Expansion of the Laser Beam Wavefront in Terms of Zernike Polynomials in the Problem of Turbulence Testing

Rukosuev, Alexey; Nikitin, Alexander; Belousov, Vadim; Sheldakova, Julia; Toporovsky, Vladimir; Kudryashov, Alexis

doi:10.3390/app112412112

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…Table 1 shows the key parameters of the simulation. The incident wavefront was derived from the first 15 Zernike polynomials (excluding piston and tilt), because the first 15 Zernike polynomials are sufficient for general wavefront sensing problems [ 50 ]. In addition, the Zernike coefficients were obtained from the randomly weighted Karhunen–Loève [ 51 ] atmospheric turbulence model.…”

Section: Resultsmentioning

confidence: 99%

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration

Yang

Wang

2022

Sensors

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With the successful application of the Shack–Hartmann wavefront sensor in measuring aberrations of the human eye, researchers found that, when the aberration is large, the local wavefront distortion is large, and it causes the spot corresponding to the sub-aperture of the microlens to shift out of the corresponding range of the sub-aperture. However, the traditional wavefront reconstruction algorithm searches for the spot within the corresponding range of the sub-aperture of the microlens and reconstructs the wavefront according to the calculated centroid, which leads to wavefront reconstruction errors. To solve the problem of the small dynamic range of the Shack–Hartmann wavefront sensor, this paper proposes a wavefront reconstruction algorithm based on the autocorrelation method and a neural network. The autocorrelation centroid extraction method was used to calculate the centroid in the entire spot map in order to obtain a centroid map and to reconstruct the wavefront by matching the centroid with the microlens array through the neural network. This method breaks the limitation of the sub-aperture of the microlens. The experimental results show that the algorithm improves the dynamic range of the first 15 terms of the Zernike aberration reconstruction to varying degrees, ranging from 62.86% to 183.87%.

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Section: Resultsmentioning

confidence: 99%

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration

Yang

Wang

2022

Sensors

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“…This parameter, in addition to the frequency of the first resonance [34] , will also determine the speed of control of the adaptive optical system. Meanwhile, considering obtained capacitance of the piezoelements (up to 3.5 nF) such elements could be used in high-speed adaptive optical systems [8,51,52] .…”

Section: Piezoceramic Cartridges Manufacturing and Stroke Measurementmentioning

confidence: 99%

“…To manipulate the properties of the laser beam (intensity distribution, focusability, phase distortions compensation) a lot of techniques could be used: hardware (like focusators [1] , shapers [2,3] , adaptive optics methods [4][5][6][7][8] ), software (luckyimaging [9][10][11] , global processing [12] ) or using both techniques (for example, phase diversity [13,14] ). Main goal of using such devices or methods is mitigate undesirable effects on the laser beam propagated over distance.…”

Section: Introductionmentioning

confidence: 99%

Cartridge-type piezostack deformable mirror with reduced cross-section of control elements

Toporovsky,

Galaktionov,

Samarkin

et al. 2023

Laser Beam Shaping XXIII

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The reduction of cross-sectional area of actuators from 4*4 mm2 to 2*2 mm2 in cartridge-type piezostack deformable mirror was investigated. Harmonic analysis showed that stroke of the actuators with 16 mm2 and 4 mm2 was equal 5.33 and 5.52 microns correspondingly in case of interdigital commutation of layers. However, the mechanical stiffness of such actuators was low. To increase robustness of wavefront corrector a gap structure for inner electrode configuration was used. The piezoceramic cartridges with cross-sectional area of individual actuator with 2*2 mm2 was produced. The local stroke of single piezostack was 4.6-4.8 microns per 300 V.

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“…This parameter, in addition to the frequency of the first resonance [49] , will also determine the speed of control of the adaptive optical system. Meanwhile, considering obtained capacitance of the piezoelements (up to 3.5 nF) such elements could be used in high-speed adaptive optical systems [50][51][52] .…”

Section: Piezoceramic Combs Manufacturing and Stroke Measurementmentioning

confidence: 99%

Stroke simulation of control elements in cartridge-type deformable mirror for correction of aberrations of laser radiation passed through turbulent medium

Toporovsky,

Kudryashov,

Samarkin

et al. 2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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Necessity of miniaturize and to create reliable components for wavefront correctors leads to reduction of the cross-section of the control elements in deformable mirrors. Moreover, such elements should provide reasonable stroke to compensate for wavefront aberrations of the laser radiation propagated through turbulent atmosphere. In this work we simulated the possibility of reducing the cross-sectional area of piezoactuators from 16 mm2 to 5 mm2 in order to hold up the local stroke as 5 microns in the cartridge-type deformable mirror for correction of large- and small-scale phase fluctuations of laser radiation. To increase the reliability of deformable mirror design, the gap structure was used for wiring of electrodes instead of interdigitated commutation.

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Expansion of the Laser Beam Wavefront in Terms of Zernike Polynomials in the Problem of Turbulence Testing

Cited by 12 publications

References 18 publications

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration

Cartridge-type piezostack deformable mirror with reduced cross-section of control elements

Stroke simulation of control elements in cartridge-type deformable mirror for correction of aberrations of laser radiation passed through turbulent medium

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