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Interferometric analysis of absorbing objects

The interference method for reconstruction of the three-dimensional function of an absorption coefficient is presented in this report. The method is based on the use of the nonlinear dependence effect of the refractive index of various media on laser radiation intensity. Powerful laser radiation changes refractive index of specially chosen media to a great extent. These changes can be read out by an interferometer with the aid of probing radiation at any convenient wavelength. The change of the original power density distribution of the radiation under study will cause the change of a form and quantity of fringes. An absorbing (partially diffusing or reflecting) object, introduced into the studied beam, will by no means cause the same changes. Therefore, the change of the form and quantity of the fringes will contain information about an object introduced into radiation.