Design of highly efficient far-field beam shapers with irregular maskless microlens arrays

Area of Science:

• Optics and Photonics
• Micro-optics
• Optical Engineering

Background:

• Tandem microlens arrays are established for beam shaping and homogenization.
• Absorbing slides enable flexible intensity profile control but cause significant transmission loss.
• Existing methods limit overall system efficiency due to absorption.

Purpose of the Study:

• To present a more efficient micro-optical beam shaping method using maskless irregular microlens arrays (iMLAs).
• To develop absorption-free optical elements for enhanced system efficiency.
• To establish design rules for iMLAs, including stray-light suppression and tolerancing.

Main Methods:

• Development of maskless irregular microlens arrays (iMLAs).
• Design of absorption-free micro-optical elements.
• Modeling and tolerancing considering manufacturing imperfections.

Main Results:

• iMLAs provide an efficient alternative to absorbing slides for beam shaping.
• The proposed iMLAs are completely absorption-free, boosting system efficiency.
• Basic design rules for iMLAs, including stray-light suppression, have been established.

Conclusions:

• Maskless irregular microlens arrays (iMLAs) offer a significant advancement in micro-optical beam shaping.
• The absorption-free nature of iMLAs leads to higher overall system efficiency.
• Design considerations for practical implementation of iMLAs are provided.