We report a pump and probe terahertz (THz) excitation technique to investig
ate the ultrafast carrier dynamics in YBa2Cu3O7-x (YBCO). THz pulses genera
ted by laser-induced supercurrent modulation are used to probe the time res
olved evaluation of the THz emission. The technique is revealed to allow us
to study the carrier dynamics, such as fast THz field screening effect ins
ide the YBCO film and changes in the electrodynamics due to Cooper pair bre
aking and hot carrier excitation, and so on. (C) 2001 Elsevier Science BY.
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