ML520G72 diode properties

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09-07-2010, 17:46
drlava

ML520G72 diode properties

Got some testing time tonight for this diode.

Using the same lens 405-g-2 the red diode has 2.55 times the divergence of the 445nm diodes we've come to love. The 'beam' does look like a flashlight coming from the lens, in fact I have flashlights that are more collimated :) correction tests to follow..

update: Here are the results using a few lenses I had in stock:

405-g-2 (broadband coat, ~4mmfl): 400mA 239mW; 70mm wide beam at 26'

aixiz red lens (red coat, ~8mm fl): 400mA 176mW; 35mm beam at 26'
340mW @ 700mA (should be about 490mW)

laser66 'red' lens (red coat, ~8.x mm fl): 400mA 173mW; 34mm beam at 26'
244mW at 525mA

The losses, and the better divergence with the second two lenses are because of the longer focal length which also clips the fast axis.

The combination of one of the longer focal length lenses and the cylindrical correction optics in the group buy/kit will give a good beam, but clipping from the collimating lens will mean 30-35% losses will be necessary.

Given these results, it appears that PBS combining two 150mW 642's will cost just a little more, have much better divergence, and a little less visible brightness.

For beams, the combination of a 6mmFl lens and the cyl lens set from the group buy and in the module kits will extract most of the optical power from the diode and provide about 1.2mrad divergence, which isn't too bad.

In conclusion: with the right lenses these make good beamshow diodes however the 150mW 642nm diodes are the right choice for graphics and precision.
09-07-2010, 22:48
-bart-

Does anyone have the exact dimensions of the stripe.
That way we can simply calculate the best achievable theoretical beamspecs.
09-08-2010, 06:53
catalanjo

Quote:

Originally Posted by drlava

Got some testing time tonight for this diode.

In conclusion: with the right lenses these make good beamshow diodes however the 150mW 642nm diodes are the right choice for graphics and precision.

Which 150mw 642nm diodes are these? :confused:
Known source ? Price? Specs ? :confused:

Thanks *retardo

Cheers :)
09-08-2010, 07:26
allthatwhichis

..............
http://www.photonlexicon.com/forums/...chmentid=11674
09-08-2010, 13:24
mccarrot

Quote:

Originally Posted by drlava

.

For beams, the combination of a 6mmFl lens and the cyl lens set from the group buy and in the module kits will extract most of the optical power from the diode and provide about 1.2mrad divergence, which isn't too bad.

Thanks for sharing!

So with the FL8 lens you have about 30% loss due to clipping, the FL4 almost got no clipping, so can we say the FL6 lens got aprox 15% loss dus to clipping?

I would be very interested in a dual red setup with 2 x 500mW - 15% = 850mW with a 1,2 mRad beam *retardo

When can we order? ;)
09-08-2010, 20:31
drlava

yes that's right! however, there won't be any knife edging these babies for a dual that still fits on common scanners with those losses and 1.2mrad, you're going to have to use a PBS. and that means 2 sets of correction optics. :O
09-08-2010, 21:00
dave

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Quote:

Originally Posted by drlava

Given these results, it appears that PBS combining two 150mW 642's will cost just a little more, have much better divergence, and a little less visible brightness.
.

Or we do something like this with 640's ( or 637's )

:)
09-08-2010, 22:17
flecom

would you get less clipping from the prisms?

how about the 250mW 642nm diodes?
09-09-2010, 16:38
catalanjo

Quote:

Originally Posted by flecom

would you get less clipping from the prisms?

how about the 250mW 642nm diodes?

Which 250mw 643 diodes are these?
:confused:
Info pls :o

I NEED RED !!! :o

Thanks

Cheers :)
09-09-2010, 16:44
catalanjo

Quote:

Originally Posted by dave

Or we do something like this with 640's ( or 637's )

:)

Which 637s ???? :o

Cheers :)
09-09-2010, 16:45
dave

Quote:

Originally Posted by flecom

would you get less clipping from the prisms?

how about the 250mW 642nm diodes?

the clipping is happening because the na of the collimator is not up to the task, so a prism wouldn't make a difference. I think Simon P1t8ull tested the 250mw 642nm a while back and got pretty poor results.
09-09-2010, 22:41
p1t8ull

I have a couple of the Mitsubishi ML520G51's here which are the 150mW/640nm small emitter diodes with 7/40 degrees divergence. I tried various FL collimators from 3.6mm to 8mm on the diode with a set of prisms and also found the beam wasn't all that great with any of them. With prisms the losses were unacceptably high due to the severe angles needed to get the beam under any form of control as well, so no good IMHO.