NDLI: Center Off-Axis Tandem Microlens Arrays for Beam Homogenization

Content Provider	IEEE Xplore Digital Library
Author	Axiu Cao Hui Pang Jiazhou Wang Man Zhang Lifang Shi Qiling Deng
Copyright Year	2009
Abstract	Tandem microlens arrays are commonly used in many applications for the beam shaping of an arbitrary input intensity distribution into a top hat. Because of the periodic structure of the regular arrays, the output intensity distribution is modulated by equidistantly located sharp intensity peaks, which reduces the homogeneity of the beam. A new concept is proposed in this paper for tandem microlens arrays incorporating a center off-axis microlens array for the generation of an intensity far-field distribution with improved homogeneity under coherent illumination with the envelope of a top hat. The geometric centers of the sub-apertures are randomly offset by the light axis of the sub-lens in the array to break the periodicity. The influences of the various off-axis amounts on the homogeneity are discussed. The center off-axis microlens array has been fabricated, and the corresponding laser beam homogenizing experiment has been carried out. The results verify that a high homogeneity output intensity distribution can be achieved based on the presented method.
Starting Page	1
Ending Page	7
Page Count	7
File Size	848761
File Format	PDF
ISSN	19430655
Volume Number	7
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lenses Laser beams Microoptics Laser fusion Optical arrays Indexes Periodic structures Off-axis Beam Shaping Microlens array Homogenization off-axis Beam shaping microlens array homogenization
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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