Preparation of Whispering Gallery Mode Peanut-shaped Cavity and Its Directional Emission Characteristics

Abstract The deformed whispering gallery mode (WGM) microcavity combines the advantages of high quality fac tor and rich internal mode paths demonstrating significant research value in chaotic dynamics sensing detection and directional emission.This paper presents a hybrid fabrication method combining traditional hydrogen-oxygen flame heating and carbon dioxide laser heating.Initially two optical fibers were fused and stretched together using hydrogen-oxygen flame heating.Subsequently secondary fusion stretching was performed through CO laser heating to fabricate a peanut-shaped WGM microcavity array.Experimentally we investigated the effects of stretching dis tance during flame heating and the spacing between two CO laser heating positions on the dimensions and morpholo gy of the peanut-shaped cavities.Using a tapered fiber coupling we explored coupling intensities at different angles and confirmed their directional emission characteristics.Furthermore experiments were conducted using fibers of