Hi guys,
I've seen a fair few pics of 'professional' white light projectors floating around now.....
One thing that is apparent from some of them is that the manufacturers have not taken into account the different divergences and beam sizes of each colour...
In experimenting with mixing our arctos red and lambdapro green, it was horribly obvious that the green laser had a much smaller beam (with higher divergence - the green caught up to the red at about 13 metres away from the lasers)
I believe all thats really required to fix this is a couple of lenses to expand the green beam so that its divergence is lowered... however thorlabs charge US$500 for a beam expander, hb-laser charge a few hundred euro for one...
does anybody know of a cheap, easy, reliable way to provide adjustable expansion on an already collimated beam ? Do u have any sources/manufacturers i should be checking out ?
Thanks,
Aijii