Keck Planet Finder: Zerodur optical bench mechanical design

Smith, Christopher L.; Gibson, Steven R.; Howard, Andrew W.; Edelstein, Jerry; Wishnow, Edward H.; Rider, Kodi

doi:10.1117/12.2313969

Cited by 2 publications

(5 citation statements)

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“…In the following a few examples from the publications are given on different methods of bonding ZERODUR ® to other materials. [1] The Keck Planet Finder (KPF) is a fiber-fed high resolution, high stability spectrometer for the W.M. Keck Observatory designed by a group of the Space Sciences Laboratory, University of California, Berkeley and the California Institute of Technology in Pasadena [1].…”

Section: Some Examples Of Zerodur ® Bonding From Literaturmentioning

confidence: 99%

“…[1] The Keck Planet Finder (KPF) is a fiber-fed high resolution, high stability spectrometer for the W.M. Keck Observatory designed by a group of the Space Sciences Laboratory, University of California, Berkeley and the California Institute of Technology in Pasadena [1]. The optical bench of the instrument is about 2 m in diameter and 132 mm in thickness with several complex designed pocket geometries.…”

Section: Some Examples Of Zerodur ® Bonding From Literaturmentioning

confidence: 99%

“…Apart from the bench, some of the optical elements and mounts of the KPF optics are also made of ZERODUR ® . A critical issue according to the paper was to optimize the stability of the optical mount which can be affected by temperature gradients within the spectrometer or the vibration environment [1].…”

Section: Some Examples Of Zerodur ® Bonding From Literaturmentioning

confidence: 99%

“…Figure 2: Example of mechanical mounting ZERODUR ® optics to a ZERODUR ® optical bench fixed by spring units against ZERODUR ® shim stacks as shown in the Keck Planet Finder ZERODUR ® optical bench design in [1] The optical component mounting design takes advantage of the low CTE of ZERODUR ® by having only ZERODUR ® elements control the position of the optics. ZERODUR ® optics are mounted in a ZERODUR ® bench with ZERODUR ® shims between them (with springs providing the retention force).…”

Section: Mechanical Mounting Example: Keck Planet Finder Optical Benchmentioning

confidence: 99%

“…Some, but not all, of the components have vertical spring clamps as well (if the design loads require them). More details can be found in [1].…”

Section: Mechanical Mounting Example: Keck Planet Finder Optical Benchmentioning

confidence: 99%

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Dos and don’ts in mounting ZERODUR

Jedamzik,

Esemann,

Kunisch

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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Because of its extremely low thermal expansion glass ceramic ZERODUR ® is widely used as mirror substrate material in earth-bound and space-borne astronomy or as structural parts in integrated-circuit and flat panel display lithography (to name only some of its wide applications). In all its applications it needs to be mounted in some way to a support structure to enable its functionality. Common examples used in astronomical telescopes are epoxy bonding of invar pads to the ZERODUR ® mirror blanks or epoxy-free mechanical clamping of ZERODUR ® parts to support frames.The mounting should not influence the functionality by inducing thermo-mechanical deformation on the ZERODUR ® part. But even more important the bonding procedure should prevent inducing high stresses to the mounting interface that potentially reduces the lifetime of the mount.The achievable strength of ZERODUR ® strongly depends on its surface treatment. Generally, mechanical strengths of around 100 MPa are achieved on fine ground and acid etched ZERODUR ® surfaces. When becoming interfaces, the reliability of the mount is not only influenced by the initial strength of these surfaces but also on the choice of the epoxy, the mounting material and even the geometrical configuration of the bonding.This paper gives a guideline on the "dos" and "don'ts" in mounting ZERODUR ® supplemented by practical examples from literature.

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Section: Some Examples Of Zerodur ® Bonding From Literaturmentioning

confidence: 99%

Section: Some Examples Of Zerodur ® Bonding From Literaturmentioning

confidence: 99%

Section: Some Examples Of Zerodur ® Bonding From Literaturmentioning

confidence: 99%

Section: Mechanical Mounting Example: Keck Planet Finder Optical Benchmentioning

confidence: 99%

“…Some, but not all, of the components have vertical spring clamps as well (if the design loads require them). More details can be found in [1].…”

Section: Mechanical Mounting Example: Keck Planet Finder Optical Benchmentioning

confidence: 99%

See 3 more Smart Citations

Dos and don’ts in mounting ZERODUR

Jedamzik,

Esemann,

Kunisch

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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show abstract

Keck Planet Finder: preliminary design

Gibson

Howard²,

Roy³

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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The Keck Planet Finder (KPF) is a fiber-fed, high-resolution, high-stability spectrometer in development for the W.M. Keck Observatory. The instrument recently passed its preliminary design review and is currently in the detailed design phase. KPF is designed to characterize exoplanets using Doppler spectroscopy with a single measurement precision of 0.5 m s −1 or better; however, its resolution and stability will enable a wide variety of other astrophysical pursuits. KPF will have a 200 mm collimated beam diameter and a resolving power greater than 80,000. The design includes a green channel (445 nm to 600 nm) and red channel (600 nm to 870 nm). A novel design aspect of KPF is the use of a Zerodur optical bench, and Zerodur optics with integral mounts, to provide stability against thermal expansion and contraction effects.

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Keck Planet Finder: Zerodur optical bench mechanical design

Cited by 2 publications

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Dos and don’ts in mounting ZERODUR

Dos and don’ts in mounting ZERODUR

Keck Planet Finder: preliminary design

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