Advances in Optical Technology and Symmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 1734

Special Issue Editors


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Guest Editor
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Interests: freeform optics

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Guest Editor
School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Interests: freeform optics; virtual reality; augmented reality; display technology

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Guest Editor
Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China
Interests: design of free-form imaging and non-imaging optical system; free-form surface machining; free surface detection

Special Issue Information

Dear Colleagues,

Symmetry is inextricably linked with the development of optical technology. The most obvious connection may be reflected in the evolution of optical surface shapes. Traditional optical surface shapes, including spherical, conical, aspherical and cylindrical surfaces, are either rotationally or translationally symmetric. Freeform optical surface shapes with non-symmetric features are gaining popularity in both academia and industry, and have played important roles in lighting, laser beam shaping, progressive glasses, imaging, augmented reality/virtual reality (AR/VR), etc. Symmetry evolution also exists in diffractive optical elements (DOEs), including diffraction gratings, binary optics and metasurfaces.

Unsymmetrical optical systems can provide many advantages over symmetric ones, including better optical performances and compact sizes. However, the design, fabrication, testing and alignment of unsymmetrical optical systems are still considered as difficult tasks that need to be solved or improved. In imaging applications, the computational imaging approach provides an alternative way to produce high imaging performance using symmetric optical elements (e.g., simple lens computational imaging).

The aim of the present Special Issue is to highlight the contributions to the developments in the design, fabrication, testing and alignment of unsymmetrical optical systems, in addition to computational imaging techniques that can reduce the symmetry complexities of optical systems.

We wish to invite you to make a contribution (research or review articles) to this Special Issue. Topics of interest include, but are not limited to, the following:

  • Design, fabrication and testing of aspherical and freeform optics.
  • Design, fabrication and testing of DOEs.
  • Assembly and alignment of unsymmetrical optical systems.
  • Computational imaging using symmetric optical elements.
  • Novel symmetrical and unsymmetrical optical systems in imaging, illumination and display applications.

Dr. Zexin Feng
Prof. Dr. Dewen Cheng
Dr. Xianglong Mao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (1 paper)

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Research

11 pages, 12209 KiB  
Article
The Opto-Mechanical–Thermal Coupling Analysis and Verification of an All-Aluminum Freeform Imaging Telescope
by Rong Gao, Jinpeng Li, Peng Wang, Jiadong Yu, Yongjun Xie and Xianglong Mao
Symmetry 2022, 14(11), 2391; https://doi.org/10.3390/sym14112391 - 11 Nov 2022
Cited by 3 | Viewed by 1312
Abstract
A freeform imaging telescope (FIT) can achieve a large field of view, high resolution, light weight, and small volume at the same time. Single-point diamond turning (SPDT) is usually used to fabricate FITs, which is made entirely of aluminum alloy. Compared with a [...] Read more.
A freeform imaging telescope (FIT) can achieve a large field of view, high resolution, light weight, and small volume at the same time. Single-point diamond turning (SPDT) is usually used to fabricate FITs, which is made entirely of aluminum alloy. Compared with a traditional telescope, whose reflector is made of glass and whose structure is aluminum, the coefficient of thermal expansion (CTE) of the structure and reflector of which is non-conforming, the CTE of the structure and reflector in an all-aluminum FIT is identical. Therefore, it was expected to theoretically have athermalization properties. In this paper, an all-aluminum off-axis three-mirror FIT was verified. The opto-mechanical–thermal coupling analysis of the FIT at −20 °C was carried out, including data processing and coordinate transformation. The reflector node deformation data of the global coordinates obtained from the finite-element analysis were converted into XY polynomial coefficients of the local coordinate system in ZEMAX. The results showed that the modulation transfer function (MTF) of the FIT at −20 °C~+40 °C still reached the diffraction limit. Moreover, the MTF of the FIT at −20 °C was 0.291 through a thermal environmental test, which was almost the same as the MTF at 22 °C. These results showed that the all-aluminum FIT could achieve athermalization properties. Full article
(This article belongs to the Special Issue Advances in Optical Technology and Symmetry)
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