Circular Polarization Laser Output Through Magnetic Switch

In order to obtain an integrated structure achieving controllable circular polarization and laser output at 1310 nm, the gain and loss microcavities, magnetic microcavity, and metal layers are used to form a compound structure system, and the 4 × 4 transfer matrix is used to study transmission characteristics of the structure. The strong Faraday rotation effect and gain transmission modes are found through external pump energy, which leads to a circular polarization laser output. The output of circular polarization laser can be controlled by the modulation of external magnetic field. The structure can be functioned as a magnetic switch of circular polarization lasing.