PHASE-INTERFERENCE MODULE Russian patent published in 2015 - IPC G02B21/00 

FIELD: physics, optics.

SUBSTANCE: invention relates to microscopy and can be used in biology, medicine and optical instrument-making. The phase-interference module comprises a microscope for forming an enlarged image of a microscopic object in the back focal plane of said microscope, a 4f optical system consisting of two Fourier lenses, the front focal plane of which coincides with the back focal plane of the microscope. An output image recorder is placed in the back focal plane of the 4f optical system. A beam splitter is placed inside the 4f optical system before the common focal plane. A phase spatial Zernike filter is placed in the common focal plane of the 4f optical system, said filter operating on reflection and being in the form of a flat mirror which consists of a fixed flat mirror component with a narrow opening at the centre and a movable flat mirror component placed in said opening while allowing displacement in the direction of the normal to the surface of the fixed component. The centre of the movable flat mirror component coincides with the optical axis of the 4f optical system.

EFFECT: engineering problem solved by the present invention is reducing phase distortions, improving linearity of phase shift and improving measurement accuracy.

2 cl, 1 dwg