Beam expansion?

[norty303]

I'm running 400mW 532nm and 1.1W 650nm and according to Chroma it should be reasonably well balanced. However, what I'm finding is that my yellows/oranges are terrible because the 1.1W of red is spread over a much larger beam area than the green, which leaves me with a very narrow orangish core in my fat red beam, rather than a decent beam of colour. Quite dissappointing really.

This was really hit home when I watched the vid of the 2W RGY elsewhere on this page which had a REALLY good orange/yellow. The poster (Pimmssomething or other I think) said that CNI had increased the divergence on the green and it looks to have had a good effect.

I'd like to do a similar thing, or even better, expand the beam of the green, rather than just increase the divergence. I don't need pencil thin beams as most venues I do are not that big that I need beams that sharp miles away, and it'll help the safety aspect too.

Can anyone advise how I might achieve this with lenses or otherwise?

Cheers

[allthatwhichis]

I think "Doc" did something to his red that may help yours... http://www.photonlexicon.com/forums/...Diverging-lens. This is not what you are asking for, but a possible solution none the less.

[carlos3621]

I'm running 400mW 532nm and 1.1W 650nm and according to Chroma it should be reasonably well balanced. However, what I'm finding is that my yellows/oranges are terrible because the 1.1W of red is spread over a much larger beam area than the green, which leaves me with a very narrow orangish core in my fat red beam, rather than a decent beam of colour. Quite dissappointing really.

This was really hit home when I watched the vid of the 2W RGY elsewhere on this page which had a REALLY good orange/yellow. The poster (Pimmssomething or other I think) said that CNI had increased the divergence on the green and it looks to have had a good effect.

I'd like to do a similar thing, or even better, expand the beam of the green, rather than just increase the divergence. I don't need pencil thin beams as most venues I do are not that big that I need beams that sharp miles away, and it'll help the safety aspect too.

Can anyone advise how I might achieve this with lenses or otherwise?

Cheers

Might help if you indicate what brand / type of lasers your using, some of the greens have an adjustable output lens?

[norty303]

They're both Laserwave heads of the same casing type.

See my rebuild thread for pics if you need them...

http://www.photonlexicon.com/forums/...m-Green-to-RGY

Rob Stanwax has already confirmed that the divergence can be altered on these, but suggested I may be better off expanding the beam rather than increasing the divergence, as diverging would make little difference in the nearfield. I think I'd rather expand the green rather than contract the red (as if you look at the pics, I might just get some optics in between the dichro mounts for the green, but I don't think I'd get anything in the red beam path, and not too much space for moving stuff around!)