Off-axis parabolic mirror for concentrating the radiation of a picosecond laser

Borodin, V. G.; Migel, V. M.; Paraka, A. V.; Charukhchev, A. V.; Chekal, V. N.

doi:10.1364/jot.69.000051

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“…Off-axis parabolic (OAP) mirrors have been studied for over a century because of their unique property of ideal focus, which does not depend on the relative location of the OAP with respect to the reference optical axis (ROA). Poor considered the aberration, 1 Borodin et al 2 concentrated on the radiation of a picosecond laser, Burke 3 examined the null test, and Howard 4 examined the imaging properties of an OAP. Cardona-Nuñez et al [5][6][7] investigated and characterized parabolic segments using toroidal and conic surfaces that fit an off-axis conic section.…”

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“…The ðx; u; vÞ co-ordinate system is shown in red.Journal of Astronomical Telescopes, Instruments, and Systems 024010-2Apr-Jun 2019 • Vol. 5(2)…”

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“…At the same time, this geometry can also be understood as the projection of a circular aperture onto a paraboloid.Journal of Astronomical Telescopes, Instruments, and Systems 024010-5Apr-Jun 2019 • Vol. 5(2)…”

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Parametric geometry analysis for circular-aperture off-axis parabolic mirror segment

Han

Lee

Kim

2019

J. Astron. Telesc. Instrum. Syst.

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We investigated the geometrical characteristics of circular-aperture off-axis parabolic (OAP) mirror segments to clarify the meaning of the loosely defined word "center" used in the literature and in documents to describe OAPs. We proposed the elliptical aperture center of an OAP as the definition of the center. The off-axis distance (OAD) is the vertical distance from the reference optical axis to the aperture center. In addition, the OAD can be varied depending on the desired center of a circular aperture to select the part of a parallel beam for focusing. The radius of the circular aperture becomes the minor-axis semidiameter of the elliptical aperture of the OAP. These geometrical parameters were systematically defined, derived, and/or analyzed in the context of optical engineering applications. Based on a set of those fundamental parameters, an intrinsic datum point utilizing the deepest point on the OAP surface was presented. The datum point provides a well-defined reference co-ordinate frame for locating or aligning an OAP within various astronomical telescope designs, instrument manufacturing and assembly processes, and optical system alignment and testing applications. © The Authors.Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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