Development of integrated "photonic-dicers" for reformatting the point-spread-function of a telescope

David Guillaume MacLachlan, Robert Harris, Debaditya Choudhury, Alexander Arriola, Graeme Brown, Jeremy Allington-Smith, Robert R. Thomson

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

Abstract

Spectroscopy is a technique of paramount importance to astronomy, as it enables the chemical composition, distances and velocities of celestial objects to be determined. As the diameter of a ground-based telescope increases, the point-spread- function (PSF) becomes increasingly degraded due to atmospheric seeing. A degraded PSF requires a larger spectrograph slit-width for efficient coupling and current spectrographs for large telescopes are already on the metre scale. This presents numerous issues in terms of manufacturability, cost and stability.

As proposed in 2010 by Bland-Hawthorn et al, one approach which may help to improve spectrograph stability is a guided wave transition, known as a "photonic-lantern". These devices enable the low-loss reformatting of a multimode PSF into a diffraction-limited source (in one direction). This pseudo-slit can then be used as the input to a traditional spectrograph operating at the diffraction limit. In essence, this approach may enable the use of diffraction-limited spectrographs on large telescopes without an unacceptable reduction in throughput.

We have recently demonstrated that ultrafast laser inscription can be used to realize "integrated" photonic-lanterns, by directly writing three-dimensional optical waveguide structures inside a glass substrate. This paper presents our work on developing ultrafast laser inscribed devices capable of reformatting a multimode telescope PSF into a diffraction-limited slit.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation
EditorsR Navarro, CR Cunningham, AA Barto
Place of PublicationBellingham
PublisherSPIE
Number of pages7
DOIs
Publication statusPublished - 2014
EventConference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation - Montreal, Canada
Duration: 23 Jun 201427 Jun 2014

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume9151
ISSN (Print)0277-786X

Conference

ConferenceConference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
CountryCanada
Period23/06/1427/06/14

Keywords

  • Waveguides
  • photonic-lantern
  • adaptive-optics
  • spectroscopy
  • ultrafast laser inscription
  • ULTRAFAST LASER INSCRIPTION
  • FEMTOSECOND LASER
  • WAVE-GUIDES
  • MULTIMODE
  • ASTROPHOTONICS
  • GRATINGS
  • LANTERN

Cite this

MacLachlan, D. G., Harris, R., Choudhury, D., Arriola, A., Brown, G., Allington-Smith, J., & Thomson, R. R. (2014). Development of integrated "photonic-dicers" for reformatting the point-spread-function of a telescope. In R. Navarro, CR. Cunningham, & AA. Barto (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation [91511W ] (Proceedings of SPIE; Vol. 9151). SPIE. https://doi.org/10.1117/12.2055904