High numerical aperture multimode fibers for prime focus use

Kaiyuan Zhang, Jessica R. Zheng, Will Saunders

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

5 Citations (Scopus)

Abstract

Modern telescopes typically have prime focus speeds too fast for direct use with standard numerical aperture (NA=0.22±0.02) silica-cored fibers. Specifically, the current design for the proposed Maunakea Spectroscopic Explorer (MSE) telescope is ∼f/2, requiring fibers with NA>0.25. Micro foreoptics can be used to slow the beam, as used on the prime focus spectrograph (PFS) on Subaru, but this adds cost and complexity, and increases losses. An attractive alternative is offered by high NA pure silica-cored fibers, which can be used directly at f/2, and which are now available from multiple vendors. We present throughput and focal ratio degradation measurements on two samples of these high NA fibers. It is found that the measured attenuation losses are comparable with the best available standard NA fibers. The fibers were also tested for focal ratio degradation, and the fiber from CeramOptec was found to have acceptable FRD, representng additional collimator losses ∼1%. The near field performance of the high NA fiber is also investigated and these high NA fibers exhibit very good scrambling performance; we saw no evidence for significant output near-field variations for varying input beam angles or position in a 50m fiber.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
EditorsRamón Navarro, James H. Burge
Place of PublicationBellingham, Washington
PublisherSPIE
Pages99125J-1-99125J-11
Number of pages11
ISBN (Electronic)9781510602038
ISBN (Print)9781510602038
DOIs
Publication statusPublished - 22 Jul 2016
Externally publishedYes
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II - Edinburgh, United Kingdom
Duration: 26 Jun 20161 Jul 2016

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume9912
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
CountryUnited Kingdom
CityEdinburgh
Period26/06/161/07/16

Keywords

  • Fiber spectroscopy
  • FRD
  • High NA fiber
  • MSE
  • Optical fibers

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  • Cite this

    Zhang, K., Zheng, J. R., & Saunders, W. (2016). High numerical aperture multimode fibers for prime focus use. In R. Navarro, & J. H. Burge (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II (pp. 99125J-1-99125J-11). [99125J] (Proceedings of SPIE; Vol. 9912). Bellingham, Washington: SPIE. https://doi.org/10.1117/12.2232131