Further investigation on the phase stitching and system errors in digital holography

Area of Science:

• Optics and Photonics
• Metrology
• Digital Holography

Background:

• Phase stitching in digital holography (DH) is crucial for reconstructing large objects.
• Existing methods face challenges with phase errors and coordinate system misalignment.
• Accurate measurement of microstructures requires robust stitching algorithms.

Purpose of the Study:

• To develop an improved phase stitching algorithm for digital holography.
• To introduce a reliable image-based method for correcting relative rotation errors.
• To validate the proposed methods for measuring large microstructure elements.

Main Methods:

• A novel phase stitching algorithm based on a deduced phase errors model and global optimization.
• An image-based correction method to address relative rotation errors between CCD and motion stages.
• Experimental comparison with existing phase stitching techniques.

Main Results:

• The proposed phase stitching algorithm effectively reduces phase errors.
• The image-based correction method accurately compensates for rotational misalignment.
• Experimental validation demonstrates robust and valid measurements of large microstructure elements.
• The new methods show superior performance compared to existing approaches.

Conclusions:

• The improved phase stitching algorithm and image-based correction method offer significant advancements in digital holography.
• These techniques provide a robust and valid solution for measuring large microstructure elements.
• This work presents novel contributions to the field of digital holography not previously discussed.