Analytical model of a microlens array homogenizer based on an angular spectrum diffraction method

Area of Science:

• Optics and Photonics
• Optical Engineering

Background:

• Microlens array (MLA)-based homogenizers are crucial for light uniformity.
• Accurate design tools are needed to optimize homogenizer performance.
• Existing methods may lack precision in modeling diffusers and temporal effects.

Purpose of the Study:

• To develop and validate an angular spectrum method (ASM)-based toolkit for designing MLA-based homogenizers.
• To enhance the modeling of diffusers and temporal integration processes.
• To provide design guidelines for MLA-based homogenizers.

Main Methods:

• Development of an ASM-based toolkit for MLA homogenizer design.
• Implementation of a refined rotating diffuser model.
• Simulation of the temporal integration process using an intuitive algorithm.
• Experimental validation of the toolkit's practicality.

Main Results:

• The toolkit accurately simulates MLA-based homogenizer performance.
• Evaluation metrics like uniformity, speckle contrast, and flatness were analyzed.
• Design standards for MLA-based homogenizers were derived.
• The toolkit demonstrated flexibility for various optical systems.

Conclusions:

• The developed ASM-based toolkit enables flexible and precise design of MLA-based homogenizers.
• The toolkit's enhanced modeling improves the understanding of temporal integration.
• Derived design standards serve as a practical guide for engineers.
• The toolkit is applicable to other wavefront manipulation-based optical systems.