[OpenSPIM] laser for openSPIM

[Emmanuel DUFOUR]

Hello
The laser parts listed in openSPIM are expensive (7000 euros).
Is there a way to get cheaper lasers work  ?
I've been trying to make a very small focus point with a cheap red laser
diode without success. I often see several points instead of one. And I
cant make the point(s) smaller than 0.1 mm .
But I dont know if it's because of the cheap lenses I use, or the aperture
that is too big, or the diode itself (transverse mode pattern ?).
So, what are the bare requirements for the laser in order to make it focus
to a size of about 10 um ?

Thanks for your help
Emmanuel DUFOUR
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