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Old 09-20-2012, 12:03 AM #17
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Hmm... well maybe I missed something then. Wouldn't that mean it's not even possible to combine more than 2 beam though? I know people have though.


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Old 09-20-2012, 12:04 AM #18
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

you can stack them right ontop of each other with a knife edge mirror,
and once the beams diverge a little, you have 1 beam.
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Old 09-20-2012, 12:08 AM #19
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

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Originally Posted by justinjja View Post
you can stack them right ontop of each other with a knife edge mirror,
and once the beams diverge a little, you have 1 beam.
You cant "stack" the beams. The way knife edging works is you basically make the beam "wider". Imagine two beams right next to each other if you will.
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Old 09-20-2012, 12:11 AM #20
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Ya, I see the issue now. You can only put 2 beams through a PBS cube, and can't put those 2 beams through another. I don't know how I overlooked that. Looks like I'll need a bit of a redesign.

Now, would this design work on multicolor or do the same concepts apply?
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Old 09-20-2012, 12:17 AM #21
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

your design should still work w/ 2 knife edges...

and with multi color it will work fine.
You just use 2 Dicros out of a projector
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Old 09-20-2012, 12:18 AM #22
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

True. Well, couldn't you knife edge the one, and combine the first two?
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Old 09-20-2012, 12:25 AM #23
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Quote:
Originally Posted by Mrcrouse View Post
You should only need 2 PBS cubes. The first two modules are perpendicular to each other, and once combined, that beam will be perpendicular to the third module.
That wont work. A PBS cube takes two beams of opposite polarization and knits them into one. You can use a PBS cube only once when combining beams because once the beams pass through one cube the polarization wont be opposite of the next diode.

That's why I said this earlier

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Originally Posted by ARGLaser View Post
No mirrors? How will that work? If combining 3 diodes of the same wavelength you have to knife edge at some point.

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Originally Posted by Mrcrouse View Post
Hmm... well maybe I missed something then. Wouldn't that mean it's not even possible to combine more than 2 beam though? I know people have though.
You can combine them by knife edging, stacking them next to each other with mirrors. The downside is it makes the beam bigger, that's why I used a PBS.
Knife Edging
For different wavelengths you can combine them with dichroic mirrors which reflect one wavelength and allow another wavelength to pass through.


To be honest I think 3 diodes in a handheld is pushing it, the cost would be really high with more optics and another diode, the alignment would be a lot harder with knife edging 3 diodes together in a small area and I think 3 diodes is out of a lot of peoples comfort zone, especially for a 400$ host.
This does seem like a great idea for a RGB build though, dichros would be much more forgiving with alignment.

I think there would be more demand for a dual diode host, easier to assemble with a PBS or people can knife edge if they choose, less cost and there are JLSE's build and my build for people to use as reference.


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True. Well, couldn't you knife edge the one, and combine the first two?
Yup, that would work.

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Old 09-20-2012, 12:27 AM #24
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Hmm, well perhaps I'll change it down to 2 diode builds, but still keep the diodes perpendicular to each other. That should make it so the align is quite easy since the beams are already perpendicular. Thanks for the input, don't know how I missed this.
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Old 09-20-2012, 12:28 AM #25
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Like this:


In reality you would put them even closer together,
but my MS paint skills are not that good lol

Also if you combine 2 multimode diodes with a pbs
your beam that was a -, will now be a +
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Old 09-20-2012, 12:29 AM #26
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

I think Knife edging is the only way you are going to combine 3 beams of the same NM.

Now it would be very cool to put one green module in there with two 445 you could then use a dichroic mirror for green and a PBS cube for the two 445's

I think JayRob has the green module you are going to need for this one
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Old 09-20-2012, 12:29 AM #27
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Hmm... Would that work? It appears my knowledge of optics has become quite fussy since my last Physics Class.

Hahaha fair enough! Well I'm thinking of just doing 2 diode builds for now. Once comfortable with that, then maybe we can try to go for a 3. It probably would be a bitch to pack all those optics into that little area, and it'd be a really expensive build as well.
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Last edited by Mrcrouse; 09-20-2012 at 12:30 AM.
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Old 09-20-2012, 12:32 AM #28
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

dicro's require different color
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Old 09-20-2012, 12:33 AM #29
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Quote:
Originally Posted by Mrcrouse View Post
Hmm, well perhaps I'll change it down to 2 diode builds, but still keep the diodes perpendicular to each other. That should make it so the align is quite easy since the beams are already perpendicular. Thanks for the input, don't know how I missed this.
That sounds like a good idea Then there would only be a wave plate (easy) and a PBS cube to align. The lens' in the barrels would have to be perfect though, as small variations of the lens will change the beam direction if it's wobbly, and with a PBS cube it's not easy to do major changes on the y axis, but x axis adjustments are easy.

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Old 09-20-2012, 12:33 AM #30
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Okay. Well, would people be interested then in 2 diode kits that just incorporate a PBS? Would likely cost about half the price.

Is the wave plate really needed if the beams are already orthogonal?
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Old 09-20-2012, 12:37 AM #31
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

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Okay. Well, would people be interested then in 2 diode kits that just incorporate a PBS? Would likely cost about half the price.

Is the wave plate really needed if the beams are already orthogonal?
The wave plate is only needed for those who want to maintain a good beam profile.

The beams have to be oppositely polarized - and | to make a + dot. A wave plate changes the polarization but not the orientation of the multi mode beam so you can do | and | to get |.
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Old 09-20-2012, 12:40 AM #32
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Default Re: Feeler: 3 Diode 6W+ Host Kits! Updated Pictures Added!

Ahh I see. Makes sense. That just goes straight in front of the beam though. So with this design you can drop the FS mirror.
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