Authors:
Ziqi Peng
and
Tatsuo Shiina
Affiliation:
Chiba University, Japan
Keyword(s):
Annular Beam, Non-diffractive Beam, Scattering, Random Media, Propagation.
Related
Ontology
Subjects/Areas/Topics:
Computational Optical Sensing and Imaging
;
Optics
;
Photonics, Optics and Laser Technology
Abstract:
Light is quite difficult to propagate a long distance in random media such as human tissue or atmospheric
dense cloud because of its scattering and absorption. For optical sensing, it is important to increase
propagation efficiency which means expanding the sensing range. An annular beam can transform its
waveform into a non-diffractive beam due to its propagation in a long distance. In our previous work, we
found the annular beam also had non-diffractive effect when it propagated in diluted milk solution of a few
tens centimetres at the concentration of less than 1%. In this study, to clear up how to control and optimize
the non-diffractive effect of the annular beam in random media, numerical calculation of propagation
characteristics of annular beam in air was estimated. The narrow annular beam with a small diameter would
generate a high intensity non-diffractive beam at a short distance. We also had three sets of experiments of
annular beam propagation in random media with the sa
me view point as the calculation, but its propagation
characteristics was evaluated by milk concentration. They showed the same variation of a non-diffractive
beam with the result of numerical calculation in air. These results provide us a hint of optimization for annular
beam propagation in random media.
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