The excess 1/f noise investigations of YBCO films on SrTiO3 substrates are reported.The epitaxial films produced by the laser ablation are characterized by the high perfectstructure, sharp superconducting transition, strong pinning and very low excess 1/f noise.It is observed that the level at normal state depends on the dislocation density. The bestnoise properties are observed for films with the dislocation density of (8-12) disl/Μm2.These films have noise Hooge-parameters of around (1.6-3)×10-6, which is 3 order lessthan published values. The calculation of the bolometer based on investigated films,shows the possibility to reach the noise equivalent power limited by only the phononnoise in the modulating frequency range beginning above 0.1 Hz.@en

The noise characteristics of YBa2Cu3O7-x films prepared by the laser ablation technique on SrTiO3 substrates were studied. The epitaxial YBCO films possess a perfect structure and are characterized by a narrow superconducting transition, strong pinning, and a very small flicker noise. In the normal state, the 1/f noise increases with the dislocation density. The minimum noise level with a Hooge parameter of (2-3) × 10-6 was observed at a disc location density of 8-12 μm-2.@en