Optical and quasi-optical analysis of system components for a far-infrared space interferometer

C. Bracken, C. O'Sullivan, A. Donohoe, A. Murphy, Giorgio Savini, R. Juanola-Parramon, N. Baccichet, A. Guisseau, P. A R Ade, E. Pascale, L. Spencer, I. Walker, K. Dohlen, J. Lightfoot, W. Holland, Martyn Jones, D. D. Walker, Rebecca A. McMillan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Many important astrophysical processes occur at wavelengths that fall within the far-infrared band of the EM spectrum, and over distance scales that require sub-arc second spatial resolution. It is clear that in order to achieve sub-arc second resolution at these relatively long wavelengths (compared to optical/near-IR), which are strongly absorbed by the atmosphere, a space-based far-IR interferometer will be required. We present analysis of the optical system for a proposed spatial-spectral interferometer, discussing the challenges that arise when designing such a system and the simulation techniques employed that aim to resolve these issues. Many of these specific challenges relate to combining the beams from multiple telescopes where the wavelengths involved are relatively short (compared to radio interferometry), meaning that care must be taken with mirror surface quality, where surface form errors not only present potential degradation of the single system beams, but also serve to reduce fringe visibility when multiple telescope beams are combined. Also, the long baselines required for sub-arc second resolution present challenges when considering propagation of the relatively long wavelengths of the signal beam, where beam divergence becomes significant if the beam demagnification of the telescopes is not carefully considered. Furthermore, detection of the extremely weak far-IR signals demands ultra-sensitive detectors and instruments capable of operating at maximum efficiency. Thus, as will be shown, care must be taken when designing each component of such a complex quasioptical system.

LanguageEnglish
Article number93620N
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume9362
DOIs
Publication statusPublished - 14 Mar 2015
Externally publishedYes
EventInternational Society for Optics and Photonics OPTO Conference 2015 - San Francisco, United States
Duration: 7 Feb 201512 Feb 2015

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Interferometer
Interferometers
Infrared
interferometers
Telescopes
Infrared radiation
Wavelength
Telescope
Arc of a curve
arcs
telescopes
wavelengths
Interferometry
Visibility
Optical systems
Surface properties
Large scale systems
Mirrors
Surface Quality
systems simulation

Cite this

Bracken, C., O'Sullivan, C., Donohoe, A., Murphy, A., Savini, G., Juanola-Parramon, R., ... McMillan, R. A. (2015). Optical and quasi-optical analysis of system components for a far-infrared space interferometer. Proceedings of SPIE - The International Society for Optical Engineering, 9362, [93620N]. https://doi.org/10.1117/12.2076385
Bracken, C. ; O'Sullivan, C. ; Donohoe, A. ; Murphy, A. ; Savini, Giorgio ; Juanola-Parramon, R. ; Baccichet, N. ; Guisseau, A. ; Ade, P. A R ; Pascale, E. ; Spencer, L. ; Walker, I. ; Dohlen, K. ; Lightfoot, J. ; Holland, W. ; Jones, Martyn ; Walker, D. D. ; McMillan, Rebecca A. / Optical and quasi-optical analysis of system components for a far-infrared space interferometer. In: Proceedings of SPIE - The International Society for Optical Engineering. 2015 ; Vol. 9362.
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abstract = "Many important astrophysical processes occur at wavelengths that fall within the far-infrared band of the EM spectrum, and over distance scales that require sub-arc second spatial resolution. It is clear that in order to achieve sub-arc second resolution at these relatively long wavelengths (compared to optical/near-IR), which are strongly absorbed by the atmosphere, a space-based far-IR interferometer will be required. We present analysis of the optical system for a proposed spatial-spectral interferometer, discussing the challenges that arise when designing such a system and the simulation techniques employed that aim to resolve these issues. Many of these specific challenges relate to combining the beams from multiple telescopes where the wavelengths involved are relatively short (compared to radio interferometry), meaning that care must be taken with mirror surface quality, where surface form errors not only present potential degradation of the single system beams, but also serve to reduce fringe visibility when multiple telescope beams are combined. Also, the long baselines required for sub-arc second resolution present challenges when considering propagation of the relatively long wavelengths of the signal beam, where beam divergence becomes significant if the beam demagnification of the telescopes is not carefully considered. Furthermore, detection of the extremely weak far-IR signals demands ultra-sensitive detectors and instruments capable of operating at maximum efficiency. Thus, as will be shown, care must be taken when designing each component of such a complex quasioptical system.",
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Bracken, C, O'Sullivan, C, Donohoe, A, Murphy, A, Savini, G, Juanola-Parramon, R, Baccichet, N, Guisseau, A, Ade, PAR, Pascale, E, Spencer, L, Walker, I, Dohlen, K, Lightfoot, J, Holland, W, Jones, M, Walker, DD & McMillan, RA 2015, 'Optical and quasi-optical analysis of system components for a far-infrared space interferometer', Proceedings of SPIE - The International Society for Optical Engineering, vol. 9362, 93620N. https://doi.org/10.1117/12.2076385

