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Proceedings Paper

Technique Using Axicons For Generating Flat Top Laser Beam Profiles
Author(s): V. K. Viswanathan; G. L. Woodfin; D. Stahl; J. P. Carpenter; G. Kyrala
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Paper Abstract

In certain fusion experiments using CO2 lasers, like Helios, it is desired to produce a focal spot several times larger than the nominal focal spot, with a flat beam profile. The typical focal spot in Helios is roughly 70 μm and just defocussing the beam produces beam breakup, with several hot spots with roughly the original diameter, and a gaussian distribution. A number of schemes were tried to achieve a large spot with desired characteristics. These are described in the article. Axicons were found to produce spots with desired characteristics. Axicons are lenses or mirrors having a cone-shaped surface. The various schemes are described, as well as an. experiment in Helios which confirmed that axicons produced the spots with desirable characteristics. Helios is an 8-beam CO2 laser which produces 10 kJ at power in excess of 20 TW. It is currently being used for Laser Fusion studies at the Los Alamos National Laboratory.

Paper Details

Date Published: 7 November 1983
PDF: 8 pages
Proc. SPIE 0380, Los Alamos Conf on Optics '83, (7 November 1983); doi: 10.1117/12.934773
Show Author Affiliations
V. K. Viswanathan, University of California (United States)
G. L. Woodfin, University of California (United States)
D. Stahl, University of California (United States)
J. P. Carpenter, University of California (United States)
G. Kyrala, University of California (United States)

Published in SPIE Proceedings Vol. 0380:
Los Alamos Conf on Optics '83
Robert S. McDowell; Susanne C. Stotlar, Editor(s)

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