Restoration of the intensity profile of a focused laser spot by means of combining optical correlation with a numerical method.
A method is presented by which intensity profile of a focused light spot is reconstructed from the correlation pattern between itself and a pinhole, which is obtained by moving the focused spot with the aid of an acousto-optic deflector (AOD). The pattern was formulated into a matrix equation by assuming that it was circular symmetric and was approximated by a number of linear functions. The results were numerically given by solving the matrix equation with a modified least-squares method and were assessed for the degree of focus, influence of signal fluctuations, and degradation of the spot resulting from heat generation within the AOD.
Saiga
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