A laser probe for measuring a magnetic field is disclosed. A polarized laser beam is passed through a magneto-optic crystal in the presence of an unknown magnetic field. The rotation of the polarization which occurs through the magneto-optic crystal is measured in order to determine the magnitude of...http://www.google.de/patents/US5969517?utm_source=gb-gplus-sharePatent US5969517 - Apparatus for performing quantitative measurement of DC and AC current flow in integrated circuit interconnects by measurement of magnetic fields with a magneto optic laser probe
