Threshold Reduction for a Diode Laser by using the Technique of Optical Feedback

Abstract

In this experimental work, the dynamics of a distributed feedback
semiconductor laser was studied. Dynamics in free running for a solitary
laser was satisfied experimentally, and then dynamics in the present of
optical feedback, via a free space as a waveguide, was studied
experimentally. Results showed that the insertion of strong level of
optical feedback led the laser emission to be instable due to a bifurcation.

The higher feedback level make the laser operating in the so called
coherence collapse, which means that the dominant operating mode, and
any modulated modes within this range could be translated securely
inside a controlled chaos.