PARAMETRIC RESONANCE IN SUPERCONDUCTING MICRON-SCALE WAVE-GUIDES

A parametric resonance due to temperature oscillations in superconduct ing micron-scale waveguides is considered. Oscillations of superconduc tor temperature are assumed to be induced by the irradiation of the wa veguide with a laser beam. The laser power and parameters of the waveg uide providing a possibility of parametric excitation have been calcul ated. It is shown that for a waveguide made of a YBa2Cu3O7 microstrip With resonant frequency of 10 GHz a laser with a power of about 70 W/c m(2) is needed to excite oscillations. The effect can be used for the creation of high-sensitivity tuneable filters and optoelectric transfo rmers on superconducting microstrips in the GHz range. (C) 1997 Americ an Institute of Physics.