Simulation-based calibration-free laser-induced breakdown spectroscopy using gradient optimization

Kurzfassung

We implement a local gradient-based scheme to fit Laser-Induced Breakdown Spectroscopy (LIBS) spectra to the emission of a uniform, isothermal, stationary plasma in local thermal equilibrium. The gradients of the loss function are obtained by automatic differentiation. We demonstrate the self-consistency and robustness of our fitting scheme through systematic analysis of synthetic spectra and find that, for a wide range of plasma parameters, no additional minimum of the loss function was detected within the investigated parameter domain, enabling reliable recovery of the true parameters.