Abstract
We explain a technique that extracts both the structure and the
modal weights of spatial modes of lasers by analyzing the spatial
coherence of the beam. This is the first time, to our knowledge,
that an experimental method is being used to measure arbitrary forms of
the spatial modes. We applied this method to an edge-emitting
Fabry–Perot semiconductor laser with a stripe width of 5 µm
and extracted fundamental and first-order lateral modes with relative
power weights of 96.2% and 3.8%. There was a single transverse
mode.
© 2000 Optical Society of America
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