Abstract
We demonstrate the generation of Q-switched pulses from an
ytterbium-doped fiber laser (YDFL) using quantum dot (QD) CdSe as a
passive saturable absorber (SA). The CdSe QD is fabricated by the
synthesis of CdO, Se, and manganese acetate and paraffin oil and oleic
acid as the solvent and surfactant, respectively. The CdSe QD is then
doped into poly-methyl-methacrylate (PMMA) via an emulsion polymerization
process. A PMMA-hosted CdSe QD thin flake with a homogeneous end surface
is then formed and placed between two ferrules and assembled in a YDFL
cavity to achieve the Q-switching operation with a repetition rate of
24.45 to 40.50 kHz while varying the pump power from 975 to 1196 mW. The
pulse width changes from 6.78 to 3.65 μs with a maximum calculated pulse
energy at 0.77 μJ at a pump power of 1101 mW. This work may be the first
demonstration of CdSe QD-based Q-switching in an all-fiber configuration
that should give proportional insight into semiconductor QD materials in
photonics applications.
© 2016 Chinese Laser Press
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