http://www.youtube.com/watch?v=g9z5ioZhNjE

[logsquared]

Dave's drivers are very good. Been using them for a few months. No complaints. No dead diodes. (knock on wood)

One possibility would be to design a module that can house either RGB single modes for low power and super quality, or with the appearance of the 1W 520 diodes, could simply exchange diodes for high power and moderate, corrected multimode.

I am hoping I will be able to use the combiner I built for single modes with the 9mm 445, new greens and the 73. My hope is to use different FL collimators to get the SA divergence to be roughly equal then correct all 3 beams at once.

If this doesn't pan out I will add a area to put a negative lens after the collimator and before the dicro to adjust all the SA axis to be equal.

Problem still remains the 73 will have to be overdriven a lot to match the others

[planters]

hermal epoxied diode housings directly to a Peltier.. Doesn't the peltier device change dimensions slightly when in operation?

Yes, but over the small foot print of a diode mount/ base a problem doesn't seem to occur.

I am hoping I will be able to use the combiner I built for single modes with the 9mm 445, new greens and the 73. My hope is to use different FL collimators to get the SA divergence to be roughly equal then correct all 3 beams at once.

I think individual correction will be less of a headache. You might even need to go to an achromat/apochromat for a 200nm spread.

I can get 1.5W out of a cold P73. Drive the 445 to 2W and leave the 520 @1W. Not perfect, but imagine the foot print of this 4-5 W projector.

[steve-o]

I can get 1.5W out of a cold P73.

What current are you driving this diode? And at what temp? Thx.

[planters]

I am driving it @ 1.5A and -32C with a three stage TEC

[steve-o]

Ok , Thanks :]

15 char ...

[-bart-]

I think your voltage readings are off because you measure them -at- the lab power supply.
At these current levels voltagedrop acros the leads will introcuce error.
Add a second pair of leads to measure voltage -at- the diode.
Unless everyone does it this way, results can not be compared.

[planters]

Why do you assume this? I was mildly offended (I got over it) when you called my place a "kitchen lab". Sure, I do have a microwave (oven) in one corner or maybe your thinking of EL Bulli...?

I measure the delivered current initially with a Fluke load meter then confirm the current setting with a dummy load set to the resistance of the diode driven to its maximum power. I measure the V drop across the diode as you state independent of the current leads.

The voltage drop of these diodes is very close to 2.7 V at room temperature. This drop increases as the temperature drops and just exceeds 3.0 v @ LN2 temps. I have seen this and measured both values. My point about the rough number I posted was that if the W/A that we see were greatly different than the typical 0.8W/A for an AlGaAs junction then this cannot be attributed to an unseen series operation unless the V drop was an integer multiple of this number.

[polishedball]

Dave's driver has preformed perfect in my projectors. The beam suppression makes a huge difference.

Sorry for the OT.

Nice simple elegant solution. Question- thermal epoxied diode housings directly to a Peltier.. Doesn't the peltier device change dimensions slightly when in operation?
... Speaking of Dave, I believe he has drivers. Has anyone ordered any yet? Or are we waiting on a group buy.. ?

[polishedball]

Planters, have you ever charted the p73 performance output to a constant current as temperature is decreased?

Thanks.

[planters]

Yes, I have and I cover it in this video:

http://www.youtube.com/watch?v=z8EuZwgdqQ4