Abstract

Since the discovery of high-Tc superconductors, the feasibility of optical and infrared superconducting detectors has been much investigated as one of the promising electronic applications.^{[1, 2]} In this paper, we have investigated optical response of epitaxial DyBa₂Cu₃O_7-x thin films to a GaAlAs diode laser light at the wavelength of 830 nm in order to use the thin film as a fast photo-detector for our laser frequency system with the accuracy as high as 1 × 10^-10.^[3] We have, for the first time, succeeded in observing the optical response at the modulation frequency up to 100 MHz.

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