Resolution analysis of a digital holography system

Area of Science:

• Optics and Photonics
• Digital Imaging

Background:

• Conventional holography faces limitations.
• Digital holography (DH) offers advantages but has resolution constraints due to recording devices like CCDs.

Purpose of the Study:

• Investigate the interactions of three key factors limiting DH resolution.
• Provide a method for determining DH system resolution based on these factors.
• Analyze the influence of object extent on resolution in space-variant DH systems.

Main Methods:

• Analysis of pixel averaging effect within finite pixel detection size.
• Evaluation of finite CCD aperture size limitations.
• Investigation of sampling effects due to finite sampling intervals.
• Discussion of space-variant characteristics and object extent influences.

Main Results:

• Identified and analyzed three primary factors limiting DH resolution: pixel averaging, aperture size, and sampling.
• Established a framework for determining DH system resolution based on these parameters.
• Characterized domains where different factors dominate resolution and assessed their accuracy.
• Examined the impact of object size on resolution.
• Compared resolution performance for in-line and off-axis DH systems.

Conclusions:

• The resolution of a digital holography system is quantifiable and dependent on pixel averaging, aperture size, and sampling.
• Understanding these factors allows for optimized system design and performance evaluation.
• Practical examples demonstrate the application of resolution determination methods for real-world DH systems.