A Numerical Simulation And Preliminary Research Of A Quantum Dot-Doped Fiber Laser

In this thesis for Science Bachelor, we numerically simulate a novelfiber laser --- a quantum dot doped fiber laser (QDFL) on a studying basisof conventional fiber lasers.(1) We begin with a review of the history and the development of fiberlasers in recent years, followed discussion of performance of fiberlasers in Chapter 1.(2) The structure and principle of conventional fiber lasers aredescribed in Chapter 2, especially, focused on a ytterbium doped fiberlaser (YDFL), including the spectrum characteristics of Yb3+ ion, thelasing oscillation of YDFL, the primary structure of a single-clad fiberlaser and double-clad fiber laser, respectively. Followed the YDFL, therate equation for QDFL is established, and the numerical solution isobtained by using a numerical computational method.(3) The type of resonators, pumping source and pumping technology are discussed in details in Chapter 3.(4) Using a numerical method, we calculate the laser power and thesaturated length of a PbSe quantum dot doped fiber laser (PbSe-QDFL)and a CdSe/ZnS quantum dot doped fiber laser (CdSe-QDFL)respectively. Compared the PbSe-QDFL with the CdSe-QDFL, it'sshown that PbSe-QDFL has a lager laser power and higher gain thanCdSe-QDFL, providing a useful reference for developing high-powerQDFL in experiments in the future.(5) Compared the QDFL with the YDFL, numerical results show that,QDFL has a larger laser power and a higher gain with a shortersaturated fiber length. The laser power of the QDFL, depends close onthe fiber length, while the saturated laser power does not depend onthe doped density. The laser power can be increased or decreased bychanging the reflectivity of the resonator.It is the first time for presenting the quantum doped fiber laser to ourknowledge. The data obtained in this thesis are helpful to develop QDFL inthe future.