Terahertz (THz) radiation is generated from biased YBa 2 Cu 3 O 7-δ (YBCO)-film photoswitches by exciting them with femtosecond (fsec) laser pulses. The pump power, bias current and temperature dependence of the radiation amplitude is measured in order to characterize the emission properties of the high-critical-temperature (high- T C ) superconducting photoswitches. The radiation amplitude increases superlinearly with increasing pump power in the moderate pump power range and saturates at high pump power. The bias current dependence of the radiation amplitude shows superlinear increase for high bias current. The temperature dependence of the radiation amplitude increases with increasing temperature except near the critical temperature. The features observed in the measurements are explained by the thermal and transient changes of the complex refractive index, which affects the output coupling efficiency of the THz radiation from the high- T C superconducting film to the free space.
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Tani et al. (1997) studied this question.
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