Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy

D. G. MacLachlan, R. J. Harris, I. Gris-Sánchez, T. J. Morris, D. Choudhury, E. Gendron, A. G. Basden, I. Spaleniak, A. Arriola, T. A. Birks, J. R. Allington-Smith, R. R. Thomson

Research output: Contribution to journalArticle

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Abstract

The spectral resolution of a dispersive astronomical spectrograph is limited by the trade-off between throughput and the width of the entrance slit. Photonic guided wave transitions have been proposed as a route to bypass this trade-off, by enabling the efficient reformatting of incoherent seeing-limited light collected by the telescope into a linear array of single modes: a pseudo-slit which is highly multimode in one axis but diffraction-limited in the dispersion axis of the spectrograph. It is anticipated that the size of a single-object spectrograph fed with light in this manner would be essentially independent of the telescope aperture size. A further anticipated benefit is that such spectrographs would be free of 'modal noise', a phenomenon that occurs in high-resolution multimode fibre-fed spectrographs due to the coherent nature of the telescope point spread function (PSF). We seek to address these aspects by integrating a multicore fibre photonic lantern with an ultrafast laser inscribed three-dimensional waveguide interconnect to spatially reformat the modes within the PSF into a diffraction-limited pseudo-slit. Using the CANARY adaptive optics (AO) demonstrator on the William Herschel Telescope, and 1530 ± 80 nm stellar light, the device exhibits a transmission of 47-53 per cent depending upon the mode of AO correction applied.We also show the advantage of using AO to couple light into such a device by sampling only the core of the CANARY PSF. This result underscores the possibility that a fully optimized guided-wave device can be used with AO to provide efficient spectroscopy at high spectral resolution.

LanguageEnglish
Pages4950-4957
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume464
Issue number4
Early online date6 Oct 2016
DOIs
StatusPublished - Feb 2017

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diffraction
spectrographs
adaptive optics
spectroscopy
photonics
point spread functions
telescopes
slits
spectral resolution
trade-off
bypass
fibers
bypasses
high resolution
linear arrays
laser
entrances
apertures
sampling
routes

Keywords

  • Instrumentation: adaptive optics
  • Instrumentation: spectrographs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

MacLachlan, D. G., Harris, R. J., Gris-Sánchez, I., Morris, T. J., Choudhury, D., Gendron, E., ... Thomson, R. R. (2017). Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy. Monthly Notices of the Royal Astronomical Society, 464(4), 4950-4957. https://doi.org/10.1093/mnras/stw2558

Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy. / MacLachlan, D. G.; Harris, R. J.; Gris-Sánchez, I.; Morris, T. J.; Choudhury, D.; Gendron, E.; Basden, A. G.; Spaleniak, I.; Arriola, A.; Birks, T. A.; Allington-Smith, J. R.; Thomson, R. R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 464, No. 4, 02.2017, p. 4950-4957.

Research output: Contribution to journalArticle

MacLachlan, DG, Harris, RJ, Gris-Sánchez, I, Morris, TJ, Choudhury, D, Gendron, E, Basden, AG, Spaleniak, I, Arriola, A, Birks, TA, Allington-Smith, JR & Thomson, RR 2017, 'Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy' Monthly Notices of the Royal Astronomical Society, vol. 464, no. 4, pp. 4950-4957. https://doi.org/10.1093/mnras/stw2558
MacLachlan, D. G. ; Harris, R. J. ; Gris-Sánchez, I. ; Morris, T. J. ; Choudhury, D. ; Gendron, E. ; Basden, A. G. ; Spaleniak, I. ; Arriola, A. ; Birks, T. A. ; Allington-Smith, J. R. ; Thomson, R. R. / Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 464, No. 4. pp. 4950-4957.
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