[en] To investigate the possibility of creating bolometers operating at the nitrogen cooling level, bolometric properties of YBa₂Cu₃O_7-x composition films, produced by laser spraying technique, are investigated. Resistance dependence on temperature within 77-100K limits and volt-watt sensitivity and noise stress dependence on frequency are studied. Obtained data analysis has shown the possibility of creating bolometers on high-temperature superconducting films with threshold sensitivity which is by two orders better than in non-cooled bolometers and is close to limitation by background radiation fluctuations

[en] Results of noise investigations of Y-Ba-Cu-O film samples, prepared by laser evaporation are presented. Films of YBa₂Cu₃O_7-x composition of 100-1500 A thickness were sprayed on SrTiO₃ substrates with 1 mm thickness. Frequency dependences of noise in 1.6 Hz - 20 kHz range, current dependences of noise, as well as dependences of noise on temperature and resistance were measured. It is shown that noise growth is observed with increase of resistance in the region of transition from superconducting to normal state at R=(0.2-1) R_N and then, up to resistance, corresponding to room temperature. This phenomenon can be related with increase of the share of normal zones, their structural defects or contacts between grains