Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy

David Guillaume MacLachlan, Robert J. Harris, I. Gris-Sanchez, T. J. Morris, Debaditya Choudhury, Eric Gendron, Alastair Basden, Izabela Spaleniak, Alexander Arriola, Timothy A. Birks, Jeremy R. Allington-Smith, Robert R. Thomson

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
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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-optimised guided-wave device can be used with AO to provide efficient spectroscopy at high spectral resolution.
Original languageEnglish
Pages (from-to)4950-4957
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date6 Oct 2016
Publication statusPublished - 1 Feb 2017


  • instrumentation: adaptive optics
  • instrumentation: spectrographs

ASJC Scopus subject areas

  • General Physics and Astronomy


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