Reducing the uncertainty in laser beam size measurement with a scanning edge method.
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.
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J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506-2601, USA.
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