How to inject light efficiently into single-mode fibers

Nemanja Jovanovic, Olivier Guyon, Frantz Martinache, Christian Schwab, Nick Cvetojevic

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

25 Scopus citations

Abstract

A key avenue to improving the precision of radial velocity measurements is by using photonic devices to collect the light from the focal plane and delivering the beams to the slit of spectrograph via a single-mode fiber. Single-mode fibers have the favorable property that they allow light to propagate in a single energy distribution characterized by a Gaussian shape with a flat wavefront which is temporarily stable and independent of changes to the injection. These properties mean that the point spread function delivered to the input slit of a spectrograph is highly stable with time and independent of changes to the injection which is currently a key limitation to precision radial velocity measurements and known as "Modal Noise". Further light delivery via single-mode fibers is the key requirement to realize long baseline interferometers such as the Optical Hawaiian Array for Nanoradian Astronomy. Injecting into single-mode fibers efficiently is inherently difficult because it requires closely matching the intensity and wavefront of the focused beam to that supported by the fiber. The atmosphere is currently the key roadblock to efficient injection. However, extreme adaptive optics systems such as Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system currently being commissioned will enable high order wavefront correction and make efficient coupling into single-mode fibers possible. In addition, pupil apodization optics used for coronagraphy, known as phase induced amplitude apodization lenses also present in the SCExAO instrument, allow for close matching of the intensity distributions. We report on the progress and lessons learnt on developing an efficient single-mode injection unit within the SCExAO instrument. As part of the PANDORA project we aim to use this injection and combine it with several other photonic technologies to enable high precision radial velocity measurements in new and innovative ways.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy V
EditorsSuzanne K. Ramsay, Ian S. McLean, Hideki Takami
PublisherSPIE
ISBN (Electronic)9780819496157
DOIs
StatePublished - Jan 1 2014
EventGround-Based and Airborne Instrumentation for Astronomy V - Montreal, Canada
Duration: Jun 22 2014Jun 26 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9147
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherGround-Based and Airborne Instrumentation for Astronomy V
CountryCanada
CityMontreal
Period6/22/146/26/14

Keywords

  • Extreme adaptive optics
  • Modal noise
  • Precision radial velocity measurements
  • Pupil apodization
  • SCExAO
  • Single-mode fiber
  • astrophotonics
  • photonic lanterns

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Jovanovic, N., Guyon, O., Martinache, F., Schwab, C., & Cvetojevic, N. (2014). How to inject light efficiently into single-mode fibers. In S. K. Ramsay, I. S. McLean, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy V [91477P] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9147). SPIE. https://doi.org/10.1117/12.2057210