Magnetfeldsonde

A magneto-optical probe is comprised of a composite magneto-optical solid medium subjected to a variable magnetic field and constituted by a plurality of plane parallel contiguous component parts and through which an elliptically polarized light beam of adjustable eccentricity and inclination is passed for multiple reflection within the medium. After issuing from the medium, the beam which is now again substantially linearly polarized and inclined by an amount proportional to the magnetic field is passed through an optical divider and the two parts of the beam are passed respectively through analyzers which produce two phase-shifted linearly polarized light signals that are then passed to photo-detectors which convert the light signals into corresponding electric signals for further electronic processing.