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Characteristics of Far Transported Laser Beam

Abstract

A beam propagating in free space or in a medium generally experiences diffraction, and hence it suffers an energy loss and an wavefront distortion. It Is essential for a stable and precise communication to eliminate or to minimize the diffraction effect accompanying on propagation. The diffraction-free beam is introduced for that purpose. A typical diffraction-free beam is the Bessel beam. The Bessel beam has, however, an infinite energy in the cross-section perpendicular to the direction of propagation and, because of this fact, its realizability is sceptical. To remedy this problem, a new beam is introduced, which has a series from with a Gaussian envelope function and tested for diffraction on propagation by a computer simulation. Compared with the Bessel-Gauss beam, this new beam shows much less diffraction. While, by using a scraper mirror in an Nd:YAG laser with a ring resonator, an annular output beam is obtained. This annular beam is focused by a Fourier Transformation lens to produce a diffraction-free beam. This diffraction-free beam dose not show any noticible diffraction on propagation over the distance of 16 m, which is determined by the scraper mirror and the Fourier transformation lens. This achievement provides a profound basis for the generation  More>>
Authors:
Park, Dae Yoon; Kim, Ki Sik; Lee, Seung Gol [1] 
  1. Inha University, Inchon (Korea, Republic of)
Publication Date:
Jul 01, 1997
Product Type:
Technical Report
Report Number:
KAERI-CM-130/96
Reference Number:
SCA: 426002; PA: KR-99:000239; SN: 99002059866
Resource Relation:
Other Information: PBD: Jul 1997
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; LASER BEAM MACHINING; LASERS; DIFFRACTION; ENERGY LOSSES; FOURIER TRANSFORMATION; OPTICAL FIBERS; MINIMIZATION
OSTI ID:
703573
Research Organizations:
Korea Atomic Energy Research Institute, Taejon (Korea, Republic of)
Country of Origin:
Korea, Republic of
Language:
Korean
Other Identifying Numbers:
Other: ON: DE99727815; TRN: KR9900239
Availability:
OSTI as DE99727815
Submitting Site:
KR
Size:
70 p.
Announcement Date:

Citation Formats

Park, Dae Yoon, Kim, Ki Sik, and Lee, Seung Gol. Characteristics of Far Transported Laser Beam. Korea, Republic of: N. p., 1997. Web.
Park, Dae Yoon, Kim, Ki Sik, & Lee, Seung Gol. Characteristics of Far Transported Laser Beam. Korea, Republic of.
Park, Dae Yoon, Kim, Ki Sik, and Lee, Seung Gol. 1997. "Characteristics of Far Transported Laser Beam." Korea, Republic of.
@misc{etde_703573,
title = {Characteristics of Far Transported Laser Beam}
author = {Park, Dae Yoon, Kim, Ki Sik, and Lee, Seung Gol}
abstractNote = {A beam propagating in free space or in a medium generally experiences diffraction, and hence it suffers an energy loss and an wavefront distortion. It Is essential for a stable and precise communication to eliminate or to minimize the diffraction effect accompanying on propagation. The diffraction-free beam is introduced for that purpose. A typical diffraction-free beam is the Bessel beam. The Bessel beam has, however, an infinite energy in the cross-section perpendicular to the direction of propagation and, because of this fact, its realizability is sceptical. To remedy this problem, a new beam is introduced, which has a series from with a Gaussian envelope function and tested for diffraction on propagation by a computer simulation. Compared with the Bessel-Gauss beam, this new beam shows much less diffraction. While, by using a scraper mirror in an Nd:YAG laser with a ring resonator, an annular output beam is obtained. This annular beam is focused by a Fourier Transformation lens to produce a diffraction-free beam. This diffraction-free beam dose not show any noticible diffraction on propagation over the distance of 16 m, which is determined by the scraper mirror and the Fourier transformation lens. This achievement provides a profound basis for the generation of diffraction-free beams over much longer distances. The developed technique will provide a stable and precise communication method in remote controlling system, remote sensing through atmosphere, and information transfer using the optical fiber. 30 refs., 22 figs. (author)}
place = {Korea, Republic of}
year = {1997}
month = {Jul}
}