Figure 8.

(a) Lower and (b) higher magnification SEM images of Bi₂Te₃ samples. (c) The device of passive Q-switched Ho³⁺-doped fiber laser based on the TI: Bi₂Te₃SA [210]. Copyright 2015 The Optical Society. (d) Morphology of Sb₂Te₃ layers under atomic force microscope. The central wavelength of the emitted solitary light is 1558.6 nm. (e) Spectrum with indication of 3 dB bandwidth. Illustration: spectral record of the 30 nm span, (f) 1.8 ps pulse Autocorrelation [225]. Copyright 2014 American Institute of Physics. (g) Dispersion curve of the fluortellurate glass fiber, inset: photo of the end face of the fluortellurate glass fiber. (h) Loss curve of fluortellurate glass fiber. (i) Evolution trend of supercontinuum laser output spectrum with pumping laser power. (j) Curve of output power of supercontinuum laser with pump laser power [236]. Copyright 2018 OSA Publishing.