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This study introduces a new method to reduce pointing errors in Dispersed Fringe Sensing (DFS) for dynamic environments. The developed technique achieves high precision co-phasing, crucial for future synthetic aperture telescopes.

Area of Science:

Optical Metrology
Interferometry
Telescope Systems

Background:

High-precision Dispersed Fringe Sensing (DFS) is essential for dynamic environments.
Pointing jitter significantly impacts DFS accuracy.
Mitigating jitter is a prerequisite for advanced optical systems.

Purpose of the Study:

To propose a novel tilt-robust method for Dispersed Fringe Sensing (DFS).
To enable high-precision co-phasing in dynamic environments by mitigating pointing jitter.
To improve the accuracy of piston phase retrieval in the presence of tip/tilt errors.

Main Methods:

Developed a phase decoupled reconstruction (PDR) method.
Utilized the vanishing of tip/tilt-induced phase modulation at the spatial carrier-frequency peak.

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Employed multi-wavelength least-squares unwrapping for absolute piston error retrieval.

Main Results:

The PDR method demonstrated excellent tilt robustness in simulations and experiments.
Achieved a piston retrieval precision of 0.034 μm RMS under continuous sinusoidal pointing jitter.
Validated the method's effectiveness for high-precision co-phasing in challenging conditions.

Conclusions:

The proposed PDR method effectively mitigates pointing jitter in DFS.
This technique is crucial for enabling high-precision co-phasing in future synthetic aperture telescopes.
The study confirms the feasibility of accurate phase retrieval despite dynamic environmental disturbances.