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Optical phasing method based on scanning white-light interferometry for multi-aperture optical telescopes.

Yang Li, Sheng-Qian Wang

|February 12, 2021

Summary

This summary is machine-generated.

A new scanning white-light interferometry (SWLI) method accurately detects piston errors in multi-aperture optical telescopes. This technique offers millimeter-level measurement range and sub-wavelength accuracy for improved telescope phasing.

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Area of Science:

Optical Engineering
Astronomy Instrumentation

Background:

Multi-aperture optical telescopes require precise phasing to achieve optimal performance.
Piston errors, a common wavefront aberration, degrade the image quality of these complex systems.

Purpose of the Study:

To propose and validate a novel sensing approach for detecting piston errors in multi-aperture optical telescopes.
To introduce a method utilizing scanning white-light interferometry (SWLI) for precise wavefront error measurement.

Main Methods:

Development of a scanning white-light interferometer (SWLI) system.
Integration of a Mach-Zehnder interferometer (MZI) and an optical path modulator (OPM).
Utilizing a lenslet array to image interferometric wavefronts and estimate piston errors from SWLI signals.

Main Results:

Demonstrated a proof of concept for the proposed piston error detection method.
Achieved a measurement range up to the millimeter order.
Obtained an accuracy better than 1/20th of a wavelength.

Conclusions:

The proposed SWLI method is feasible and effective for phasing multi-aperture optical telescopes.
The amplitude-splitting interferometry of the MZI is well-suited for multi-aperture telescope applications.
This technique provides a robust solution for correcting piston errors in large optical systems.