Experimental control of a chaotic semiconductor laser.

Area of Science:

• Nonlinear dynamics
• Semiconductor laser physics
• Optical engineering

Background:

• Semiconductor lasers exhibit complex dynamics, including chaos, when subjected to optical feedback.
• Optical feedback can induce bifurcations, leading to unstable, periodic, chaotic, and coherence collapse states.
• Controlling chaotic laser output is crucial for applications requiring stable light sources.

Purpose of the Study:

• To experimentally control the chaotic output of a single-mode semiconductor laser.
• To stabilize the laser system at maximum intensity using a novel control technique.
• To investigate the effects of optical feedback on laser dynamics.

Main Methods:

• Experimental setup involving a single-mode semiconductor laser near threshold.
• Application of optical feedback with simultaneous adjustment of feedback phase and strength.
• Implementation of the dynamic targeting technique, theoretically proposed by Wieland et al.

Main Results:

• Successfully controlled the chaotic output of the semiconductor laser.
• Steered the laser into a stable maximum gain mode.
• Achieved stabilization of the system at maximum intensity, overcoming chaotic behavior.

Conclusions:

• Dynamic targeting is an effective experimental method for controlling chaotic semiconductor laser output.
• Simultaneous adjustment of feedback phase and strength allows for stabilization of laser dynamics.
• This technique offers a pathway to reliable and stable laser operation in systems prone to chaos.