2 O 7 film triggered by ϳmJ/cm 2 laser pulse. 12,13 The electrical measurements of the response times of 16 -40 ps have been reported on YBa 2 Cu 3 O 7Ϫץ ͑YBCO͒ thin films triggered by ϳJ/cm 2 laser pulses.…”