A laser-truss based optical alignment system on LBT

Rakich, Andrew; Choi, Heejoo; Veillet, Christian; Hill, John M.; Bec, Matthieu; Zhang, Yang; Brendel, Trenton; Sitarski, Breann N.; Gardiner, Michael; Kim, Dae Wook; Rodriguez, Stephanie

doi:10.1117/12.2558013

Cited by 2 publications

(3 citation statements)

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“…Vertical coma, Z8, exhibits no field-dependence with primary mirror Rx rotation as the aberration is oriented perpendicular to the increase in field. Primary functionality of the TMS has been successfully demonstrated at prime focus for monocular mode 11 . The Telescope Metrology System has begun transitioning from "concept testing" and prototyping on LBT to implementation as an integrated part of the Telescope Control System (TCS) 12 .…”

Section: Robust Iterative Fourier Transform-based Dwell Time Algorithm For Ccosmentioning

confidence: 99%

“…Section Very large telescope control system, instrument, and segmentation summarizes optical engineering technology developments for very large telescopes. As a first example, the Large Binocular Telescope (LBT) team is developing a laser-truss based alignment system for maintaining telescope collimation and pointing 11,12 . The laser truss metrology system, able to measure the relative position of optics in six degrees of freedom, is the first of its kind to be implemented on large, ground-based telescopes.…”

Section: Introductionmentioning

confidence: 99%

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Advances in optical engineering for future telescopes

Kim¹,

Choi²,

Brendel³

et al. 2021

OEA

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Significant optical engineering advances at the University of Arizona are being made for design, fabrication, and construction of next generation astronomical telescopes. This summary review paper focuses on the technological advances in three key areas. First is the optical fabrication technique used for constructing next-generation telescope mirrors. Advances in ground-based telescope control and instrumentation comprise the second area of development. This includes active alignment of the laser truss-based Large Binocular Telescope (LBT) prime focus camera, the new MOBI-US modular cross-dispersion spectroscopy unit used at the prime focal plane of the LBT, and topological pupil segment optimization. Lastly, future space telescope concepts and enabling technologies are discussed. Among these, the Nautilus space observatory requires challenging alignment of segmented multi-order diffractive elements. The OASIS terahertz space telescope presents unique challenges for characterizing the inflatable primary mirror, and the Hyperion space telescope pushes the limits of high spectral resolution, far-UV spectroscopy. The Coronagraphic Debris and Exoplanet Exploring Pioneer (CDEEP) is a Small Satellite (SmallSat) mission concept for high-contrast imaging of circumstellar disks and exoplanets using vector vortex coronagraph. These advances in optical engineering technologies will help mankind to probe, explore, and understand the scientific beauty of our universe.

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Section: Robust Iterative Fourier Transform-based Dwell Time Algorithm For Ccosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in optical engineering for future telescopes

Kim¹,

Choi²,

Brendel³

et al. 2021

OEA

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because the general system adopts a method of eliminating first-order dispersion (e.g., a double-glued lens), the system is affected by second-order dispersion. Therefore, the ring mode of the system is considered close to a quadratic function distribution and can be removed through curve fitting [12], [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Fiber-Connected Wavefront-Sensing System for Large Segmented Space Telescopes

Zhang

Wang

et al. 2023

IEEE Photonics J.

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A metrology system capable of cofocusing and cophasing is essential to ensure the performance of large segmented space telescopes, similar to that of monolithic telescopes, as well as to image the faintest galaxies. A fiber-linked-wavefront-sensing system can map pupils from 10 m to 0.1 mm, avoiding the volume, weight, power, and dispersion limitations of free-space light paths. In this study, the coupling efficiency was investigated while cofocusing on the telescope-mirror segments. Fiber-linked-channel-spectrum interferometry was proposed to accomplish fine phasing, and a photonic lantern was proposed to achieve coarse phasing. The cofocus and cophasing accuracies exceeded 12 µm and 15 nm, respectively, in the 170 µm range. This study aimed to resolve the problems of restricted optical path spaces and decoherence encountered during the cofocusing and cophasing processes of large-space telescopes. It also expands the application range of astronomical photonics in large-space telescopes. The size and mass of the optical alignment system directly limit the amount of fuel and coolant used for the operation of large-or sparse-aperture telescopes in space. The use of fiber-optic interconnection systems can significantly reduce the mass and inertia of the telescope, which is crucial for large-aperture-space-telescope construction.

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A laser-truss based optical alignment system on LBT

Cited by 2 publications

References 0 publications

Advances in optical engineering for future telescopes

Advances in optical engineering for future telescopes

Fiber-Connected Wavefront-Sensing System for Large Segmented Space Telescopes

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