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Ranging and velocimetry signal generation in a backscatter-modulated laser diode.

P J de Groot, G M Gallatin, S H Macomber

|June 12, 2010

Summary

A new laser radar uses feedback for precise ranging and velocimetry. Its unique sawtooth waveform arises from a three-mirror Fabry-Perot cavity model.

Area of Science:

Optics and Photonics
Laser Technology
Metrology

Background:

Laser radar (LIDAR) systems are crucial for remote sensing.
Coherent ranging and velocimetry require precise signal generation.
Existing methods may lack compactness or self-alignment capabilities.

Purpose of the Study:

To develop a compact, self-aligning laser radar.
To investigate beat-signal generation for ranging and velocimetry.
To model the asymmetric modulation waveform observed.

Main Methods:

Construction of a self-aligning laser radar using a modulated laser diode.
Utilizing feedback from light scattered by a diffusing target.
Experimental and theoretical analysis of beat-signal generation phenomenology.

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Development of a theoretical model based on a three-mirror Fabry-Perot cavity.

Main Results:

Successful construction of a compact, self-aligning laser radar.
Observation of an asymmetric, sawtooth-like ac-coupled modulation waveform.
Demonstration that the waveform differs for the two light propagation directions.
A theoretical model accurately describes signal generation and waveform asymmetry.

Conclusions:

The developed laser radar is effective for coherent ranging and velocimetry.
The asymmetric waveform is a key characteristic explained by the Fabry-Perot cavity model.
This work advances understanding of laser radar signal generation for metrology applications.