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Recent Advances and Applications of Adaptive Optics

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (20 November 2021) | Viewed by 8243

Special Issue Editor


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Guest Editor
Institute of Geosphere Dynamics, Russian Academy of Sciences, 119334 Moscow, Russia
Interests: adaptive optics; laser mirrors; aberrations; atmospheric light propagation; laser beam applications; optical distortion; optical focusing; optical modulation; wavefront sensors; optical control

Special Issue Information

Dear Colleagues,

Adaptive optics as a field of modern science began in the early 1950s after the publication of pioneer articles by astrophysicists Babcock and Linnik. Until the 1980s, it was in demand by astronomers and military personnel to compensate for the aberrations of laser radiation passed through the turbulent atmosphere. However, due to the development of laser technology and its widespread introduction in the industry, the first works on the application of methods and systems for controlling the wavefront phase in lasers of various types appeared. At the same time, with the development of the physics and technology of laser complexes of terawatt and petawatt intensity levels, it became necessary to use deformable mirrors to improve the focusability of the light radiation on various targets. In the 1990s, papers were published on the use of adaptive optics devices for diagnosing aberrations of the human eye, as well as obtaining a diffraction image of the retina. Thus, adaptive optics has become one of the tools of modern medicine. Finally, in the 2000s, adaptive optics was introduced into microscopy to sharpen images obtained through living tissue (biological direction). There is now a certain renaissance of interest in the propagation of radiation through a turbulent medium, especially along horizontal paths. This is due to the development of optical communication systems, including quantum communication. For almost 70 years, adaptive optics has grown from a small, primarily theoretical, task of controlling the phase of light beams to a major area of modern science, which is at the intersection of scientific and applied problems in optics, atmospheric physics, electronics, laser physics, as well as biology and medicine.

In this Special Issue, we aim to provide a selection of original research articles, reviews, and perspectives reporting the latest advancements in the research of adaptive optics and their applications.

Dr. Vadim Samarkin
Guest Editor

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Keywords

  • adaptive optics
  • atmospheric turbulence
  • deformable mirror
  • wavefront corrector
  • wavefront sensor
  • laser beam correction
  • eye aberrations and ophthalmology
  • image sharpening in microscopy
  • free space optics
  • imagine through turbulence
  • energy transfer through turbulence

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Published Papers (3 papers)

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Research

14 pages, 3449 KiB  
Article
Theory of AdaDelSPGD Algorithm in Fiber Laser-Phased Array Multiplex Communication Systems
by Jiayu Chen, Jinsheng Liu, Long Han, Mingru Ci, Dongbo Che, Lihong Guo and Hongjun Yu
Appl. Sci. 2022, 12(6), 3009; https://doi.org/10.3390/app12063009 - 16 Mar 2022
Cited by 8 | Viewed by 2186
Abstract
Stochastic parallel gradient descent (SPGD) algorithm is one of the most promising methods for effective coherent beam combination. However, the algorithm also has some disadvantages, such as slow convergence speed and local extremum. This paper proposes an AdaDelSPGD algorithm, which combines an AdaDelta [...] Read more.
Stochastic parallel gradient descent (SPGD) algorithm is one of the most promising methods for effective coherent beam combination. However, the algorithm also has some disadvantages, such as slow convergence speed and local extremum. This paper proposes an AdaDelSPGD algorithm, which combines an AdaDelta algorithm with a SPGD algorithm, and improves the traditional AdaDelta algorithm with adaptive gain coefficient. It is worth noting that the adaptive gain coefficient can be adjusted in real time to improve the convergence rate. The effectiveness of the proposed algorithm is verified by relevant simulation experiments, and the results show that the proposed algorithm can significantly improve the convergence speed. Following the experiments with the fiber laser-phased array multiplex communication system, we can draw the conclusion that the addition of communication modulation reduces the beam quality, and the higher the modulation frequency, the worse the beam quality. However, adding the SPGD algorithm can improve the beam quality. The AdaDelSPGD algorithm proposed in this paper can further improve the beam quality, and the bit error rate of communication is also decreased after testing. This provides a foundation for further research on the fiber laser-phased array multiplex communication system. Full article
(This article belongs to the Special Issue Recent Advances and Applications of Adaptive Optics)
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8 pages, 3362 KiB  
Article
Wide-Aperture Bimorph Deformable Mirror for Beam Focusing in 4.2 PW Ti:Sa Laser
by Vadim Samarkin, Alexander Alexandrov, Ilya Galaktionov, Alexis Kudryashov, Alexander Nikitin, Alexey Rukosuev, Vladimir Toporovsky and Julia Sheldakova
Appl. Sci. 2022, 12(3), 1144; https://doi.org/10.3390/app12031144 - 22 Jan 2022
Cited by 22 | Viewed by 2281
Abstract
The bimorph deformable mirror with a diameter of 320 mm, including 127 control electrodes, has been developed and tested. The flatness of the initial mirror surface of about 1 μm (P-V) was achieved by mechanically adjusting the mirror substrate fixed in the metal [...] Read more.
The bimorph deformable mirror with a diameter of 320 mm, including 127 control electrodes, has been developed and tested. The flatness of the initial mirror surface of about 1 μm (P-V) was achieved by mechanically adjusting the mirror substrate fixed in the metal mount. To correct for the aberrations and improve the beam focusing in the petawatt Ti:Sa laser, the wide-aperture adaptive optical system with the deformable mirror and Shack–Hartmann wavefront sensor was developed. Correction of the wavefront aberrations in the 4.2 PW Ti:Sa laser using the adaptive system provided increases the intensity in the focusing plane to a value of 1.1 × 1023 W/cm2 Full article
(This article belongs to the Special Issue Recent Advances and Applications of Adaptive Optics)
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8 pages, 1807 KiB  
Article
Expansion of the Laser Beam Wavefront in Terms of Zernike Polynomials in the Problem of Turbulence Testing
by Alexey Rukosuev, Alexander Nikitin, Vadim Belousov, Julia Sheldakova, Vladimir Toporovsky and Alexis Kudryashov
Appl. Sci. 2021, 11(24), 12112; https://doi.org/10.3390/app112412112 - 19 Dec 2021
Cited by 13 | Viewed by 3022
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Recent Advances and Applications of Adaptive Optics)
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