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Self-mixing speckle interference in DFB lasers.

Daofu Han, Ming Wang, Junping Zhou

|June 12, 2009

Summary

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Self-mixing speckle interference in distributed feedback (DFB) lasers can measure target velocity. This study analyzes dynamic laser output variations and probability density functions, confirming its measurement potential.

Area of Science:

Optics and Photonics
Laser Physics
Metrology

Background:

Self-mixing interference occurs when light from a laser is reflected off a rough surface back into the laser cavity.
Distributed feedback (DFB) lasers are semiconductor lasers with a grating structure that provides wavelength selectivity.
Speckle patterns arise from the interference of coherent light scattered by a rough surface.

Purpose of the Study:

To theoretically analyze and experimentally investigate self-mixing speckle interference in a DFB laser.
To explore the dynamic output variations and probability density functions (PDFs) of a DFB laser under self-mixing conditions.
To determine the feasibility of using DFB laser self-mixing speckle interference for velocity measurements.

Main Methods:

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Theoretical modeling based on speckle theory and self-mixing interference principles.

Numerical simulations to predict laser output behavior.

Experimental setup to generate and measure self-mixing speckle interference in a DFB laser with a moving rough surface.

Main Results:

Observed dynamic output variations in the DFB laser due to self-mixing speckle interference.
Analyzed the probability density functions (PDFs) of these dynamic output variations.
Demonstrated strong agreement between numerical simulations and experimental results.

Conclusions:

Self-mixing speckle interference in DFB lasers is a viable phenomenon for analysis.
The study confirms that DFB laser self-mixing speckle interference can be effectively utilized for target velocity measurement.
This technique offers a novel approach to non-contact velocity sensing.