Abstract
We observe terahertz radiation from Y 0.7Pr 0.3Ba 2Cu 3O 7 (YPBCO) thin films excited with femtosecond optical pulses, and compare its waveform and efficiency with those from YBa 2Cu 3O 7−gd (YBCO). It is found that YPBCO can produce much stronger radiation than YBCO. We discuss the origin of the enhancement as well as the temperature dependence of the emission properties.
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