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Modal filtering for midinfrared nulling interferometry using single mode silver halide fibers.

A Ksendzov1, T Lewi, O P Lay

  • 1Jet Propulsion Laboratory, California Institute of Technology 4800 Oak Grove Drive, Pasadena, California 91109, USA. alexander.ksendzov@jpl.nasa.gov

Applied Optics
|January 6, 2009
PubMed
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Newly developed silver halide fibers show excellent modal filtering for mid-infrared wavelengths. These single-mode fibers significantly suppress unwanted light, aiding in exoplanet detection with space-based interferometers.

Area of Science:

  • Optics and Photonics
  • Astronomy and Astrophysics

Background:

  • Single-mode fibers are crucial for precise optical measurements.
  • Mid-infrared wavelengths are important for detecting Earth-like exoplanets.

Purpose of the Study:

  • To evaluate the modal filtering capabilities of novel silver halide fibers.
  • To achieve high suppression of nonfundamental modes for exoplanet detection.

Main Methods:

  • Testing fiber segments of varying lengths (4.5 cm to 20 cm).
  • Measuring modal filtering performance at mid-infrared wavelengths (centered at 10.5 microm).
  • Investigating the impact of cladding modes and output aperturing.

Main Results:

  • Silver halide fibers demonstrate significant modal filtering properties.

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  • Suppression of nonfundamental modes exceeded a factor of 15,000 for 10.5-20 cm sections.
  • Cladding modes were identified as a limiting factor, but manageable with output aperturing.

    • Conclusions:

    • The developed silver halide fibers meet and exceed requirements for exoplanet characterization.
    • Even short fiber sections provide adequate modal filtering for space-based nulling interferometry.
    • Further development could enhance performance for future astronomical applications.