E-catalog        

A feature of the propagation of high power femtosecond laser radiation in the atmosphere is self-focusing with further filamentation, which leads to the formation of plasma at some distance from the laser system. In the problem of sensing by femtosecond laser radiation, these features make it possible to implement the method of remote identification of an impurity substance contained in the form of a droplet or solid aerosol, and determination of its concentration, known in foreign literature as R-FS-LIBS (Remote Femtosecond Laser Induced Breakdown Spectroscopy) [1, 2, 3]. Work on controlling the position of the filamentation zone is carried out both abroad [4] and in Russia [5, 6]. The report presents the results of evaluating the angular distribution of emission from the breakdown region of the aerosol atmosphere by femtosecond pulses in the range from 6 to 180о and the intensity of the emission line depending on the concentration of impurity for the problem of remote sensing by the method of laser induced breakdown.