Simulation and optimisation of an astrophotonic reformatter

Th Anagnos, R. J. Harris, M. K. Corrigan, A. P. Reeves, M. J. Townson, D. G. MacLachlan, R. R. Thomson, T. J. Morris, C. Schwab, A. Quirrenbach

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Image slicing is a powerful technique in astronomy. It allows the instrument designer to reduce the slit width of the spectrograph, increasing spectral resolving power whilst retaining throughput. Conventionally this is done using bulk optics, such as mirrors and prisms, however, more recently astrophotonic components known as photonic lanterns and photonic reformatters have also been used. These devices reformat the multimode input light from a telescope into single-mode outputs, which can then be re-arranged to suit the spectrograph. The photonic dicer (PD) is one such device, designed to reduce the dependence of spectrograph size on telescope aperture and eliminate modal noise. We simulate the PD, by optimizing the throughput and geometrical design using SOAPY and BEAMPROP. The simulated device shows a transmission between 8 and 20 per cent, depending upon the type of adaptive optics correction applied, matching the experimental results well. We also investigate our idealized model of the PD and show that the barycentre of the slit varies only slightly with time, meaning that the modal noise contribution is very low when compared to conventional fibre systems. We further optimize our model device for both higher throughput and reduced modal noise. This device improves throughput by 6.4 per cent and reduces the movement of the slit output by 50 per cent, further improving stability. This shows the importance of properly simulating such devices, including atmospheric effects. Our work complements recent work in the field and is essential for optimizing future photonic reformatters.

LanguageEnglish
Pages4881-4889
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume478
Issue number4
DOIs
Publication statusPublished - 21 Aug 2018

Fingerprint

photonics
optimization
spectrographs
simulation
slits
astronomy
telescopes
atmospheric effects
slicing
center of gravity
output
retaining
adaptive optics
complement
prisms
apertures
optics
mirrors
fibers
fibre

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 4, 21 August 2018, Pages 4881–4889, https://doi.org/10.1093/mnras/sty1396. Copyright 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

  • Instrumentation: adaptive optics
  • Instrumentation: spectrographs

Cite this

Anagnos, T., Harris, R. J., Corrigan, M. K., Reeves, A. P., Townson, M. J., MacLachlan, D. G., ... Quirrenbach, A. (2018). Simulation and optimisation of an astrophotonic reformatter. Monthly Notices of the Royal Astronomical Society, 478(4), 4881-4889. https://doi.org/10.1093/mnras/sty1396
Anagnos, Th ; Harris, R. J. ; Corrigan, M. K. ; Reeves, A. P. ; Townson, M. J. ; MacLachlan, D. G. ; Thomson, R. R. ; Morris, T. J. ; Schwab, C. ; Quirrenbach, A. / Simulation and optimisation of an astrophotonic reformatter. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 478, No. 4. pp. 4881-4889.
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Anagnos, T, Harris, RJ, Corrigan, MK, Reeves, AP, Townson, MJ, MacLachlan, DG, Thomson, RR, Morris, TJ, Schwab, C & Quirrenbach, A 2018, 'Simulation and optimisation of an astrophotonic reformatter', Monthly Notices of the Royal Astronomical Society, vol. 478, no. 4, pp. 4881-4889. https://doi.org/10.1093/mnras/sty1396

Simulation and optimisation of an astrophotonic reformatter. / Anagnos, Th; Harris, R. J.; Corrigan, M. K.; Reeves, A. P.; Townson, M. J.; MacLachlan, D. G.; Thomson, R. R.; Morris, T. J.; Schwab, C.; Quirrenbach, A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 478, No. 4, 21.08.2018, p. 4881-4889.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Thomson, R. R.

AU - Morris, T. J.

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AU - Quirrenbach, A.

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Anagnos T, Harris RJ, Corrigan MK, Reeves AP, Townson MJ, MacLachlan DG et al. Simulation and optimisation of an astrophotonic reformatter. Monthly Notices of the Royal Astronomical Society. 2018 Aug 21;478(4):4881-4889. https://doi.org/10.1093/mnras/sty1396