Fig. 1. TEM images of PbSe QD-doped bulk glass and fiber fabricated under identical heat-treatment conditions and their normalized particle-size distributions. (a) TEM image of bulk glass; (b) TEM image of fiber; (c) high-resolution TEM image of bulk glass; (d) high-resolution TEM image of fiber; (e) normalized particle-size distribution of PbSe QDs in bulk glass; (f) normalized particle-size distribution of PbSe QDs in fiber

Fig. 2. Absorption spectra of PbSe QD-doped glass and fiber and wavelength-dependent absorption coefficient

Fig. 3. Schematic of energy-level transitions of PbSe QD

Fig. 4. PL spectra of 2 cm long PbSe QD-doped fiber under different pumping powers

Fig. 5. PL peak intensity of PbSe QD-doped fiber versus pumping power

Fig. 6. Attenuation of pumping power within fiber

Fig. 7. PL emission spectra of PbSe QD-doped fiber and bulk glass

Fig. 8. PL peak intensity and peak wavelength of PbSe QD-doped fiber versus PbSe QD-doped fiber length