Low threshold fiber taper coupled rare earth ion-doped chalcogenide microsphere laser<xref ref-type="fn" rid="cpb141673fn1">*</xref>

Low threshold fiber taper coupled rare earth ion-doped chalcogenide microsphere laser*

Li Chao-Ran^a), Dai Shi-Xun^a)†, Zhang Qing-Yuan^b), Shen Xiang^a), Wang Xun-Si^a), Zhang Pei-Qing^a), Lu Lai-Wei^a), Wu Yue-Hao^a)‡, Lv She-Qin^a)

A typical fluorescence spectrum of the ChG microsphere when the pump power is below the laser threshold. The inset shows a 75-μm diameter ChG microsphere coupled with a fiber taper (1.77-μm waist diameter).