20 Diode Modules

[Stoney3K]

So the 445nm LD just shift a little, is it possible to hit with them 455nm or even 460nm, if yes at what temperature do they need to be run, if possible. Also to let the Reds (660nm) run at 646, what temperatures are we talking about.

From 660nm down to 646nm you require a chill of about 70C (14nm / 0.2nm/K) and that would mean a temperature of about -45 to -55C, depending on your ambient temperature. Practical (and achieved in this thread) through a TEC cooling solution.

If you want to shift 445's UP in wavelength (a red shift), you will need to heat them up, and their amount of shift is so ridiculously small that it would mean heating them to a temperature where they would never be able to run reliably anymore.

The million dollar question is; what will be the combined pointing stability be after a few dozen thermal cycles from ambient to -30 and vice versa?

Nah, the million dollar question is, obviously, will it pop balloons, car tyres and the solid concrete wall behind them?

[LaNeK779]

And now some pics.

i hust have to re-post in this thread...

"and now some pics" he said casually and then dropped the most outrageously innovative laser module i've seen in PL

i am loosing my sleep with this one... and whenever i do manage to sleep i dream of little open cans with a bit of snow on them...

this thread is addictive. and i don't even want to imagine what this will turn into when it comes to life and starts sending out red little photons

[Stoney3K]

this thread is addictive. and i don't even want to imagine what this will turn into when it comes to life and starts sending out red little photons

I have to agree, this thing is downright insane. I'm curious how the LOC's turn out when chilled to perfection, if this thing runs as advertised, we may see some more water cooled, freezing quad LOC builds pop up in the future.

[allthatwhichis]

I just want to see the array going full blast.

[LaNeK779]

I just want to see the array going full blast.

"blast" literaly being the key word here!!

[absolom7691]

To get a 445 to lase at 450nm or even 455nm, would this still be a safe operationg temp or would this shorten the lifespan of the diode? For instance, running 500mW at 455nm...

[planters]

It just isn't realistic to consider any temperature tuning of these diodes. The wavelength shift is so small that you would literally cook the diode before you ever reached any visually detectable change in color or brightness. Sorry.

[allthatwhichis]

Sorry.

Dammit man... Can you eat the diode after they are cooked.

[absolom7691]

Damn. I do like the deep color of the 445s, but I have seen 457 and it is REALLY nice. Oh well.

[LaNeK779]

i am starting to cool down on this one and i now have the calm to look at the photos in more depth.

mr planters, would you consider changing the tubing of the waterblocks from daisy-chained to "parallel"? the way they are connected now, one waterblock will always receive water that has been "heated" by the first waterblock in the series. so, maybe it would be better to split the tube in two smaller diameter tubes and feed each block independently. well, i remember that you use chilled water so maybe it makes no real difference.

i would also urge you to experiment with flowrates, sometimes you get better results with lower flowrates as the cooling medium stays more time within the waterblock and absorbs more heat