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Target-in-the-loop wavefront sensing and control with a Collett-Wolf beacon: speckle-average phase conjugation.

Mikhail A Vorontsov¹, Valeriy V Kolosov, Ernst Polnau

¹Intelligent Optics Laboratory, Computational and Information Sciences Directorate, U.S. Army Research Laboratory, Adelphi, Maryland 20783, USA. mvorontsov@arl.army.mil

|December 25, 2008

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A new adaptive optics technique uses speckle-average phase conjugation to improve laser projection onto distant targets. This method enhances power density by compensating for atmospheric turbulence and speckle effects.

Area of Science:

Optical Engineering
Laser Physics
Wavefront Sensing

Background:

Adaptive optical systems are crucial for laser beam projection through turbulent media.
Speckle effects from target surfaces degrade beam quality and power density.
Conventional methods struggle with extended targets in inhomogeneous environments.

Purpose of the Study:

To introduce and evaluate a novel adaptive optics wavefront control technique: speckle-average (SA) phase conjugation.
To mitigate speckle effects and compensate for atmospheric turbulence in laser projection.
To analyze the performance of SA phase conjugation with varying target anisoplanatism and beacon size.

Main Methods:

Developed and implemented speckle-average (SA) phase conjugation for wavefront control.

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Utilized a Shack-Hartmann wavefront sensor to measure target return wave slopes.

Generated an incoherent Collett-Wolf beacon on the target using a scanned auxiliary laser beam.

Conducted numerical simulations and experimental validation.

Main Results:

SA phase conjugation effectively mitigates speckle effects from rough target surfaces.
The technique demonstrates efficient compensation for atmospheric turbulence.
Significant increase in projected laser beam power density on remote extended targets was observed.
Performance is influenced by target anisoplanatism and Collett-Wolf beacon characteristics.

Conclusions:

Speckle-average phase conjugation offers a robust solution for adaptive optics in challenging environments.
The method enhances laser projection efficiency and power delivery to extended targets.
Further research can optimize system performance by considering beacon size and target properties.