Mitsubishi ML520G71...Red Holy Grail or Flashlight Fail ??

[kiyoukan]

I will start another thread with pictures and more details on the dual build.
i built it and taken it apart 3 times now.
also here is a link some of you may not want to read.
http://laserpointerforums.com/f50/de...age-71241.html
http://laserpointerforums.com/f49/cu...ses-71286.html
So hopefully monday i will have everything back together again to post.
The setup is rather large, 150mm length by about 127mm wide.

[steve-o]

here is a link some of you may not want to read.

LOL


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[kiyoukan]

Okay so a pain in the ass moment.
The diode i de canned is now near death.
I did some inspection of the diode and it seems i damaged about 60% of the right side of the emitter.
I noticed the beam had was lacking wings and the even power it had before so i took a look and sure enough its damaged.
I have on on its way from DTR he said he had them in stock so it should be here by Friday.
But i have all the lenses in place and am loving it so far.
Cant wait to sell all my old pointer stuff and so i can order some cool new things.

[steve-o]

.. from another (hi-jacked) thread

Badger wrote:
hey steve-o a dual mitsu 300mw 638 diodes cranked up to 500mw each ,and they been at 2 days cw test, and 36hrs scanning
and all good ,roll on the 50mw diodes

Is this the 520G71 badger? And you have had some luck taming it.. using lava or cyl lenses or not .. pix? ..

[kiyoukan]

So i have gotten 1W of 635nm.
Or well very close.
But i have ran into a road block.

The problem is aligning that beam on such small surface is freaking driving me crazy.
Even after hours of adjustments the best beam i got was 6mm wide
Far from the 4mm i was willing to accept.
I cant even begin to tell you the feather adjustments i was making were to large sometimes.
So i have kind given up and knife edging inside the correction optics.
But i still have a solution.
Stack vertically before the correction optics. this will get you the beam of 4mm by 4mm.
So the question now is how do we do a quad.
Well 2 dual setups with a pbs cube and waveplate.
Now you can try to save money by using the cube and plate inside the correction optics so they share the same large c lens.
and the fact that they will overlap will make the beam just the same.
But if you do this make sure to do it with the beams crossing at a bigger point.
in my setups you see them crossing at 10mm away from the first lens i would set it up about 30mm that way it would be much easier to align to the cube with a beam of a decent size.
So a dual build is still possible with a very similar price tag, a quad is still possible with the added waveplate and cube.
A 8 build would not work.
Now you could try to cut cost even more in the quad via stacking then using the wave plate and sending the other stack threw the same 2 c lenses however there is a limited amount of space between the first c lens and the diode.
If you go beyond 30mm the beam will come out larger than 4.5mm so you would need to be able to fit the waveplate and cube and knife stack all before that c lens.
It might not be worth the cost saving for the as it will make it even harder to align.

[badger1666]

hey steve-o
mysetup is as earlier in this thread just tweeked abit to 1.14w for the pair, just over 700ma each i think , will check tomorrow

.. from another (hi-jacked) thread



Is this the 520G71 badger? And you have had some luck taming it.. using lava or cyl lenses or not .. pix? ..

[dilbert]

I spent a day at the last uklem rebuilding my red with different combinations of lenses etc and finally got the perfect 1mm x 4mm beam to match my blue.. Fantastic divergence too, perfect match, biggest and most important change was switching from 405g2's to brass inserts holding the 2mm lenses. Easy to align and PBS tiny beam too. You could knife edge very easy with this lens.

[steve-o]

I've been fiddling w/ the lavalens setup today, getting 5x5mm at the ap (which is ok for me) and a very reasonable 430mw output at just over 800mA with no issues as of yet but the dot on the tree looks huge (see pic). I'll have to go measure the size of it and figure the divergence in a bit.
Thanks badger, I'll try to go find the page. This thread (40 pages) is absolutely out-of-control lol.
Dilbert, sounds like youve got a good handle on it .. care to share some pix?

[kiyoukan]

steve what is your power before optics?
you should be getting alot more power at 800ma.
Unless you lenses are dirty or you got a low % diode.
I know mine at 749ma are getting just around 500mw raw.
I tested mine again after cleaning the mirror off and got just about 1.08w.
So that mirror can knock off a good bit of power but that was known and now with my new setup of stacking prior to correction optics i should be able to get the same power as im not changing anything but the placement.
And with the mirror going to be knife edging about 10mm from the diode lens the mirror should not be as effected by dust.
I hope to get a stable 1W red at current of 750ma with it TE cooled to 15C/ 60f.

[steve-o]

Yeah all my optics seem to be dust-magnets :] I don't have a mirror (?) I have only the laser diode, colimation lens and the Lava lenses in this test-setup. I'll measure the raw output right after pizza.. (it's done) ..