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single-mode and multi-mode laser diodes






No. Single-mode produces an oval, multimode produces a line or a tight square cluster of spots depending on the type of diode.

Examples found randomly on the web:

Singlemode:
HL63603TG_2.jpg


Multimode:
31258d1295536594-correction-lens-445-nm-diode-laser-445nm-laser-diode-pattern.jpg


You can see that the multimode profile is both wider and flatter, but it is also made up of multiple hot areas, hence the name "multimode".
 
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