METHOD FOR SINGLE-FRAME REGISTRATION OF SEVERAL SPECTRAL DIGITAL HOLOGRAPHIC IMAGES Russian patent published in 2021 - IPC G03H1/02 

FIELD: optical digital holography.

SUBSTANCE: invention relates to optical digital holography technologies and is intended for recording spectral digital holographic images. The method for recording phase images of micro-objects in arbitrary narrow spectral intervals consists in the formation of a collimated light beam of broadband radiation, the isolation of a set of several wavelengths from it using an acousto-optic polychromator filter, the direction of filtered radiation to the input of a two-beam interferometer, in one of the channels of which the object under study is located, the reduction of wave fronts from the object and reference arms of the interferometer, the registration of interference of these fronts by a monochrome matrix radiation receiver. In this case, the integral intensities of the transmission windows of the acousto-optic filter and their frequency positions are selected so that the Fourier images of interferograms formed by radiation from different spectral transmission windows are close in intensity and spaced by position in the Fourier plane so that they can be isolated separately. By digitally processing each of them, the spatial distribution of the phase delay introduced by the object under study is calculated, and, as a consequence, the spectral dependence of this value at each point of the object.

EFFECT: increased speed of data collection and reduced error of restoring the amplitude-phase structure of the studied objects due to the joint processing of several spectral holograms.

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