Optical and quasi-optical analysis of system components for a far-infrared space interferometer. / Bracken, C.; O'Sullivan, C.; Donohoe, A.; Murphy, A.; Savini, Giorgio; Juanola-Parramon, R.; Baccichet, N.; Guisseau, A.; Ade, P. A R; Pascale, E.; Spencer, L.; Walker, I.; Dohlen, K.; Lightfoot, J.; Holland, W.; Jones, Martyn; Walker, D. D.; McMillan, Rebecca A.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 9362, 93620N, 14.03.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Optical and quasi-optical analysis of system components for a far-infrared space interferometer

AU - Bracken, C.

AU - O'Sullivan, C.

AU - Donohoe, A.

AU - Murphy, A.

AU - Savini, Giorgio

AU - Juanola-Parramon, R.

AU - Baccichet, N.

AU - Guisseau, A.

AU - Ade, P. A R

AU - Pascale, E.

AU - Spencer, L.

AU - Walker, I.

AU - Dohlen, K.

AU - Lightfoot, J.

AU - Holland, W.

AU - Jones, Martyn

AU - Walker, D. D.

AU - McMillan, Rebecca A.

PY - 2015/3/14

Y1 - 2015/3/14

N2 - Many important astrophysical processes occur at wavelengths that fall within the far-infrared band of the EM spectrum, and over distance scales that require sub-arc second spatial resolution. It is clear that in order to achieve sub-arc second resolution at these relatively long wavelengths (compared to optical/near-IR), which are strongly absorbed by the atmosphere, a space-based far-IR interferometer will be required. We present analysis of the optical system for a proposed spatial-spectral interferometer, discussing the challenges that arise when designing such a system and the simulation techniques employed that aim to resolve these issues. Many of these specific challenges relate to combining the beams from multiple telescopes where the wavelengths involved are relatively short (compared to radio interferometry), meaning that care must be taken with mirror surface quality, where surface form errors not only present potential degradation of the single system beams, but also serve to reduce fringe visibility when multiple telescope beams are combined. Also, the long baselines required for sub-arc second resolution present challenges when considering propagation of the relatively long wavelengths of the signal beam, where beam divergence becomes significant if the beam demagnification of the telescopes is not carefully considered. Furthermore, detection of the extremely weak far-IR signals demands ultra-sensitive detectors and instruments capable of operating at maximum efficiency. Thus, as will be shown, care must be taken when designing each component of such a complex quasioptical system.

AB - Many important astrophysical processes occur at wavelengths that fall within the far-infrared band of the EM spectrum, and over distance scales that require sub-arc second spatial resolution. It is clear that in order to achieve sub-arc second resolution at these relatively long wavelengths (compared to optical/near-IR), which are strongly absorbed by the atmosphere, a space-based far-IR interferometer will be required. We present analysis of the optical system for a proposed spatial-spectral interferometer, discussing the challenges that arise when designing such a system and the simulation techniques employed that aim to resolve these issues. Many of these specific challenges relate to combining the beams from multiple telescopes where the wavelengths involved are relatively short (compared to radio interferometry), meaning that care must be taken with mirror surface quality, where surface form errors not only present potential degradation of the single system beams, but also serve to reduce fringe visibility when multiple telescope beams are combined. Also, the long baselines required for sub-arc second resolution present challenges when considering propagation of the relatively long wavelengths of the signal beam, where beam divergence becomes significant if the beam demagnification of the telescopes is not carefully considered. Furthermore, detection of the extremely weak far-IR signals demands ultra-sensitive detectors and instruments capable of operating at maximum efficiency. Thus, as will be shown, care must be taken when designing each component of such a complex quasioptical system.

KW - Double-Fourier

KW - Far-Infrared (far-IR)

KW - FISICA

KW - Interferometry

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DO - 10.1117/12.2076385

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

T2 - Proceedings of SPIE - The International Society for Optical Engineering

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

SN - 0277-786X

M1 - 93620N

ER -