From Event: SPIE Optical Engineering + Applications, 2017
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.
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 (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 6 September 2017); https://doi.org/10.1117/12.2270495.
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