Demonstration of extended capture range for James Webb Space Telescope phase retrieval

Area of Science:

• * Astronomy and Astrophysics
• * Optical Engineering
• * Image Processing

Background:

• * Current phase retrieval (PR) methods for the James Webb Space Telescope (JWST) have limitations in their capture range.
• * Image stacking, often reliant on centroids, is a time-consuming process in astronomical data processing.
• * Extending the capture range of PR is crucial for efficient and reliable astronomical imaging.

Purpose of the Study:

• * To introduce and evaluate a geometrical phase retrieval (GPR) algorithm for enhancing JWST's PR capabilities.
• * To extend the capture range of normal phase retrieval (PR) on the JWST.
• * To potentially eliminate the need for lengthy, centroid-based image stacking processes.

Main Methods:

• * Application of a geometrical phase retrieval (GPR) algorithm to image stacking problems.
• * Utilization of computer simulations to determine the capture range of existing PR algorithms for JWST.
• * Conducting experiments with a scale optical model of the JWST to validate GPR effectiveness.

Main Results:

• * Computer simulations demonstrated that combining GPR with existing PR algorithms increases the capture range by over a factor of 10.
• * The enhanced PR method guarantees a 95% success rate for phase capture.
• * Experimental validation confirmed the GPR algorithm's effectiveness in both coherent and incoherent imaging scenarios using a JWST optical model.

Conclusions:

• * The geometrical phase retrieval (GPR) algorithm significantly improves the phase retrieval (PR) capture range for the James Webb Space Telescope (JWST).
• * GPR offers a more robust and efficient alternative to traditional centroid-based image stacking, reducing processing time.
• * The algorithm's demonstrated success in simulations and experiments highlights its potential for advancing astronomical data acquisition and analysis.