Comparison and evaluation of the laser beam-shaping techniques

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F13%3APU105621" target="_blank" >RIV/00216305:26220/13:PU105621 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1117/12.2023213" target="_blank" >http://dx.doi.org/10.1117/12.2023213</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1117/12.2023213" target="_blank" >10.1117/12.2023213</a>

Result language

angličtina

Original language name

Comparison and evaluation of the laser beam-shaping techniques

Original language description

Over the past several decades, free-space optical (FSO) systems have gained a specific place in the wireless technology area. The application of these systems is advantageous for high bandwidths, a license free band and quick installation. The main drawback of FSO systems is their dependence on the state of the atmosphere causing deterioration of the FSO systems availability. One of the atmospheric effects which has an essential impact on the performance of the FSO systems is atmospheric turbulence. Atmospheric turbulence leads to fluctuation of the optical intensity in the plane of the receiving aperture. It has been shown that to reduce the effect of atmospheric turbulence, uniform distribution of the optical intensity within the cross section of the beam in the plane of transmitting aperture (phenomenon of diffraction is neglected) and a suffciently large diameter of the circularly symmetric receiving aperture (to achieve aperture averaging effect) are needed. The main idea of our paper is the problem of beam shaping at the transmitter. In our contribution the technique of transformation of a Gaussian beam into a beam with uniform distribution of optical intensity is discussed. For the mentioned transformation we experimentally tested several shaping methods such as multi aperture beam integrators, diffractive diffusers, etc. Usage of laser sources with different degrees of coherence was considered. The purpose of these techniques is to create an optical beam with uniform distribution of optical intensity on the transmitter output. In order to compare and evaluate the particular shaping techniques, a new Trans- formation Complex Quality (TCQ) parameter was defined. The TCQ parameter indicates the optimal shaping technique and also evaluates the quality of the resulting transformed beam with respect to its resistance towards atmospheric turbulence.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

JA - Electronics and optoelectronics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2013

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

SPIE Proceedings Vol. 8874 Laser Communication and Propagation through the Atmosphere and Oceans II

ISBN

9780819497246

ISSN

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e-ISSN

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Number of pages

7

Pages from-to

1-7

Publisher name

SPIE

Place of publication

San Diego

Event location

San Diego

Event date

Aug 25, 2013

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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