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Related Experiment Video

Updated: May 28, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Speckle-phase measurement in a tandem-vortex coronagraph.

Eugene Serabyn¹, J Kent Wallace, Dimitri Mawet

¹Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA. gene.serabyn@jpl.nasa.gov

|October 22, 2011

Summary

A tandem-vortex coronagraph enables high-contrast imaging and directly measures focal-plane speckle phases. This allows for effective suppression of speckles, improving image quality for astronomical observations.

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Area of Science:

Optical instrumentation
Astronomy
Image processing

Background:

Classical on-axis telescopes face challenges in achieving high-contrast imaging due to scattered light.
Speckles in the focal plane degrade image quality and obscure faint astronomical targets.

Purpose of the Study:

To demonstrate the dual capability of a tandem-vortex coronagraph for both high-contrast imaging and speckle phase measurement.
To enable direct suppression of focal-plane speckles for enhanced astronomical imaging.

Main Methods:

Utilizing a tandem-vortex coronagraph configuration.
Developing a method for direct measurement of focal-plane speckle phases within the coronagraph.

Main Results:

The tandem-vortex coronagraph configuration inherently allows for the measurement of speckle phases.
Speckle phases can be directly measured and utilized for speckle suppression.

Conclusions:

A tandem-vortex coronagraph offers a novel approach to simultaneously achieve high-contrast imaging and active speckle control.
This technique promises to improve the detection limits for faint objects in astronomical observations.