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Complex spatial coherence function: its measurement by means of a phase-modulated shearing interferometer.

E Ribak, S G Lipson

|March 24, 2010

Summary

A novel stellar interferometer uses parallel shear and phase modulation to measure stellar coherence functions. This design overcomes telescopic and atmospheric aberrations for clearer astronomical observations.

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Area of Science:

Astronomy and Astrophysics
Optical Engineering

Background:

Telescopic and atmospheric aberrations limit the resolution of astronomical observations.
Measuring the complex coherence function of stars is crucial for high-resolution imaging.

Purpose of the Study:

To propose and describe a novel stellar interferometer.
To achieve high mechanical stability and simplicity in design.
To accurately measure stellar coherence functions and mitigate aberrations.

Main Methods:

Utilizes parallel shear and phase modulation for fringe detection.
Employs white light fringes for broad applicability.
Divides the exit pupil into small areas for independent fringe detection and incoherent summation.

Main Results:

The interferometer successfully measures the complex coherence function of a star.
Distinguishes stellar coherence from telescopic and atmospheric aberrations.
Laboratory simulations confirm the system's efficacy.

Conclusions:

The proposed stellar interferometer offers a robust solution for high-fidelity stellar measurements.
Its design effectively overcomes common limitations in astronomical imaging.
This technology has the potential to enhance stellar observation capabilities.