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New purple laser isn't a dot

ixfd64

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I thought most 405 nm lasers were single-mode?
 

Hap

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Looks perfectly normal for a diode laser, at least as best I can tell from the image.

Hap, it's likely single mode but even then, you still don't get a perfectly round beam.
Why did you write my name diachi, I never posted here :crackup:

Yes, my 405 pointer looks fuzzy too :)

-Alex
 

Alaskan

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...Single mode diodes have a small, round(er) emitter, where multimode diodes have larger emitters... The geometry of the emitter has a lot to do with giving the square/rectangular beam the 1W+ diodes have

Our single mode diodes usually have an oval shaped dot, however it's round enough for us to call it round.
My PL520 output looks more square to me, but within that shape it does have a brighter oval shape.
 




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