Abstract:Optical non-reciprocity refers to the property that the optical field cannot return along the original path after passing through the optical system in one direction, which is the basic principle of optical isolation system design and has important applications in the development of high-performance lasers and quantum precision measurement technology. The traditional method to realize optical non-reciprocity is to use the Faraday magneto-optical effect, but the strong magnetic field it requires cannot meet the near-zero magnetic requirement of atomic inertial measurement instrumentation based on spin-exchange-free relaxation, and it leads to difficulties in integration, which limits the further development of quantum precision measurement technology. Therefore, in order to break the limitation of the traditional Faraday effect, this paper focuses on the non-magnetic optical non-reciprocity technology, introduces the current status of the research on non-magnetic optical non-reciprocity and the latest progress of the non-magnetic non-reciprocity, sums up the characteristics of the methods, and analyzes and looks forward to the future development trend of the non-magnetic optical non-reciprocity.