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Related Concept Videos

Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

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Related Experiment Video

Updated: Jul 6, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Nanometer-level path-length control scheme for nulling interferometry.

E Serabyn1

  • 1Jet Propulsion Laboratory, MS 171-113, 4800 Oak Grove Drive, Pasadena, California 91109, USA. eserabyn@jpl.nasa.gov

Applied Optics
|March 8, 2008
PubMed
Summary
This summary is machine-generated.

A novel method stabilizes a dual-output rotational shearing interferometer for exoplanet detection. This technique uses one output to control the other, achieving nanometer-level accuracy for deep starlight nulling.

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Area of Science:

  • Astronomy and Astrophysics
  • Optical Engineering

Background:

  • Deep starlight nulling is crucial for detecting exoplanets.
  • Achieving nanometer-level accuracy in interferometers is challenging.
  • Rotational shearing interferometers offer potential for high-precision measurements.

Purpose of the Study:

  • To present a method for stabilizing a dual-output rotational shearing interferometer.
  • To achieve nanometer-level accuracy for deep starlight nulling in planet searches.

Main Methods:

  • Utilizing one of the two balanced outputs of a nulling beam combiner to control the other.
  • Implementing a combination of external and internal path-length offsets.
  • Summing path-length offsets to zero for the nulling output and lambda/4 for the control (quadrature) output.

Main Results:

  • Demonstrated subnanometer control of path-length errors.
  • Showcased a 1-nm path-length error corresponding to a 1% output-power variation in the quadrature output.
  • Enabled stabilization of the interferometer to nanometer-level accuracy.

Conclusions:

  • The presented method effectively stabilizes dual-output rotational shearing interferometers.
  • This technique is suitable for the stringent accuracy requirements of deep starlight nulling for exoplanet detection.
  • Subnanometer control is achievable through precise path-length offset management.