The microscope has an acousto-optical component (13) positioned in the path of the output beam (7) from an illumination light source (3) and the detection light (31) from the illuminated sample received by a detector (41). The acousto-optical component allows a partial beam extracted from the illumination beam to be fed to a monitoring detector (49), connected in a regulation circuit (51) for regulating the intensity of the illumination light (17).
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