Who's collimated what? (expert [experienced] advice needed pleez)
Hey Y'all-
Who out there (or in here, @ PL, as the case may be) has taken a bare diode and sucessfully collimated it into a usable beam for shows? I've ex
perimented and f
ound the whole process
to be
fairly frustrating but interesting and a good learning experience about optical principles and properties. The average 635nm diode I think is
8/31 degrees,
hows about a 5/39. This is what I waz thinking about buying.. small losses would be acceptible, but losing too much from 150 mW would be
very
disturbing
Any thoughts or advice?
Thanx,
Steve
-edit- typing got screwed up because evey time I typed a letter, it erased the one b4 it- this has happened be4 and I cant fig out what does it ..
Reply With Quote
) One is to collimate other is reverse telescope. Basically speaking if you put your telescope into collimation mode you will get a perfect dot at the end but very large exit beam. If you put your telescope into reverse telescope mode you will get a small exit beam but divergence will be bad if you didn't do it right. To successfully collimate for lasershows you will need largest galvo mirrors you can find and around 1.5x telescope in collimator mode.
. Responding your question I DID. First it took me a hard time to study and understanding what is divergence, astigmatism, axis and how they interact. When you say 40um 5/39 it almost match ML1468 from Modulight I've posted here: 
) So, the collimation of the 5 x 39 laser diode to the same divergence in both directions requires the focal length of the slow axis collimating lens to be 7,8 times larger than the focal length of the fast axis lens. The collimated beam is still elliptical and can be circularized using an anamorphic prism pair. either the major axis is compressed or the minor axis can be expanded to make a circular beam. In my case I've used two lenses and a pair of anamorphic prisms.
