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FrozenGate by Avery

Heruursciences diode grab bag thread

Yeah I got a bunch of 1 watt diodes, outputting a watt at around 1.2A, as well as 500mW diodes that need about 850mA
 





Has anyone got a c-mount grab bag ??

Mike

Mario -- I have one running at 505 mW with 850 mA drive.  It will go higher but efficiency drops all to hell.  My c-mounts don't work.

Update---- I placed an old green crystal set over this diode and am getting 5 mW of green :)
 
For anyone wanting to use an Aixiz style housing,  9 mm = 0.3543"   -- The 9mm diodes I received measure ~0.3525"  which is likely within mfg spec for these device housings.  
The nearest American standard drill is a letter "S"  which is 0.348"  otherwise, find a 9 mm drill or end mill.
The Meridith housing is quite forgiving for diode mounting.

Mike

The bad c-mounts I received are because of a misunderstanding I had with a post. No problems with Chris.
 
Hemlock Mike said:
Has anyone got a c-mount grab bag ??

Mike

Mario -- I have one running at 505 mW with 850 mA drive.  It will go higher but efficiency drops all to hell.  My c-mounts don't work.

Update---- I placed an old green crystal set over this diode and am getting 5 mW of green  :)
Click to expand...

I need to get some 9mm diode housings made so I can try out the two red diodes I got. The one that I thought died is actually a pulsed diode and is still lasing 8-)
 
I ordered a c-mount grab bag and an "electronic surprise" box - stay tuned :D

So my 9mm grab bag contained:

Lots of 808nm, several 1w+ (dim cherry red glow)

A few long wave IR (>850nm) with powers up to 1w (completely invisible, only way I knew it was lasing was a reading on my thermal power meter)

Two red diodes, one pulsed, second is untested until I can get a proper module to mount it in.

Definitely worth the money if you want some IR to mess with (and the chance of getting an interesting red diode)
 
MarioMaster said:
[quote author=Hemlock Mike link=1238120462/0#18 date=1238267772]Has anyone got a c-mount grab bag ??

Mike

Mario -- I have one running at 505 mW with 850 mA drive.  It will go higher but efficiency drops all to hell.  My c-mounts don't work.

Update---- I placed an old green crystal set over this diode and am getting 5 mW of green  :)
Click to expand...

I need to get some 9mm diode housings made so I can try out the two red diodes I got. The one that I thought died is actually a pulsed diode and is still lasing  8-)[/quote]



Hi how is the laser pulsed and if i get one in the grab bag Ive order is there any way to tell witch one it is if there's one in there.  

could you put a picture on here of the laser diode when you have got it pusling do you know the output power of it .
 
ionlaser555 said:
[quote author=MarioMaster link=1238120462/20#20 date=1238466870][quote author=Hemlock Mike link=1238120462/0#18 date=1238267772]Has anyone got a c-mount grab bag ??

Mike

Mario -- I have one running at 505 mW with 850 mA drive.  It will go higher but efficiency drops all to hell.  My c-mounts don't work.

Update---- I placed an old green crystal set over this diode and am getting 5 mW of green  :)
Click to expand...

I need to get some 9mm diode housings made so I can try out the two red diodes I got. The one that I thought died is actually a pulsed diode and is still lasing  8-)[/quote]



Hi how is the laser pulsed and if i get one in the grab bag Ive order is there any way to tell witch one it is  if there's one in there.  

could you put a picture on here of the laser diode when you have got it pusling do you know the output power of it .


[/quote]


The diode only lases for a few seconds at room temperature until it gets hot and the lasing goes away. If you used a pulsed driver with it, you could probably get a few watts out of it. Herrur also said they will run CW if cooled (like with a TEC)

The diodes don't really look any different, you just have to power them up and see :)
Here's one pic I have of it:
http://hosting02.imagecross.com/image-hosting-06/2102STA70408.JPG
 
thanks for the pic is that a open can t0-9 in the background are they high power infrared or are they red diodes
whtas the best was to cool T0-9


thanks
 
ionlaser555 said:
thanks for the pic is that a open can t0-9 in the background are they high power  infrared or are they red diodes
whtas the best was to cool T0-9


thanks
Click to expand...

Yeah the one in the pic is an open can (not sure if it was originally that way, or the can just popped off at some point)
That one happens to be just another IR diode, probably around a watt.

The best way to cool these diodes would be to get a meridith laser diode housing and attach a TEC to get the diode nice and cool :)


I've also received a few PMs from people asking how I sorted my diodes, so I'm going to paste my response here for anyone else that happens to be curious.

To start I basically had a fixed voltage power supply and some variable resistors to limit current at around 10mA, that way I could immediately sort out any visible diodes vs the IR.

Once I went through all of them I just got an LM317 driver and ramped up the current. I wasn't really interested in any low powered IR diodes, so if they burned out before reaching a few hundred mW on my power meter I just tossed them in the junk bin.

A camera should be able to tell you if they're lasing or not, but without a power meter it will be hard to sort them effectively. Especially since IR is mostly invisible and the longer wavelengths will be completely invisible. I got a few in my bag that didn't even have a dim red glow to them, yet read over a watt of output power on my power meter.

For ESD protection I'd recommend keeping the diodes in an anti-static bag until you're ready to use them, maybe a wrist strap if you have one. In my case I had a chunk of anti-static foam that I put the diodes in once they were tested good.
 
What range of wavelengths can I expect to find in the 9mm grab bag? With invisible radiation flashing about I want to be sure that I'm properly protected.



an "electronic surprise" box? That sounds like fun. ;D
 
T_Warne said:
What range of wavelengths can I expect to find in the 9mm grab bag? With invisible radiation flashing about I want to be sure that I'm properly protected.



an "electronic surprise" box? That sounds like fun. ;D
Click to expand...

635nm to 1550nm   ;)

Yes it will be interesting to see what I get in the mystery box  :P


Cyparagon said:
Is there any way of inferring the wavelength from the voltage drop?
Click to expand...

Not really, the red diodes have a bit higher forward voltage than the IR, but it's pretty easy to pick those out. Otherwise the IR diodes all have very similar voltages
 
So, will OD 2.5+ @ 850-1720nm be OK for the IR? I already have set of spectacles with OD 2+ @ 630-650nm ... is that enough for 1W of red? I have never dealt with anything that has this much power. To be honest, it frightens me a little bit. :-/  
 
You want an OD of >2.3 for dealing with powers of a watt. To find the OD you need take the log of the power reduction factor to get the light to 5mw or less

so, log( output power / 5 )
 
T_Warne said:
So, will OD 2.5+ @ 850-1720nm be OK for the IR? I already have set of spectacles with OD 2+ @ 630-650nm ... is that enough for 1W of red? I have never dealt with anything that has this much power. To be honest, it frightens me a little bit. :-/  
Click to expand...

While it is necessary to have goggles at these powers, the risk is diminished slightly if you're just testing the diodes without collimating the output. The raw output from laser diodes diverges so fast that retinal damage is unlikely from a direct hit unless your eyes are within 1-3" of the diode facet. The output of a laser diode can be compared to a badly focused and highly astigmatic flashlight.
 
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