~650mW 638 and 1.5W 445? How much?

[norty303]

Although telling myself I need no more lasers, I also find something nagging me to build 2 more this winter (see thread about a month or so back)

I will want around 600 to 700mW of 638 and around 1.5W of 445.

Simplicity is the key, so passive cooling and I'm not after super pencil beams, although some anamorphic correction on the blue might be good.

So, what is the most cost effective way to go with this?

445nm: Is it a single M140 diode in a Dave mount with prism pair and Flexmod? Or what is the driver of choice these days?

638nm: Is it a pair of G71 diodes with a cube or knife edge and prism pair? Same for the driver? I don't think I want to be getting into the optics issues and fringing associated with the P73 diodes, as I don't really need absolute power over the nicer beam characteristics of the lower power diode.

And before I get into the build process, does anyone knock out cost effective modules already that match these specs?

Usual suspects, andy_con and Edison, anyone else?

Cheers

[steve-o]

/.. I don't think I want to be getting into the optics issues and fringing associated with the P73 diodes, as I don't really need absolute power over the nicer beam characteristics of the lower power diode.

Are the beamspecs of the G71 really all that much better than the P73? I thought that was discussed to death on the famous "Grail" thread. Was there ever any confirmation / comparison of the emitter size of these 2 LDs ?

[norty303]

Well I seem the remember someone recently saying that getting 600 or 700mw out of a pair of diodes was possible and I don't think it was the 637 diodes. The reason given was that they were easier tamed. Maybe someone is driving the 638 diodes that hard successfully..?

[tonyaztec]

Adam,

My winter project is very similar to yours, what I'm doing is mounting 2 P73 diodes in Dave's mounts, stacked one above the other, mounting blocks on a 90 degree to each other, then an additional diode block from Dave further down the beam through a dichro so its now a red blue beam. Then through a set of Dave's corrective lenses, hopefully giving me around a watt and a half of each.

Merry Christmas

[norty303]

That sound interesting, I hadn't thought of a combined unit actually. Are the corrective lenses broadband coated and have the same effect on the beams?
I'm struggling to visualise the block stacking, do you mean the beams are stacked, or the mounting blocks themselves?

What driver are you planning on using?

[tonyaztec]

I don't Know, thou I do know dave say the corrective lenses are good for both, so should be, the diode blocks for the red will be in an L shape and one will have a 2mm shim to stack the beams on top of each other. a bit like
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[norty303]

Ah gotcha. I got it a bit after I wrote my last thread and my daughter stopped screaming at me in a distracting fashion

[tonyaztec]

I guess it will work, that's the fun part, I have built a quad with G71s and its awesome,

https://www.facebook.com/photo.php?v...type=3&theater

[norty303]

This was the thread I referred to earlier

http://www.photonlexicon.com/forums/...light=Red+cube

[tonyaztec]

The driver I was going to use will be Badpip quad driver, each diode having its own channel, from what I have seen, around 1.8 amp on the M140 and 800ma each for the P73s.

I have one driver, I must order a second.