Impact of beacon wavelength on phase-compensation performance

Allison A. Enterline; Mark F. Spencer; Derek J. Burrell; Terry J. Brennan

doi:10.1117/12.2270495

6 September 2017 Impact of beacon wavelength on phase-compensation performance

Allison A. Enterline, Mark F. Spencer, Derek J. Burrell, Terry J. Brennan

Proceedings Volume 10410, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2017; 1041002 (2017) https://doi.org/10.1117/12.2270495
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

This study evaluates the effects of beacon-wavelength mismatch on phase-compensation performance. In general, beacon-wavelength mismatch occurs at the system level because the beacon-illuminator laser (BIL) and high-energy laser (HEL) are often at different wavelengths. Such is the case, for example, when using an aperture sharing element to isolate the beam-control sensor suite from the blinding nature of the HEL. With that said, this study uses the WavePlex Toolbox in MATLAB® to model ideal spherical wave propagation through various atmospheric-turbulence conditions. To quantify phase-compensation performance, we also model a nominal adaptive-optics (AO) system. We achieve correction from a Shack-Hartmann wavefront sensor and continuous-face-sheet deformable mirror using a least-squares phase reconstruction algorithm in the Fried geometry and a leaky integrator control law. To this end, we plot the power in the bucket metric as a function of BIL-HEL wavelength difference. Our initial results show that positive BIL-HEL wavelength differences achieve better phase compensation performance compared to negative BIL-HEL wavelength differences (i.e., red BILs outperform blue BILs). This outcome is consistent with past results.

Conference Presentation

Citation Download Citation

Allison A. Enterline, Mark F. Spencer, Derek J. Burrell, and Terry J. Brennan "Impact of beacon wavelength on phase-compensation performance", Proc. SPIE 10410, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2017, 1041002 (6 September 2017); https://doi.org/10.1117/12.2270495

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