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Proceedings Paper

Wavelength-independent laser beam shaping
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Paper Abstract

This paper presents a beam shaping device namely, a Diffractive Optical Element (DOE), which is used to change a beam having a Gaussian intensity profile into a beam with a uniform intensity profile. The DOE used in this work was fabricated from ZnSe and its performance was evaluated using a cw CO2 laser. In most cases such elements are effective only at a specific design wavelength. However, in this paper we report on the design conditions which allow for wavelength independent elements. It was found that the DOE was able to successfully transform a Gaussian beam into a flattop beam for four different wavelengths in the range 9.2 μm to 10.6 μm. We also present experimental results on misalignment effects and it was found that small radial offsets of the incident beam on the DOE had a significant disruptive effect on the flattop beam profile.

Paper Details

Date Published: 16 August 2010
PDF: 9 pages
Proc. SPIE 7789, Laser Beam Shaping XI, 778904 (16 August 2010); doi: 10.1117/12.862922
Show Author Affiliations
Mapule P. Degama, Council for Scientific and Industrial Research (South Africa)
Univ. of KwaZulu-Natal (South Africa)
Andrew Forbes, Council for Scientific and Industrial Research (South Africa)
Univ. of KwaZulu-Natal (South Africa)
Stellenbosch Univ. (South Africa)


Published in SPIE Proceedings Vol. 7789:
Laser Beam Shaping XI
Andrew Forbes; Todd E. Lizotte, Editor(s)

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