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Angle scintillations in the laser return from a retroreflector.

J P Hansen, S Madhu

|January 30, 2010

Summary

Laser return angle scintillations were observed to be eight times greater than expected due to atmospheric turbulence. This study presents experimental findings and theoretical analysis of this laser beam scintillation phenomenon.

Area of Science:

Optics
Atmospheric Physics
Laser Technology

Background:

Atmospheric turbulence significantly affects laser beam propagation.
Retroreflector systems are sensitive to environmental conditions impacting laser return signals.

Purpose of the Study:

To investigate and quantify angle scintillations in laser return signals exceeding expected atmospheric turbulence effects.
To develop a theoretical model explaining the observed enhanced scintillation.

Main Methods:

Experimental setup using a pulsed 1.06-micrometer laser and a corner cube retroreflector.
Measurement of angular scintillations of the laser return.
Comparison with a reference beacon to quantify scintillation magnitude.

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Main Results:

Observed angular scintillations eight times greater than a reference beacon.
Experimental data indicates scintillation exceeding predictions based solely on atmospheric turbulence.
A theoretical analysis was performed to understand the underlying mechanism.

Conclusions:

Atmospheric turbulence alone does not fully explain the observed laser return angle scintillations.
Phase fluctuations in the illuminating laser beam are proposed as a significant contributing factor.
A derived expression relates scintillation angle to phase fluctuation parameters.