Low‐Threshold Whispering‐Gallery Mode Upconversion Lasing via Simultaneous Six‐Photon Absorption

• DOI: 10.1002/adom.201800407
• Publication Date: 2018-06-26T06:05:54Z
• Authors: Anqi Chen; Hai Zhu; Yanyan Wu; Decheng Yang; Jinyu Li; Siufung Yu; Zhiyang Chen; Yuhao Ren; Xuchun Gui; Shuangpeng Wang; Zikang Tang
• Keywords: Photon Upconversion; Gain-switching; Two-Photon Absorption

Abstract The upconversion lasing through simultaneous multiphoton absorption (MPA) is a high‐order nonlinear optical process, which enables many critical applications in the fluorescence imaging probe, laser tomography, and photodynamic therapy. Herein, from microwires via six‐photon at room temperature first realized. Moreover, peak third‐harmonic generation of pumping light are observed concurrently, while temperature‐dependent spectrum elucidates essential distinction between each other. In addition, low‐threshold excited whispering‐gallery mode based on strong confinement hexagonal microcavity investigated comprehensively. results prove that it feasible to realize MPA using high Q‐factor microcavity, can be promoted other wide bandgap semiconductor micro‐/nanostructure generate frequency lasing.