The '520 ColorWars' Thread... Where it all began..

[kecked]

use a pbs cube to combine

[norty303]

With waveplates? Are DPSS 532 usually polarized and if not, would you lose half the power by doing so?

[-bart-]

Without waveplates.
There is no reason to rotate the polarization of the dpss, it has a round profile.
The polarization of the green diodes is not so strong; 1:20 VS 1:100 for dpss as I recall.


@ Mikkklll

The color locus plots you made assumes a CIE standard observer which represent an average human's chromatic response.
Projected graphics and beamshows are usually viewed in low light conditions, causing not photopic but mesopic vision.

Planckian plots can be useful but are not very accurate in this case, aside from other factors such as
-wavelength dependent scattering in haze.
-divergence and beamprofile matching.
-possible fluorescence of the projection surface

[buffo]

Are DPSS 532 usually polarized and if not, would you lose half the power by doing so?

Most DPSS greens are polarized, yes. My 1 watt CNI is rated for something like 500:1 (not that I believe it's really that good, mind you!). The issue is that the 520 nm direct diode greens may not be nearly as good when it comes to polarization. Still, it's something I've been meaning to try... (Gotta save up for one of those fancy new 520 nm diodes first!)

Is there an optical mfgr that can make a pass 532 and reflect 520 dichro? Edmunds? CVI? II-V? Melles Griot? *that* would be a game changer.

Semrock surely can. They made a custom dichro for us to mix 660 nm red with 635 nn red and we have members using it to mix 650 nm red with 642 nm red, even though according to the specs for the dichro that should be impossible.

The downside is that those dichros were around $170 a piece, and that was only because we ordered 10 of them. Custom dichros are expensive, but a good optical manufacturer can give you just about anything you want, assuming you can afford it.

Adam

[LightningStalker]

AHEM, so, as I was saying, I'm just trying to figure out weather the spiral pattern in my G2 lens is coming from the lens itself or from the lens barrel. The only thing I've managed to come up with so far is a small piece of rolled up black construction paper stuck into the lens barrel.

[depo]

ahem, so

wrong thread