Adaptive optics system for real-time wavefront correction

Rukosuev, Alexey; Kudryashov, Alexis; Lylova, Anna; Samarkin, Vadim; Sheldakova, Julia

doi:10.1134/s1024856015040119

Cited by 51 publications

(11 citation statements)

References 9 publications

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“…However, the results here are still available when a stable communication link between Alice and Bob is established and the reference system between them are coincident. To fulfill the requirements, the problems affecting the propagation of beam light need to be solved by referring to the techniques in free space QKD and optical communication, such as ATP [10,11] and adaptive optics system [35].…”

Section: B Analysis Of the Key Rate Of Underwater Qkdmentioning

confidence: 99%

Performance of underwater quantum key distribution with polarization encoding

et al. 2019

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Underwater quantum key distribution (QKD) has potential applications in absolutely secure underwater communication. However, the performance of underwater QKD is limited by the optical elements, background light, and dark counts of the detector. In this paper, we propose a modified formula for the quantum bit error rate (QBER), which takes into account the effect of detector efficiency on the QBER caused by the background light. Then we calculate the QBER of the polarization encoding BB84 protocol in Jerlov type seawater by analyzing the effect of the background light and optical components in a more realistic situation. Finally, we further analyze the final key rate and the maximum secure communication distance in three propagation modes, i.e., upward, downward and horizontal modes. We find that secure QKD can be performed in the clearest Jerlov type seawater at a distance of hundreds of meters, even in the worst downward propagation mode. Specifically, by optimizing the system parameters, it is possible to securely transmit information with a rate of 67kbits/s at a distance of 100 m in the seawater channel with an attenuation coefficient of 0.03/m at night. For practical underwater QKD, the performance can also be improved by using decoy states. Our results are useful to long distance underwater quantum communication.

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Section: B Analysis Of the Key Rate Of Underwater Qkdmentioning

confidence: 99%

Performance of underwater quantum key distribution with polarization encoding

et al. 2019

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“…Additionally, porting the linear algebra functions to specific hardware architectures is part of our future work, which is aimed to decrease the CPU times below the millisecond for the operations associated with Equations ( 10 ) and ( 11 ). According to our experience, this will make the OpenWavefrontReconstructor an interesting option in control systems where the reconstruction is required to be nearly real-time, such as in the adaptive optics [ 4 , 14 ].…”

Section: Openwavefrontreconstructor Implementation Detailsmentioning

confidence: 99%

“…In high-energy lasers production, these aberrations, i.e., imperfections, reduce the wavefront quality, and may also add undesirable effects to the produced beams, which, in turn, may affect the quality of the experimental outcomes wherein the laser is used. Furthermore, a wide range of technical fields benefit from accurate and efficient surface reconstruction algorithms, for instance the astronomical community, pioneering in developing wavefront reconstruction techniques for telescopes [ 1 ], measurements of eye aberrations [ 2 ], optical devices manufacturers, wherein the reconstruction plays a key role by identifying lens manufacturing errors, adaptive optics (AO) such as in microscopy [ 3 ] or data communication through the Earth’s atmosphere [ 4 ], lateral shearing interferometry [ 5 , 6 , 7 ], shape from shading [ 8 ], high energy laser (HEL) beam production control [ 9 ], or ophthalmology in refractive surgery [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Using Spherical-Harmonics Expansions for Optics Surface Reconstruction from Gradients

Solano-Altamirano

Vázquez-Otero²,

Khikhlukha

et al. 2017

Sensors

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In this paper, we propose a new algorithm to reconstruct optics surfaces (aka wavefronts) from gradients, defined on a circular domain, by means of the Spherical Harmonics. The experimental results indicate that this algorithm renders the same accuracy, compared to the reconstruction based on classical Zernike polynomials, using a smaller number of polynomial terms, which potentially speeds up the wavefront reconstruction. Additionally, we provide an open-source C++ library, released under the terms of the GNU General Public License version 2 (GPLv2), wherein several polynomial sets are coded. Therefore, this library constitutes a robust software alternative for wavefront reconstruction in a high energy laser field, optical surface reconstruction, and, more generally, in surface reconstruction from gradients. The library is a candidate for being integrated in control systems for optical devices, or similarly to be used in ad hoc simulations. Moreover, it has been developed with flexibility in mind, and, as such, the implementation includes the following features: (i) a mock-up generator of various incident wavefronts, intended to simulate the wavefronts commonly encountered in the field of high-energy lasers production; (ii) runtime selection of the library in charge of performing the algebraic computations; (iii) a profiling mechanism to measure and compare the performance of different steps of the algorithms and/or third-party linear algebra libraries. Finally, the library can be easily extended to include additional dependencies, such as porting the algebraic operations to specific architectures, in order to exploit hardware acceleration features.

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“…According to [6][7][8], under some "standard" weather conditions the frequency of the WF aberrations of the laser radiation distorted by the turbulent atmosphere rarely exceeds 100 Hz. Thus, the operating speed of a discrete adaptive optical system should be at least ten times higher-1 kHz [9,10].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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The results of a study of the wavefront distortions of laser radiation caused by artificial turbulence obtained in laboratory conditions using a fan heater are presented. Decomposition of the wavefront in terms of Zernike polynomials is a standard procedure that traditionally is used to investigate the set of existing aberrations. In addition, the spectral analysis of the wavefront dynamics makes it possible to estimate the fraction of the energy distributed between different Zernike modes. It is shown that the fraction of energy related to the low-order polynomials is higher compared to the high-order polynomials. Also, one of the consequences of Taylor’s hypothesis is confirmed—low-order aberrations are slower compared to the higher-order ones.

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Adaptive optics system for real-time wavefront correction

Cited by 51 publications

References 9 publications

Performance of underwater quantum key distribution with polarization encoding

Performance of underwater quantum key distribution with polarization encoding

Using Spherical-Harmonics Expansions for Optics Surface Reconstruction from Gradients

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

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