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Deep nulling by means of multiple-beam recombination.
Arjan L Mieremet1, Joseph J M Braat
1Optics Research Group, Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. A.L.Mieremet@tnw.tudelft.nl
Applied Optics
|April 10, 2003
Summary
Nulling interferometry can detect exoplanets by canceling starlight. Relaxing phase shifter error constraints with multiple beams and dispersive elements enhances rejection ratios for infrared observations.
Area of Science:
- Astronomy and Astrophysics
- Optical Engineering
Background:
- Direct exoplanet detection is challenging due to starlight's brightness.
- Nulling interferometry uses destructive interference to suppress starlight, enabling faint exoplanet observation.
Purpose of the Study:
- To investigate methods for improving nulling interferometry's rejection ratio.
- To explore relaxing phase shifter precision constraints in infrared observations.
Main Methods:
- Utilizing nulling interferometry with phase shifters for starlight suppression.
- Analyzing the impact of multi-beam recombination on phase shifter error tolerance.
- Focusing on dispersive phase shifters for beam combination.
Main Results:
- A rejection ratio of 10^6 is achievable with phase shifters having an average error not greater than 2 mrad.
- The 2-mrad constraint can be relaxed by employing more than two beams in the recombination process.
- Rejection ratios exceeding 10^6 are readily attainable with four or more apertures and simple dispersive phase shifters.
Conclusions:
- Multi-beam nulling interferometry systems relax stringent phase shifter requirements.
- Dispersive phase shifters in multi-aperture systems offer a practical approach to achieving high rejection ratios for exoplanet detection.