YBCO高温超导微带线的非平衡光响应及其恢复时长

研究了在波长为0.68μm的连续激光辐照下,钇钡铜氧(YBCO)高温超导(HTS)微带线的非平衡光响应特性,并从超导体机制探索和光响应超导器件研制两个角度对实验现象进行讨论。实验观察到高温超导微带线的非平衡光响应阈值,当功率小于15 mW时,以辐射热效应为主;当功率大于15 mW时,出现非平衡光响应。该阈值的发现,是对Zeldov的“热效应”与“光子效应”同时存在理论的进一步完善,并设想了一种新型的高温超导衰减器;研究了高温超导微带线非平衡光响应的恢复时长,当激光功率为45 mW时,恢复时长约为3.5 s,分析了该时长存在的机制及其对光响应超导器件二次激光激励的影响。

Nonequilibrium Optical Response and Recover Time of High Temperature Superconductor Microstrip

The nonequilibrium optical response of YBa2Cu3O7-δ high temperature superconductor (HTS) microstrip under the illumination of continuous laser with wavelength of 0.68 μm is studied and the experimental phenomena are discussed from two directions, namely the research of HTS mechanism and HTS device based on photo response. The laser power threshold of nonequilibrium optical response in superconductor microstrip is observed, for instance, the thermal response is dominating when laser power is lower than 15 mW, and the nonequilibrium optical response occurs when power is larger than 15 mW. Based on the discovery of this laser power threshold, the theory of Zeldov is supplemented, as well as the design of superconductor device based on photo response is influenced, in addition, a new HTS attenuator is proposed. The recover time of nonequilibrium optical response in HTS microstrip is 3.5 s when laser power is 45 mW, and the existent mechanism of this recover time and influence to the second laser illumination of HTS photo device are analyzed.