Interaction of Microwave Coupled Ferrimagnetic Sphere with Figure-8 Laser

Coupling both optical light and microwave with magnetic materials is a pursued area of research recently as it will lead to emerging quantum technologies. Although spin waves in magnetic materials can be strongly coupled to microwave radiation, effective coupling of optical light with spin wave in magnetic system is still a major challenge. We have set up a figure-8 laser and integrated it with a coupled ferrimagnetic sphere-microwave resonator. We demonstrate the modulation of optical spectrum of figure-8 laser pulse by interaction with the microwave coupled ferrimagnetic YIG sphere. We observe that spectral peaks of optical pulses are governed by cavity modes formed by the YIG element.