A modification in the analysis of a conventional laser beam spot size measurement method has been developed. The new analysis significantly decreases the uncertainty in the estimation of the beam-spot size. A conventional beam scanning approach was used in the measurement, but instead of differentiating the data and fitting the result to a Gaussian function, the data were fit to an analytical approximation to the complementary error function. As a result, fitted parameters were obtained that were consistent with the standard differentiation approach, but with considerably smaller uncertainty.
© 2006 Optical Society of America
Original Manuscript: April 26, 2006
Manuscript Accepted: May 25, 2006
G. Veshapidze, M. L. Trachy, M. H. Shah, and B. D. DePaola, "Reducing the uncertainty in laser beam size measurement with a scanning edge method," Appl. Opt. 45, 8197-8199 (2006)