Printable View
This is something I thought up when I was still planning to use a premade red in my projector. It's to halve the beam with of a red diode laser.
I don't have my regular drawing tools with me but I managed to whip up a quick image of what I mean.
If you have a red with a 8x5 beam, you can make it a 4x5 beam :)
Edit : you could even use this to decrease divergence in one axis. Expand the axis by 2x and then reduce it back with this setup
Seems a Keplerian expander with a reversal in role would be less to adjust...How much loss in power do you report on this set up? I am assuming a 1/4 wave plate.Nice though.
I can't really comment on losses because I never got around to building it, but with good mirrors and a properly polarised diode, you should easily get 90% of your power onto 50% of the original surface area.
Also, you would only need fine adjustment on the last mirror and the PBS
EDIT:
I've just realised that you can eliminate the need for a third mirror, see attachement
This works well, but its old news and was patented a long time ago.Quote:
Originally Posted by FourDee
Damn it :D
I had already filled in the patent forms :)
Yeah, back to the drawing board. Again ;)Quote:
Originally Posted by FourDee
I am not sure about past patents. Pit, if you know it is patented, please give the patent number or the Assignee name so I can look it up.
In any event, I have seen this very thing done pretty recently in lightshow projectors.
Bill
I'll see if I can dig it out, it's an old one but I have definitely seen it...