METHOD OF OBTAINING INTERFERENCE PATTERN IN COHERENT LIGHT Russian patent published in 2015 - IPC G01B9/02 G02B27/50 

FIELD: physics.

SUBSTANCE: in the method, a wave front is divided according to amplitude and phase into a zero diffraction order objective wave front and first diffraction order reference wave front using a diffraction element. The zero diffraction order objective wave front and first diffraction order reference wave front are returned to the plane of the diffraction element. After the diffraction element, the returned zero diffraction order objective wave front propagates towards the first diffraction order reference wave front in reverse direction; the returned first diffraction order reference wave front propagates towards the zero diffraction order objective wave front in reverse direction, and an interference pattern is observed upon superposition of the zero diffraction order objective wave front and first diffraction order reference wave front in reverse direction of said wave fronts.

EFFECT: simple method by obtaining interference patterns of fast processes at one measurement instant.

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