Adaptive optics concepts and systems for multipurpose applications at near horizontal line of sight: developments and results

Several studies on different adaptive optics concepts are presented in the article. Each one of the procedures shows its peculiar advantages when considering different situations where the image distortion, due to atmospheric or artificial turbulence, becomes problematic. A setup is presented based on the usual wavefront reconstruction techniques using a Shack-Hartmann wavefront sensor in a closed loop with a deformable mirror and a computer. The reconstruction method follows the modal approach which has been demonstrated to be more robust and suitable than the zonal one when limited to the correction of the first Zernike components1 . Some results deriving from the studies are reported. A second part in the article describes the measurements and the characteristics of the atmospheric turbulence present in direct tests. Another procedure based on the control of a deformable mirror by mean of a fast iterative procedure is also treated and the relative results about the c ompensation of laser beams as well as extended images are shown

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“…The setup has seen several modification during the research 3,7,8 . The recent setup can be seen in figure 1.…”

Section: Description Of the Setupmentioning

confidence: 99%

“…We tried then to understand better the spatial frequency properties of the atmospheric scintillation. A first analysis can be found in 8 . The hope is that the scintillation presents some preferential frequency which can be exploited to stabilize the intensity on the lenslets.…”

Section: Atmospheric Measurements and Test Of Scintillation Robustnessmentioning

confidence: 99%

Adaptive optics solutions for turbulence mitigation in different scenarios

Marchi

Scheifling

2011

SPIE Proceedings

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“…In [44,45], the authors describe a vision system that uses a conventional adaptive optical system and works on the 2.5 km horizontal atmospheric path. Another vision system with adaptive optics included, produced in the Fraunhofer Institute [46,47], was developed to run in urban conditions.…”

Section: Introductionmentioning

confidence: 99%

Wide-aperture multichannel Shack-Hartmann sensor for multispectral wavefront measurements

Galaktionov,

Nikitin,

Sheldakova

et al. 2024

Laser Resonators, Microresonators, and Beam Control XXVI

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A multispectral wavefront sensor can be used to perform a single-shot spatio-temporal characterization of a laser pulse. In order to measure the spatio-spectral electric field, a laser pulse can be spectrally modulated, separated and measured by a wavefront sensor. In order to simplify the experimental setup and hardware control, the single wavefront sensor can be used. In this research we discuss the development of the multi-channel wide-aperture high-resolution Shack-Hartmann sensor for multispectral wavefront sensing. The whole sensor area of 15×15 mm was divided into 4 logical apertures, each for separate laser beam. The development and calibration procedure are described. The wavefront sensor control software is developed and tested.

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“…In [43,44], the authors describe a vision system that uses a conventional adaptive optical system and works on the 2.5 km horizontal atmospheric path. Another vision system with adaptive optics included, produced in the Fraunhofer Institute [45,46], was developed to run in urban conditions.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Turbulence with Kolmogorov Spectra: Software Simulation, Real-Time Reconstruction and Compensation by Means of Adaptive Optical System with Bimorph and Stacked-Actuator Deformable Mirrors

Galaktionov,

Sheldakova,

Samarkin

et al. 2023

Photonics

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Atmospheric turbulence causes refractive index fluctuations, which in turn introduce extra distortions to the wavefront of the propagated radiation. It ultimately degrades telescope resolution (in imaging applications) and reduces radiation power density (in focusing applications). One of the possible ways of researching the impact of turbulence is to numerically simulate the spectrum of refractive index fluctuations, to reproduce it using a wavefront corrector and to measure the resultant wavefront using, for example, a Shack–Hartmann sensor. In this paper, we developed turbulence simulator software that generates phase screens with Kolmogorov spectra. We reconstructed the generated set of phase screens using a stacked-actuator deformable mirror and then compensated for the introduced wavefront distortions using a bimorph deformable mirror. The residual amplitude of the wavefront reconstructed by the 19-channel stacked-actuator mirror was 0.26 λ, while the residual amplitude of the wavefront compensated for by the 32-channel bimorph mirror was 0.08 λ.

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Adaptive optics concepts and systems for multipurpose applications at near horizontal line of sight: developments and results

Cited by 4 publications

References 3 publications

Adaptive optics solutions for turbulence mitigation in different scenarios

Adaptive optics solutions for turbulence mitigation in different scenarios

Wide-aperture multichannel Shack-Hartmann sensor for multispectral wavefront measurements

Atmospheric Turbulence with Kolmogorov Spectra: Software Simulation, Real-Time Reconstruction and Compensation by Means of Adaptive Optical System with Bimorph and Stacked-Actuator Deformable Mirrors

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