Figure 2
From: Glass-on-Glass Fabrication of Bottle-Shaped Tunable Microlasers and their Applications
(a–c) Lasing spectra from three of five resonators made on the same 20 μm fibre. The spectra correspond to bottle resonators with diameters of 42 μm (top), 60 μm (middle) and 160 μm (bottom). (d) The excitation of a continuous series of microresonators from thickness variations in a thin coating. Each panel (1–14) is an image of a 20 μm fibre supporting two microbottles, one at the top and one at the bottom of the image. In between these two resonators is a region with a thin coating of doped glass and the tapered fibre (white arrow) is moved along this region, see supplementary file S2. The lasing spectra in (a,b) correspond to the taper positions indicated in panel 1 and 14, respectively.
