  Fibers lasers is a field which is typically dominated by rare earth ions as
gain material in the core of a silica optical waveguide. Due to their specific
emission wavelengths, rare-earth doped fiber lasers are available only at few
pre-defined wavelengths. However, Quantum Dots (QDs) are materials, which shows
tunable emission with change in size and composition. Due to such tunability,
QDs seem to be promising candidates for obtaining fiber lasers at a spectrum of
wavelengths which are not possible using rare earth ions. To replace rare earth
ions with QDs, it is of paramount importance that QDs show signatures of
optical gain. Here, we report synthesis of asymmetric pod-shaped CdSe/CdS QDs,
which demonstrate efficient gain through pumping. The intrinsic gain properties
of the QDs have been evaluated through Transient Absorption Spectroscopy.
Later, the exquisite QDs are used to fabricate specialty fibers from which ASE
has been obtained by using CW laser pump at Room Temperatur. Finally, Stability
of the emission signal has been by studying photobleaching and controlling the
concentration of the QDs.
