Abstract
Emission of ultrashort electromagnetic pulses from current-biased superconducting YBCO films has been observed by exciting with femtosecond laser pulses. The emission device is made of YBCO strip lines with a bridge at their center on an MgO substrate. The electric field of the pulse is detected by a photoconductive switch made of LT-GaAs. The emitted pulse width is /spl sim/0.5 psec and its Fourier component extends up to 2 THz. Characteristics of the THz emission such as bias current, pump power and temperature dependence are investigated in detail. The emission mechanism is ascribed to the ultrafast supercurrent modulation caused by the photoexcitation.
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