Abstract
Tolerance analysis shows that an efficient
M
2 measurement plan is a first cut
(beam diameter measurement) at 0.5–2.0 Rayleigh ranges to one side
of the waist, which is matched by interpolation between second and
third cuts to the opposite side. The waist is measured by a fourth
cut halfway between the matched diameters, yielding an easy
two-parameter curve fit for
M
2.
© 1998 Optical Society of America
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