The invention relates to a method for monitoring time-dependent properties of light in scanning swept-source optical coherence tomography, comprising the following steps: a. generating laser light with wavelengths that change on a time-dependent basis and with a predefined sweep duration; b. dividing the laser light into sample light, reference light and monitor light; c. guiding the reference light into a reference arm of an OCT interferometer; d. guiding the monitor light into a monitor device that generates at least one optical monitor signal representing at least one time-dependent property of the monitor light; e. generating at least one electric monitor signal from the at least one optical monitor signal with a light detector; f. illuminating a sample with sample light at a specific point, wherein the illumination point is guided on the surface of the sample along a predefined trajectory; g. superimposing the light scattered from the sample with the reference light emitted from the reference arm on a light detector to generate an electric OCT signals; characterised in that h. the at least one electric monitor signal and the electric OCT signal are AD-converted in alternating sequence, in each case equidistantly in time, as a result of which a single digital data stream comprising time segments each with only one of the AD-converted signals is formed.
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