STAND AND DELIVER!!! 2 Watts of Red….Out of the Optics Bed!!!

Since the ML520G71 thread has grown rather large... and now seems to be encompassing different LD options…I thought I would refocus with this thread. I believe that several members are in search of the 635nm to 640nm line... with an output of 500mW to 3Watts. This is just a SWAG. My personal goal is about 2 Watts of red...prior to propagation into the scanner head. I do NOT care if the beam comes out of Beelzebub’s Butt !! I WANT two (2) Watts of RED !!

Currently… in the running are: ML520G71, ML501P73 or the Opnext HL6388MG.

With the new lower price of the HL6388MG…and the emitter size being 20uM…perhaps a multi-diode…six (6) LD design would be optimal using the Opnext HL6388MG. Because there would be three (3) beams stacked after the knife edges….To beam correct I would lean toward the use of Anamorphic Prisms. A set of A-prisms after each group of three (3) LD’s . The LD’s would require a slight overdrive…rated at 250mW…driven to 300mW each. Therefore…300mW x 6 = 1800mW (Thanx Steve )

The other option might be a Quad of ML501P73. These diodes could be driven within spec…or 500mW x 4 = 2000mW.

See both concept drawings. As of this time…I am guessing that there will be acceptable beam correction optic solutions available. I just throw this out there because these seem to be the most promising directions….at least for multi-diode designs.

BEAM

Just curious why your using a waveplate rather than just turning 1/2 the diodes 90 degrees?

Probably because the beams come out of the diodes like this || and turned they'd be like this __ __ ? Just a guess..

if you rotate one set of diodes you end result will look like a cross +

use a waveplate and your end result will be - so you get a better beam

Yes, To eliminate the need for a waveplate…one would need to rotate ½ of the set up ( 3 LD’S ) 90 degree…not just the LD’s…but the knife edge and A-Prism beam correction optics also…the whole set up…then the rotated pair would enter the PBS like = and combine with the other pair to deliver something like this # This is what Swamidog does with his 445 Dual. My thinking is that a higher energy density is produced by adding ll + ll to produce a ll geometry, and that would deliver superior apparent luminosity… but…perhaps a # would produce a better result ?? Until I experiment or see the results of others….I do not really know !! I suppose I take my lead from the Kvant Multi-diode design. Comments ???

Beam

keep it simple is the best way

http://www.photonlexicon.com/forums/...iode-445-build

I have been following the ML520G71 thread closely as I want to build a 2W red in the near future too!

The ML501P73 looks interesting. The price doesn't seem too bad either. Has anyone found a set of optics that work well with it? I did a quick search but didn't see anything conclusive.

Mike

in my build, the "+" blended better with the size and shape of the red and green lasers i was combining with. i would recommend a "#" instead of a "=" or a "||" so all axis of your projected spot have the same divergence.

dual 445 spot at 40':
Attachment 28438

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Originally Posted by CDBEAM

Yes, To eliminate the need for a waveplate…one would need to rotate ½ of the set up ( 3 LD’S ) 90 degree…not just the LD’s…but the knife edge and A-Prism beam correction optics also…the whole set up…then the rotated pair would enter the PBS like = and combine with the other pair to deliver something like this # This is what Swamidog does with his 445 Dual. My thinking is that a higher energy density is produced by adding ll + ll to produce a ll geometry, and that would deliver superior apparent luminosity… but…perhaps a # would produce a better result ?? Until I experiment or see the results of others….I do not really know !! I suppose I take my lead from the Kvant Multi-diode design. Comments ???

Beam

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You could use our tripple block for this setup, this block allready got a area for the prismpair

BlowFly...School is still out on what tames the ML series...Currently....I would like to see the combination of the Lasershowpart adjustable LD mount , with a short FL Collimation lens coupled to Cylinderical lens set with an eight (8) magnifacation.

Steve-O...What collimation lens did you you use with your HL6388MG set up to get 1.09 divergence ??? I know you only use one (1) prism.....that does leave the propagation path at an odd angle....but does reduce transmission losses some.

Andy_con...Kvant uses only telescope optics...right ?? To compress an array of beams down to one bundled beam...Would telescope optics be a superior solution vs Anamorphic prisms ????? What does Kvant use to beam correct astigmatic/elipitical LD output of the 445 or the 640 LD's ???

Swamidog... I truly desire a pattern of symetry at the target plane !!! and the + shape delivers that...one can see that in your pic....but...at the end of the day....which arrangment actually looks better....for beam shows or graphics ???? I think it is Density vs. a fuller/rounder beam shape. I remain undecided as to what gives the best look !!

Has anyone else experimented with the HL6388MG or with the Swamidog + layout ??

Thanx all for your comments. We ALL stand on each others shoulders in advancing the art and science !!!

BEAM