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It's just because its for a University project where we have to design a pen like object with various functions, one of which is that it should have a laser pointer but I have to be able to justify sizes etc. I managed to find a laser diode module which was 4mm diameter by 8mm length so I would...

I'm looking for some information about the smallest laser pointers availiable, or more precisely the internal parts of the laser required to make your own. Its for a uni project which involves putting a laser pointer inside a pen like object but space is important so I need to find the smallest...