Two-Zone Model of Laser-Induced Plasma

An algorithm modeling a plasma in two-zone source approximation and its interface with the NLopt library for multiparameter optimization were established. In order to allow the spectrum modeling algorithm and the NLopt library to work together an abstraction layer that initializes both libraries in one action, calculates a given type of loss function, and transfers its value to the optimization algorithm is used. The joint use of these algorithms was tested on model data; convergence to the plasma parameters used to obtain the synthetic test spectrum was achieved. It was shown that the two-zone model can be used to describe both ionic and atomic lines correctly, including those that undergo self-reversal during evaporation of the aluminum alloys, while methods of "blind" optimization of the loss function can be used to estimate the temperature and electron density in the laser-induced plasma from its spectra.