UltraLITE glass/composite hybrid mirror

Brian Catanzaro, Dan Keane, Steve Connell, Dave Baiocchi, James H Burge, Arup Maji, Mike Powers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

The mass of the primary mirror has dominated the mass of larger aperture (>1 m class) telescopes. Spaceborne telescopes have much to gain from a significant reduction in areal density. Areal density is often limited by the stiffness to weight ratio of the primary mirror. Two key factors drive this criteria: telescope structural characteristics (launch and deployment) and fabrication requirements. A new class of hybrid composite mirrors has been designed, prototyped, and fabricated to demonstrate the advantage of the high stiffness to weight ratio of carbon fiber composite materials and the superior optical fabrication for low expansion glasses. This hybrid mirror utilizes a unique `set and forget' fabrication technique. A thin meniscus of glass is mounted to a stiff composite support structure using composite flexure rods. The meniscus is lightweighted using waterjet pocket milling and is conventionally polished to a precise radius of curvature. This meniscus is then supported on the flexures and actuated to a precise figure. The flexures are fixed and the actuators are removed. The substrate is then ion figured to achieve the final figure. The areal density of this mirror is 10 kg/m2. Surface figure on a 0.25 m aperture prototype was demonstrated at better than λ/4 (visible) prior to ion figuring. Two 0.6 m mirrors are under fabrication. The design of the mirror and results of the fabrication and testing will be discussed.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages663-671
Number of pages9
Volume4013
StatePublished - 2000
Externally publishedYes
EventUV, Optical, and IR Space Telescopes and Instruments - Munich, Ger
Duration: Mar 29 2000Mar 31 2000

Other

OtherUV, Optical, and IR Space Telescopes and Instruments
CityMunich, Ger
Period3/29/003/31/00

Fingerprint

hybrid composites
Mirrors
mirrors
Fabrication
Glass
Telescopes
glass
Composite materials
flexing
menisci
fabrication
Stiffness
stiffness
spaceborne telescopes
Ions
apertures
Composite structures
telescopes
Carbon fibers
composite materials

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Catanzaro, B., Keane, D., Connell, S., Baiocchi, D., Burge, J. H., Maji, A., & Powers, M. (2000). UltraLITE glass/composite hybrid mirror. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4013, pp. 663-671). Society of Photo-Optical Instrumentation Engineers.

UltraLITE glass/composite hybrid mirror. / Catanzaro, Brian; Keane, Dan; Connell, Steve; Baiocchi, Dave; Burge, James H; Maji, Arup; Powers, Mike.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4013 Society of Photo-Optical Instrumentation Engineers, 2000. p. 663-671.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Catanzaro, B, Keane, D, Connell, S, Baiocchi, D, Burge, JH, Maji, A & Powers, M 2000, UltraLITE glass/composite hybrid mirror. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 4013, Society of Photo-Optical Instrumentation Engineers, pp. 663-671, UV, Optical, and IR Space Telescopes and Instruments, Munich, Ger, 3/29/00.
Catanzaro B, Keane D, Connell S, Baiocchi D, Burge JH, Maji A et al. UltraLITE glass/composite hybrid mirror. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4013. Society of Photo-Optical Instrumentation Engineers. 2000. p. 663-671
Catanzaro, Brian ; Keane, Dan ; Connell, Steve ; Baiocchi, Dave ; Burge, James H ; Maji, Arup ; Powers, Mike. / UltraLITE glass/composite hybrid mirror. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4013 Society of Photo-Optical Instrumentation Engineers, 2000. pp. 663-671
@inproceedings{5c491615b1f0477a93476e7820c649b3,
title = "UltraLITE glass/composite hybrid mirror",
abstract = "The mass of the primary mirror has dominated the mass of larger aperture (>1 m class) telescopes. Spaceborne telescopes have much to gain from a significant reduction in areal density. Areal density is often limited by the stiffness to weight ratio of the primary mirror. Two key factors drive this criteria: telescope structural characteristics (launch and deployment) and fabrication requirements. A new class of hybrid composite mirrors has been designed, prototyped, and fabricated to demonstrate the advantage of the high stiffness to weight ratio of carbon fiber composite materials and the superior optical fabrication for low expansion glasses. This hybrid mirror utilizes a unique `set and forget' fabrication technique. A thin meniscus of glass is mounted to a stiff composite support structure using composite flexure rods. The meniscus is lightweighted using waterjet pocket milling and is conventionally polished to a precise radius of curvature. This meniscus is then supported on the flexures and actuated to a precise figure. The flexures are fixed and the actuators are removed. The substrate is then ion figured to achieve the final figure. The areal density of this mirror is 10 kg/m2. Surface figure on a 0.25 m aperture prototype was demonstrated at better than λ/4 (visible) prior to ion figuring. Two 0.6 m mirrors are under fabrication. The design of the mirror and results of the fabrication and testing will be discussed.",
author = "Brian Catanzaro and Dan Keane and Steve Connell and Dave Baiocchi and Burge, {James H} and Arup Maji and Mike Powers",
year = "2000",
language = "English (US)",
volume = "4013",
pages = "663--671",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "Society of Photo-Optical Instrumentation Engineers",

