FIELD: optical microscopy. SUBSTANCE: invention is used in optical microscopy to measure phase difference with accuracy of the order of 10-3-10-4 rad. Splitter of illuminating wave and frequency shifter of interferometer are manufactured in the form of optical integrated circuit on single-mode strip waveguides with fibre-optical butt input. Given integral circuit incorporates waveguide input splitter for two waveguides leading to free butt of integral circuit with open ends and phase modulator positioned on these waveguides (or on one of them). EFFECT: increased accuracy of interferometer. 1 dwg
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