Fabrication and characterization of Ge–Ga–Sb–S glass microsphere lasers operating at

Yang Kun¹, Dai Shixun^{1, 2}, Wu Yuehao^{1, 2, †}, Nie Qiuhua^{1, 2, ‡}

(color online) (a) Microscopy image and (b) SEM image of typical 2S2G microspheres fabricated in this work. The green circle in (a) represents the contour of an ideal sphere. (c) Transmission spectra obtained with a 252.45- -diameter microsphere (black curve) and an 80.63- m-diameter microsphere (red curve) when coupled with a 1.83- waist-diameter fiber taper. Red and black arrows in fig. 1(c) point to resonant dips whose Q-factors are higher than 10⁵.