星载光控高温超导衰减器及其光热效应影响时长

Optically controlled high temperature superconducting attenuatorand the influent duration of laser heat

提出了一种针对星载高温超导系统使用的新型光控高温超导微波可变衰减器。该衰减器的实质是利用高温超导薄膜极低的微波表面电阻和卓越的激光响应特性,实现优良的衰减性能。主要结论包括:高温超导衰减器的插入损耗小于0.2dB,比常规衰减器低1个数量级;当激光波长为0.68μm时,高温超导衰减器的可变衰减精度小于0.01dB,比常规衰减器至少低1～2个数量级;研究了激光热效应的影响时长,当激光功率为45mW时,高温超导微带线的激光响应幅度约0.09dB,空间热效应影响持续时长约3.5s。

A new optically controlled high temperature superconducting microwave variable attenuator used in hightemperature superconducting （HTS） subsystem of satellite system was proposed. The low microwave surface resistance and excellent laser response characteristics of HTS film was used to realize the favorable properties of this attenuator. The main results conclude： Insertion loss of this attenuator is about 0.2dB, which is lower one order than conventional attenuators; Variable precision about 0.01dB can be achieved, which is lower 1-2 order than conventional attenuators. When laser power is about 45mW, the response range of HTS microstrip to laser is about 0.1 dB and the duration of heat influence continue 3.5 s