Interferometric measurement of a concave, φ-polynomial, Zernike mirror

Fuerschbach, Kyle; Thompson, Kevin P.; Rolland, Jannick P.

doi:10.1364/ol.39.000018

Cited by 52 publications

(17 citation statements)

References 6 publications

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“…DM can also be combined with conventional null lenses for measuring freeform surfaces, e.g., the Zernike mirror. [ 114 ] It is mainly responsible for compensating the nonrotationally symmetric aberrations such as coma and astigmatism in a tilted configuration while the SA is compensated by the null lenses. The major problem of DM is its relatively lower accuracy and limited range of modulation for generating freeform aberrations because of the limited number of actuators with limited strokes.…”

Section: Interferometric Areal Measurementmentioning

confidence: 99%

Measurement of Freeform Optical Surfaces: Trade‐Off between Accuracy and Dynamic Range

Chen

Xue

Zhai

et al. 2020

Laser & Photonics Reviews

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Freeform optical surfaces are advantageous to optical designers, as they provide additional degrees of freedom for optimization. The loss of rotational symmetry, however, makes measurement of freeforms more challenging. Herein, advances in interferometric areal measurement of freeform optical surfaces, including null tests, non-null tests, near-null tests, and adaptive null tests, are reviewed. Some new developments, in the Hartmann test, deflectometry, and phase retrieval, as representatives of non-interferometric areal measurement, are then presented. Overall, the focus is on single-point-probe-based profilometry categorized into coordinate measurements and slope-or curvature-based measurements. Innovative measurement technology is trying to bridge the gap between high accuracy and high dynamic range as freeform optical surfaces are finding more applications in visible and shorter-wavelength optics.

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Section: Interferometric Areal Measurementmentioning

confidence: 99%

Measurement of Freeform Optical Surfaces: Trade‐Off between Accuracy and Dynamic Range

Chen

Xue

Zhai

et al. 2020

Laser & Photonics Reviews

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“…For this telescope, the metrology process uses a hybrid interferometric near-null test. 6 The interferometric null uses a combination of a traditional Offner null lens (for spherical, Fringe Zernike Z9 correction), tilting the mirror (for astigmatism, Fringe Zernike Z5/Z6 correction), and a re-imaging relay that interfaced to combination deformable mirror with an independent Shack-Hartmann sensor (for coma, Fringe Zernike Z7/Z8 correction). As an example, Figure 4 (a) shows the metrology configuration for the concave, secondary mirror of the telescope system.…”

Section: Primary Secondary Tertiarymentioning

confidence: 99%

Pamplemousse: The optical design, fabrication, and assembly of a three-mirror freeform imaging telescope

Rolland¹,

Fuerschbach²,

Davis³

et al. 2014

SPIE Proceedings

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“…However, if the goal is to minimize departure from a conic for testability with null optics, they constitute a viable path. 2,3 "Grown" surfaces are solved for using differential equations and are freeform surfaces. The freeform "grown" surfaces have more degrees of freedom for aberration compared to conic surfaces but are the most complicated to implement and are currently limited to two mirrors (a four-mirror system can be generated by putting two "grown" surface systems back-to-back).…”

Section: Introductionmentioning

confidence: 99%

Starting point designs for freeform four-mirror systems

2018

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Driven by the development of freeform four-mirror solutions, we review and compare analytical methods to generate starting point designs with various states of correction, surface types, symmetry, and obscuration. The advantages and disadvantages of each are examined. We have combined several concepts and techniques from the literature to analytically generate unobscured freeform starting point designs that are corrected through the third-order image degrading aberrations. The surfaces in these starting point designs are described as base off-axis conics that image stigmatically for the central field point, also known as Cartesian reflectors, with an aspheric departure "cap" (quartic with the aperture) added to the Cartesian reflectors. Tilt angles are chosen to cancel field-asymmetric field-linear astigmatism and unobscure the system. Paraxial data from an equivalent on-axis system are used to solve a system of linear equations to determine the magnitude of the aspheric departure "caps" that are placed on top of the base Cartesian reflectors, in order to eliminate the remaining third-order image degrading aberrations. In this approach, each aspheric departure "cap" is centered about the intersection of the optical-axis-ray, also known as the base ray, with the base surface, rather than being centered about the axis of rotational invariance. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 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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Interferometric measurement of a concave, φ-polynomial, Zernike mirror

Cited by 52 publications

References 6 publications

Measurement of Freeform Optical Surfaces: Trade‐Off between Accuracy and Dynamic Range

Measurement of Freeform Optical Surfaces: Trade‐Off between Accuracy and Dynamic Range

Pamplemousse: The optical design, fabrication, and assembly of a three-mirror freeform imaging telescope

Starting point designs for freeform four-mirror systems

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