Statistical distribution of frequency fluctuations in semiconductor lasers

Area of Science:

• Physics
• Optical Engineering
• Laser Technology

Background:

• Semiconductor lasers are crucial in modern optics.
• Their frequency fluctuations are typically modeled as Gaussian.
• External optical feedback can significantly alter laser dynamics.

Purpose of the Study:

• To investigate the statistical properties of frequency fluctuations in semiconductor lasers under optical feedback.
• To determine if these fluctuations deviate from Gaussian statistics.
• To analyze the extent of this deviation under various operational parameters.

Main Methods:

• Experimental setup utilizing a single-mode semiconductor laser.
• Introduction of controlled external optical feedback.
• Measurement and statistical analysis of instantaneous emission frequency fluctuations.

Main Results:

• Observed a significant departure from Gaussian statistics in frequency fluctuations.
• Quantified the degree of this departure.
• Demonstrated that the deviation varies with operating conditions.

Conclusions:

• The standard Gaussian model is insufficient for describing frequency fluctuations in semiconductor lasers with optical feedback.
• External optical feedback induces non-Gaussian behavior.
• Further research is needed to develop more accurate models for laser frequency noise.