Аннотация:Combination of laser ablation of a solid sample followed by laser induced fluorescence of the gas phase above the sample was applied for detection of uranium isotopes in a solid sample. The Nd:YAG solid state laser was used for ablation. The tunable diode laser was used for excitation of the resonance frluorescence of free uranium atoms in laser plume. The atomic lines around 682.673 nm were used. The optimal time delay and location of observation zone for obtaining of maximal signal-to-noise ratio was found. The components of U(235) fine stucture of the transition were resolved by fast scanning of the diode laser acros the spectral range 682.60 - 682.69 nm. The detection limit for U(235) of 0.6 mg/g was achieved.