Air-clad fibres for astronomical instrumentation: focal-ratio degradation

Details Air-clad fibres for astronomical instrumentation: focal-ratio degradation Air-clad fibres for astronomical instrumentation: focal-ratio degradation

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009exa....24....1a&link_type=abstract

Experimental Astronomy, Volume 24, Issue 1-3, pp. 1-7

Astronomy and Astrophysics

Astronomy

1

Focal-Ratio Degradation, High-Numerical Aperture, Air-Clad Fibres

Scientific paper

Focal-ratio degradation (FRD) of light launched into high-numerical aperture (NA) single-annulus all-silica undoped air-clad fibres at an NA of 0.54 is reported. The measured annular light distribution remained Gaussian after 30 m of propagation, but the angular FWHM of the output annulus doubled from 4° after 1 m propagation to 8.5° after 30 m, which is significantly larger than that reported of standard doped-silica fibres (NA < 0.22). No significant diffractive effects were observed. The design of air-clad fibres for broad-band, high-NA astrophotonics applications is discussed.

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