Implementation of Magneto-Optic Probe with > 10 GHz Bandwidth

Abstract

Magneto-optic probes with bandwidths of > 10 GHz were implemented for the first time. Rotation magnetization in a Bi-substituted rare-earth iron garnet crystal is utilized as a fast magnetization phenomenon for magnetic field sensing through the sensitive fiber-optic Faraday effect detection system with the magneto-optic crystal attached onto its fiber facet. Its minimum detectable current is around 140 µA rms. A method to further extend the bandwidth by introduction of elastic strain was discussed while successful demonstration of two-dimensional magnetic field mapping was performed over a GHz-band microstrip line circuit.