Interferometric diagnostics of ablation craters formed by femtosecond laser pulses

摘要

It is proposed to use methods of interferometry for quantitative analysis of the removal of material from the surface of a solid under the action of femtosecond laser pulses (laser ablation craters). The characteristics of the two-dimensional discrete nonlinear Kalman filter for noise-resistant recovery of the deconvolved phase of the pattern of interference fringes characterizing the ablation craters. We present the results of a processing of the two-dimensional interferograms obtained in reflection of light from gallium arsenide and zinc surfaces before and after a high-power femtosecond laser pulse acted on them. The experiment results confirm the high noise resistance of the proposed method of recovering the phase of the two-dimensional interference fringes.