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Old 06-08-2012, 06:00 PM #17
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Default Re: single-mode and multi-mode laser diodes

Quote:
Originally Posted by ElektroFreak View Post
Generally speaking though, the oval produced by a singlemode diode is "close enough" to TEM00...
Wait I thought that multimode produced the oval beam, and the singlemode produced the circular beam.


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Old 06-08-2012, 06:06 PM #18
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Default Re: 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:


Multimode:


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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