Emission properties of YBa2Cu3O7-delta-film photoswitches as Terahertz radiation sources

被引：23

作者：

Tani, M ^{[1
]}

Tonouchi, M ^{[1
]}

Hangyo, M ^{[1
]}

Wang, Z ^{[1
]}

Onodera, N ^{[1
]}

Sakai, K ^{[1
]}

机构：

[1] OSAKA UNIV,RES CTR SUPERCONDUCTING MAT & ELECT,SUITA,OSAKA 565,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1997年 / 36卷 / 3B期

关键词：

YBCO photoswitch; femtosecond laser; THz radiation; ultrafast; emission properties;

D O I：

10.1143/JJAP.36.1984

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Terahertz (THz) radiation is generated from biased YBa2Cu3O7-delta (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.

引用

页码：1984 / 1989

页数：6

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