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Absorption-free beam generated by a phase-engineered optical element
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DOI：10.1364/OL.34.001528.png)
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Phase engineering of an axicon's phase transmission function results in an exponential growth of an on-axis intensity of a diffraction-free or Bessel beam. We show that in a lossy medium obeying Beer's absorption law/exponential intensity decrease, a beam focused by such an optical element propagates with nearly constant intensity while preserving the quasi-diffraction-free property. Absorption-free beams may find applications in illumination, atmospheric propagation, biomedicine/light diffusion in live tissues, and other situations where light absorption hinders beam propagation. (C) 2009 Optical Society of America
Keyword:
AXICON
SUPERRESOLUTION
RESOLUTION
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3.3
论文数:
4.0W
被引数:
7.6W
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