Abstract
Ultrashort elctromagnetic pulses with time width of -0.5 ps are emitted from high temperature superconducting films by exciting with femtosecond laser pulses. The Fourier spectrum of them extends from 0.1 to 3 THz. The characteristics of the radiation are described in detail including various properties of the radiation related to magnetic fields. Various possible applications of this phenomenon are proposed and demonstrated. We propose a new field of “superconducting optoelectronics”, in which ultrafast optoelectronics and superconducting electronics are combined.
