Laser beam propagation and wavefront correction in turbid media

Galaktionov, Ilya; Kudryashov, Alexis; Sheldakova, Julia; Byalko, Alexander; Borsoni, G.

doi:10.1117/12.2195734

Cited by 8 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is quite simple to operate and can be easily calibrated for proper use [59]. Shack-Hartmann sensor is widely used in a large and diverse sets of applications, primarily to measure distortions of the wavefront of the radiation passing through different media, i.e., turbulent or scattering atmosphere [60], biological tissues [61], etc. To describe and visualize the wavefront surface analytically, one can use the polynomial approximation, for example, B-Splines [62] or Zernike polynomials [63][64][65][66], which are commonly used in optics.…”

Section: Maximum Input Voltage −30…+130 V −200…+300 Vmentioning

confidence: 99%

Atmospheric turbulence generator: software and hardware implementation of Kolmogorov phase screen simulation system

Galaktionov,

Sheldakova,

Toporovsky

et al. 2024

Laser Resonators, Microresonators, and Beam Control XXVI

Self Cite

View full text Add to dashboard Cite

Atmospheric turbulence causes refractive index fluctuations that introduce extra distortions to the wavefront of the propagated radiation. It degrades the resolution of the telescope for imaging applications and reduces the radiation power density in focusing applications. One of the possible ways of research the impact of the 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 a Shack-Hartmann sensor. In this paper, we developed turbulence simulator software that generates the sequence of phase screens with Kolmogorov spectra. We reconstructed the generated set of phase screens using a stacked-actuator deformable mirror.

show abstract

Section: Maximum Input Voltage −30…+130 V −200…+300 Vmentioning

confidence: 99%

Atmospheric turbulence generator: software and hardware implementation of Kolmogorov phase screen simulation system

Galaktionov,

Sheldakova,

Toporovsky

et al. 2024

Laser Resonators, Microresonators, and Beam Control XXVI

Self Cite

View full text Add to dashboard Cite

show abstract

“…In a conventional Shack-Hartmann technique [54][55][56][57][58][59][60][61][62], the wavefront of the incident radiation is divided into a number of sub-apertures by means of lenslet array. Lenslet array is a thin, flat base with a grid of micro lenses (lenslets) etched on the base.…”

Section: Conventional Shack-hartmann Wavefront Sensormentioning

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

View full text Add to dashboard Cite

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.

show abstract

Section: Shack-hartmann Wavefront Sensormentioning

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Laser beam propagation and wavefront correction in turbid media

Cited by 8 publications

References 18 publications

Atmospheric turbulence generator: software and hardware implementation of Kolmogorov phase screen simulation system

Atmospheric turbulence generator: software and hardware implementation of Kolmogorov phase screen simulation system

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

Contact Info

Product

Resources

About