Creating unconventional geometric beams with large depth of field using double freeform-surface optics

We consider here creation of an unconventional flattop beam with a large depth of field by employing double freeform optical surfaces. The output beam is designed with continuous variations from the flattop to almost zero near the edges to resist the influence of diffraction on its propagation. We s...

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Bibliographic Details
Published in:Applied optics (2004) 2015-07, Vol.54 (20), p.6277-6281
Main Authors: Feng, Zexin, Froese, Brittany D, Huang, Chih-Yu, Ma, Donglin, Liang, Rongguang
Format: Article
Language:English
Subjects:
Beams (radiation)
Boundary conditions
Depth of field
Diamond machining
Diamonds
Diffraction
Optimization
Transport
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Summary:We consider here creation of an unconventional flattop beam with a large depth of field by employing double freeform optical surfaces. The output beam is designed with continuous variations from the flattop to almost zero near the edges to resist the influence of diffraction on its propagation. We solve this challenging problem by naturally incorporating an optimal transport map computation scheme for unconventional boundary conditions with a simultaneous point-by-point double surface construction procedure. We demonstrate experimentally the generation of a long-range propagated triangular beam through a plano-freeform lens pair fabricated by a diamond-tuning machine.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.006277