Terahertz radiation from high-Tc superconducting films excited by femtosecond optical pulses

Masanori Hangyo

doi:10.1117/12.271206

15 April 1997 Terahertz radiation from high-Tc superconducting films excited by femtosecond optical pulses

Masanori Hangyo

Proceedings Volume 2999, Photodetectors: Materials and Devices II; (1997) https://doi.org/10.1117/12.271206
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Ultrashort electromagnetic pulses with approximately 0.5 ps width have been radiated into free space from current biased superconducting YBa₂Cu₃O₇ (YBCO) films by exciting femtosecond laser pulses. The Fourier spectrum of them extends up to approximately 3 THz. The characteristics of the radiation are studied in detail and the mechanism of the radiation is discussed in relation to the relaxation of photoexcited quasi particles By the improvement of the device structure and the collecting optics, the radiation power can be increased to approximately 0.5 (mu) W. A new type THz radiation from YBCO films under an external magnetic field or in the flux-trapped state is found and its preliminary result is described.

Citation Download Citation

Masanori Hangyo "Terahertz radiation from high-Tc superconducting films excited by femtosecond optical pulses", Proc. SPIE 2999, Photodetectors: Materials and Devices II, (15 April 1997); https://doi.org/10.1117/12.271206

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