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Emulation of dynamic wavefront disturbances using a deformable mirror.

Ross A Conrad¹, Williams E Wilcox, Timothy H Williams

¹Department of Aeronautics and Astronautics, Massachusetts Institute of Technology,Cambridge, MA 02139, USA . raconrad@gmail.com

|March 5, 2009

Summary

Airborne laser communications face challenges from boundary-layer turbulence. An experimental emulator using a deformable mirror accurately recreates these aero-optical distortions in a lab setting.

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Area of Science:

Optical Engineering
Aerospace Engineering
Physics

Background:

Airborne laser communications (lasercom) are susceptible to atmospheric turbulence.
Uneven airflow around aircraft window interfaces causes boundary-layer turbulence.
This turbulence leads to focal plane distortions, including jitter and beam break-up, hindering tracking and communication.

Purpose of the Study:

To develop and demonstrate an experimental emulator for aircraft boundary-layer turbulence.
To replicate aero-optical distortions in a controlled laboratory environment.
To investigate the impact of these distortions on lasercom links.

Main Methods:

Utilized a deformable mirror to simulate aircraft aero-optical distortions.
Integrated the boundary-layer emulator into a hardware testbed.
Mimicked air-to-space lasercom links under controlled laboratory conditions.
Operated the emulator in the 1.55-micrometer wavelength band.

Main Results:

Successfully demonstrated an experimental emulator for boundary-layer turbulence.
Accurately recreated aero-optical distortions at a rate of 2 kilo-frames per second.
Provided a controlled environment to study lasercom performance under realistic distortion conditions.

Conclusions:

The developed boundary-layer emulator effectively reproduces critical aero-optical distortions.
This testbed enables robust experimental validation of lasercom systems facing airborne turbulence.
The emulator facilitates advancements in lasercom technology for aerospace applications.