Big Red Banger using 12 to 16 Opnext HL63133DG Diodes

[bolo]

Hi, I have a little problem with my mitsu... I cannot set it to "one" beam- on picture you can see my the best settings and spot after 7m.
Much easy to adjust is on anamorphic prism but beam is large ;/
I have fun with this from last four day, how to set up?

[badger1666]

You have it set up all wrong , i suggest you read this thread ( all of it ) http://www.photonlexicon.com/forums/...ght=Holy+grail
You will be needing additional parts , pbs cube and wavplate ,another set of cylinder lens
Those reds need to be stacked in pairs ,and then pbs/waveplate them together
And all distances for reds are critical also i would not try building a quad without using 2mm fl lens
And daves adjustable mounts
I built a quad p73 and the holy grail thread showed me how to get it right

[taggalucci]

Hi, I have a little problem with my mitsu... I cannot set it to "one" beam- on picture you can see my the best settings and spot after 7m.
Much easy to adjust is on anamorphic prism but beam is large ;/
I have fun with this from last four day, how to set up?

How did my thread about Opnext diodes turn into a "help me" thread on the Mitsubishi diodes???

[bolo]

Shot to admin- you have my agree for delate my post.

[badger1666]

curious as to what lens you use , not using a telescope ?

Hi taggalucci,

Your project sounds interesting,

I did the same 1 year and a half ago, a 16x module with 637nm single mode diodes.

I stacked the beams like you, for each polarization : 2 row by 4 columns

But for stability purpose, I installed 2 big TEC under the whole aluminium assembly (also easier to install).

Here are some pics, that might help you :

Picture of the inside, you'll notice that the wave plate and one diode were removed
Attachment 36902

Picture of the module. So I believe that you'll ask me : "the inertia of the module looks big". Yes, and this is what I was looking for .
Attachment 36901


All in all, this is the best configuration available for 16 diodes. 3*3 configuration (doing 18 diodes with H+V polarization) is too big to fit 5mm galvo...

You will see that there isn't telescope, as it isn't necessary.

[planters]

I was hoping if we could spend some time on the Mitsu diodes? I really like them, a lot.

But seriously, Bolo raises a good question that is diode independent and that is near field and far field alignment. Forget the telescopes and prisms for now and visualize what is happening when two diodes are co-aligned.
The knife edges are not used to bring the beams toward convergence because if they do then the beams are farther apart than they could be near field and will inevitably diverge away from each other as they progress away from the projector. The angle adjustment for the knife is only to adjust the beams to be parallel to each other while the POSITION of the knife edge determines where the two parallel beams lie relative to each other. First, adjust the diodes in their housings to be parallel and if say 2cm apart in the projector then they should be 2cm apart @ 5M. Then, intercept the beams with the knives. Fix one knife and slide the other carefully on the base plate while watching the far-field spots. It is OK here (for now) to overlap these spots. You will quickly see that there is a limit to how close you can place the movable knife in toward the first beam before you begin to shadow the first beam. This limit is at its lowest when the second diode is as close to the edge of its knife as it can be without light failing to strike the mirror.

A big help here is to project the whole array on a large mirror that is 1/2 the distance of your typical, anticipated projection distance when the projector is complete. The reflection from this mirror can be adjusted to strike a screen close to your projector so that as you make these adjustments you can see both the "far field" spots and what you are adjusting in the same field of view.


If additional optics are used they will be added and work best if this basic alignment is done first

[MIIKKKLLLL]

curious as to what lens you use , not using a telescope ?

I use lenses with 3.2mm focal length ; longer FL and beams can't pass through scanners mirrors (for 4.5-5mm beam), shorter and you obtain a too high divergence & lense centering problems.

[badger1666]

Where can i find 3.2mm fl lens ?
What divergence did you get ?
I see you also sell diodes please pm me price
Thanks

I use lenses with 3.2mm focal length ; longer FL and beams can't pass through scanners mirrors (for 4.5-5mm beam), shorter and you obtain a too high divergence & lense centering problems.