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Proceedings Paper

Characterization of a clipped Gaussian beam
Author(s): Richard D. Jones; Thomas R. Scott
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Paper Abstract

We calculated irradiance distributions resulting from clipping a Gaussian beam with hard- edged slits transmitting 99 or 95 percent of the incident power. We determined the widths -- second moment (with 8- and 12-bit resolution), scanning slit, and knife-edge -- of these profiles at several distances from the source, both with and without a focusing lens. When using a lens, we had the option of determining the characterization parameters from two beam width measurements and one axial distance, or from a least-squares fit of several beam width measurements and axial distances. Characterization parameters determined by these two options can differ significantly, and under the conditions of this study, beam divergence is more accurately determined from a single beam width measurement than from a least-squares fit of several measurements. Finite resolution of irradiance, inherent in any measurement device, truncates integrals necessary for calculation of the second moment of irradiance distributions.

Paper Details

Date Published: 17 April 1995
PDF: 15 pages
Proc. SPIE 2375, Beam Control, Diagnostics, Standards, and Propagation, (17 April 1995); doi: 10.1117/12.206998
Show Author Affiliations
Richard D. Jones, National Institute of Standards and Technology (United States)
Thomas R. Scott, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 2375:
Beam Control, Diagnostics, Standards, and Propagation
Lindsay W. Austin; Adolf Giesen; Daniel H. Leslie, Editor(s)

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