}

TY - GEN

T1 - UltraLITE glass/composite hybrid mirror

AU - Catanzaro, Brian

AU - Keane, Dan

AU - Connell, Steve

AU - Baiocchi, Dave

AU - Burge, James H

AU - Maji, Arup

AU - Powers, Mike

PY - 2000

Y1 - 2000

N2 - The mass of the primary mirror has dominated the mass of larger aperture (>1 m class) telescopes. Spaceborne telescopes have much to gain from a significant reduction in areal density. Areal density is often limited by the stiffness to weight ratio of the primary mirror. Two key factors drive this criteria: telescope structural characteristics (launch and deployment) and fabrication requirements. A new class of hybrid composite mirrors has been designed, prototyped, and fabricated to demonstrate the advantage of the high stiffness to weight ratio of carbon fiber composite materials and the superior optical fabrication for low expansion glasses. This hybrid mirror utilizes a unique `set and forget' fabrication technique. A thin meniscus of glass is mounted to a stiff composite support structure using composite flexure rods. The meniscus is lightweighted using waterjet pocket milling and is conventionally polished to a precise radius of curvature. This meniscus is then supported on the flexures and actuated to a precise figure. The flexures are fixed and the actuators are removed. The substrate is then ion figured to achieve the final figure. The areal density of this mirror is 10 kg/m2. Surface figure on a 0.25 m aperture prototype was demonstrated at better than λ/4 (visible) prior to ion figuring. Two 0.6 m mirrors are under fabrication. The design of the mirror and results of the fabrication and testing will be discussed.

AB - The mass of the primary mirror has dominated the mass of larger aperture (>1 m class) telescopes. Spaceborne telescopes have much to gain from a significant reduction in areal density. Areal density is often limited by the stiffness to weight ratio of the primary mirror. Two key factors drive this criteria: telescope structural characteristics (launch and deployment) and fabrication requirements. A new class of hybrid composite mirrors has been designed, prototyped, and fabricated to demonstrate the advantage of the high stiffness to weight ratio of carbon fiber composite materials and the superior optical fabrication for low expansion glasses. This hybrid mirror utilizes a unique `set and forget' fabrication technique. A thin meniscus of glass is mounted to a stiff composite support structure using composite flexure rods. The meniscus is lightweighted using waterjet pocket milling and is conventionally polished to a precise radius of curvature. This meniscus is then supported on the flexures and actuated to a precise figure. The flexures are fixed and the actuators are removed. The substrate is then ion figured to achieve the final figure. The areal density of this mirror is 10 kg/m2. Surface figure on a 0.25 m aperture prototype was demonstrated at better than λ/4 (visible) prior to ion figuring. Two 0.6 m mirrors are under fabrication. The design of the mirror and results of the fabrication and testing will be discussed.

UR - http://www.scopus.com/inward/record.url?scp=0033682305&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033682305&partnerID=8YFLogxK

M3 - Conference contribution

VL - 4013

SP - 663

EP - 671

BT - Proceedings of SPIE - The International Society for Optical Engineering

PB - Society of Photo-Optical Instrumentation Engineers

ER -