Excitability and Dynamics of a Q-Switched All-Fiber laser with Saturable Absorber Event as iCalendar
05 April 2017
11am - 12pm
Title: Excitability and Dynamics of a Q-Switched All-Fiber laser with Saturable Absorber
Speaker: Robert Otupiri, PhD Candidate, UoA, Department of Physics
Abstract: Recent experimental work has revealed promising applications of laser systems with saturable absorbers for developing novel telecommunication and optical logic schemes. In this project, we characterize the behaviour of such a laser system by using a dynamical systems approach and associated numerical methods. Our primary focus is a model, developed by Yamada, that describes self-pulsing dynamics in lasers lasers with saturable absorbers accurately and in good agreement with experimental findings.
We conduct a bifurcation analysis of an all-bre laser system with emphasis on the relaxation times of both the gain medium and the absorber medium and their influence on the general behaviour of this laser system. In this way, an in-depth guide or map is obtained of how to generate desired output pulse characteristics. Our results show a plethora of complex dynamics exhibited by the laser. Additionally, depending on the ratio of relaxation times of gain and absorber media, we obtain qualitatively different bifurcation diagrams. By carefully tuning the ratio of these relaxation times we can obtain a desired characteristic of the pulsed laser system.