Extraction of Microwave Pulses from a Cavity Using a Y-Ba-Cu-O Superconducting Film Switch
Abstract
A microwave pulse source utilizing a Y-Ba-Cu-O (YBCO) superconducting film switch was studied. A YBCO thin film with Tc as high as 86 K was fabricated by a laser ablation technique. It was installed in a cylindrical TE111 mode cavity made of copper with a resonant frequency of 2.84 GHz. The cavity was evacuated and immersed in liquid nitrogen. The switching from superconducting to normal states in the YBCO film was made using a 1.06-μm pulsed Q-switched Nd:YAG laser with a half-time-width of 10 ns. Microwave pulses were extracted from the cavity by the YBCO film switch with a rise time of 30 ns. A microwave pulse peak power of about 3.4 μW was obtained for the 0.2 μm film at 79 K and at an incident laser energy of 3.6 mJ. The peak power gain of the output pulse was calculated theoretically. The experimental results were found to agree with the calculated ones qualitatively.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- January 1992
- DOI:
- 10.1143/JJAP.31.123
- Bibcode:
- 1992JaJAP..31..123T
- Keywords:
-
- Cavity Resonators;
- Electromagnetic Pulses;
- High Temperature Superconductors;
- Microwave Switching;
- Q Switched Lasers;
- Superconducting Films;
- Yttrium Oxides;
- Barium Oxides;
- Copper Oxides;
- Laser Outputs;
- Neodymium Lasers;
- Pulsed Radiation;
- Thin Films;
- Yag Lasers;
- Electronics and Electrical Engineering