Optics questions mosty PBS, and Dichros

Like most you I imagine, I've had an interest in making a RGB or RGV laser, I realize the simple solution to RGB is either a projector or White fusion, but I would like to see about making one smaller say within a 3" DIA heatsink.

As for the actual questions, I realize that with Dichros they allow some wavelengths to pass while reflecting others, my questions about dichros is, has anyone investigated how reflective or transmive the blue dichro is to 405, and the more important question that I have yet to find an answer for is, since the dichros need to be at 45 degrees, must they be parallel, or can they be at 90 degrees from one another?

As for PBS cubes, mostly curious about the ones from the PHR sleds, does anyone know if they are Polarized to pass RED both ways and reflect violet and blue, or are they polarized to pass any color one way and reflect the other?

Lastly the mirror in the PHR sleds, the one the redirects the beam to the disc and vise versa, does it only pass green both ways and reflect red/blue or can it pass green/blue or green/red while reflecting the other?

Kmor2004 said:

Like most you I imagine, I've had an interest in making a RGB or RGV laser, I realize the simple solution to RGB is either a projector or White fusion, but I would like to see about making one smaller say within a 3" DIA heatsink.

As for the actual questions, I realize that with Dichros they allow some wavelengths to pass while reflecting others, my questions about dichros is, has anyone investigated how reflective or transmive the blue dichro is to 405,

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experimentation is your friend.

Kmor2004 said:

and the more important question that I have yet to find an answer for is, since the dichros need to be at 45 degrees, must they be parallel, or can they be at 90 degrees from one another?

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they can be at whatever angle you want to reflect the beam at. I don't think I'm understanding this question. They are usually parallel because in the arrangement that keeps the build size reasonably small and logically arranged, both beams would need to reflect in the same direction.

Kmor2004 said:

As for PBS cubes, mostly curious about the ones from the PHR sleds, does anyone know if they are Polarized to pass RED both ways and reflect violet and blue, or are they polarized to pass any color one way and reflect the other?

Your second statement is the more correct. They are made to pass or reflect based on beam polarization alone. However, because of the way they make these prisms, the cubes are more efficient for some wavelengths than others.

Kmor2004 said:

Lastly the mirror in the PHR sleds, the one the redirects the beam to the disc and vise versa, does it only pass green both ways and reflect red/blue or can it pass green/blue or green/red while reflecting the other?

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I'd be inclined to think that since it was designed to reflect red, IR, and near-UV, that it would be more likely to pass green and reflect red and blue. Again, though, the best way is experimentation because you probably won't find a datasheet on these specific dichros' coatings.

You see that review of the Reke projector? Might be worth looking into.

I think a half-cylinder might make a good plane to mount the dichros and little square diode holders. Then you could sandwich it between two "half-cylinders" to soak up diode heat and stabilize the entire thing. Not an easy project wtihout a machine shop nearby, though, but sounds interesting!

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the pbs' in the phr sled are ridiculously small. and a scanner or white fusion is not the easy answer lol

the easy way is just 3 lasers, 2 dichros and mounts., try to put your weakest laser at the last dichro (if allowable.)

the easiest way is a low power set up so you don't have to worry about combining 2 reds.

if possible get all lasers in the same size modules/ heatsinks. this allows for easier alignment.

@Bshana the idea of the half cylinder sandwhich is what I plan on doing, and I have access to, and permission from the local High school vocation schools machine shop, (I attended there for electronics and am good aquantanes with the instrustors) plus I've been trying to learn some of the stuff during the senior class since there's only 4 students, and they have a CNC mil, that I was learning how to program in g-code today.

@chip, I figured if no-one had any experience with the questions I had I would try, just haven't gotten my PHR sled yet, also the Green module is 12mm DIA same as the aixiz ones, I actually plan to mount all 3 lasers and see how the beams travel, and machine out the path and then align the optics and adhere then in place.