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New 9mm 445 diodes






K

kjd

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Blord said:
Another 9mm diode hits the 3W. As more data is available we see at least 2.2-2.3A is needed for that mark. It is pretty consistent.
But how comes that the diodes from Lazeerer dims at 2.1-2.2A ?
http://laserpointerforums.com/f65/new-9mm-445-diodes-73284-4.html#post1058928

Don't forget i do have mine TEC cooled, the heatsink temp was held at around 13 dregess C, is this would help to push a little more current through the diode. Actually left it running like that for more than half an hour, it was very stable o/p power did not change. Let me enjoy it for a while and then i might push it till it dim and see what power it makes. Maybe even lower the temp of the heatsink sink to 10 to 8 degress.
Click to expand...
 
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pullbangdead

pullbangdead

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Breaking a diode? No problem. Happens to everybody, all the time, move on.

You should try making the things and killing a few dozen lasers on-wafer with one tiny little slip of the tweezers. Done that plenty of times.

Or having a laser probed up and running when somebody bumps the table and kills row of devices.

Or killing hundreds of lasers all at once by screwing up a process on multiple wafers. A week of my life I'll never get back because of a 30 second mistake.

Killing one laser? No big deal at all.
 
millirad

millirad

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^ Or have a semiconductor equipment operator dump a half million dollars worth of wafers off the back of the table, while pushing the fresh batch of wafers onto the table.

No worry's that happened ages ago.

Keep up the momentum laserists! This is really getting interesting! :)
 
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tsteele93

tsteele93

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kjd said:
Managed also to get 3 watt out of the 9mm diode. But it is peltier cooled, heatsink at around 13 degrees C. Not sure what the final current was, but at the same distance about 2ft at 2.1amps 2.88watts. I just wound the current up till i hit the 3 watt mark!. At a guess i would say 2.2 to 2.3 amps
Click to expand...


kjd said:
Not really guessing the P3 driver puts out 100mA/turn of the trim pot, but yes you did make me measure it :). 2.267 Amps for 3 watts.
Click to expand...

That was a pretty good guess! :)
 
K

kjd

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DKlaser said:
I wonder how long it will hold at that current???
Click to expand...

I have had it working at level for a couple of hours now still good. Though i might increase the current even higher. Dropped the heatsink temp to 8 degrees. left it running for half an hour then took the photos.
 

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Blord

Blord

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This is crazy ! :eek:

2.67A on the diode with 3.3W output. Let try dry ice and LN setup. Maybe 4Watt is in reach. :D
 
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lazeerer

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kjd said:
I have had it working at level for a couple of hours now still good. Though i might increase the current even higher. Dropped the heatsink temp to 8 degrees. left it running for half an hour then took the photos.
Click to expand...


YOur Just asking for it there.:eek: You have the Tec on it that is the Only Reson it did not start to dim out completely but they signs are there.

You increase the Currant By nearly 400mA and dint get that much of a Increase. THose are signs of Dimming.

If you where to take the TEC off right now. I can Garranty you that diode will dime out and probebly LED.

If you look at my picutre:
4600e18c.jpg


Iam at 2.14A and getting that.

Your Nearly 500mA more and are Just Under. Thats a big difference.

I can tell you right now you better keep the tec on that thing.:p

With No Tec they start to dim around the 2.2A to 2.3A Mark. Maybe 2.4A....

With a Tec I notice they can take More HOWEVER it does not mean it is OK. You are Just Delaying it.

What i have tested and about 3 more people that tested they all said 2.3A...

Though Iam Considering a Re test for you guys with TEC.:thinking:

Very Interesting test. Thank You for posting that.!:beer:

Also as a Side Note. I killed a 9mm diode at 2.5A Not Chilled.


Edit:

@Kjd What was your voltage.?
 
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K

kjd

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lazeerer said:
YOur Just asking for it there.:eek: You have the Tec on it that is the Only Reson it did not start to dim out completely but they signs are there.

You increase the Currant By nearly 400mA and dint get that much of a Increase. THose are signs of Dimming.

If you where to take the TEC off right now. I can Garranty you that diode will dime out and probebly LED.

If you look at my picutre:
4600e18c.jpg


Iam at 2.14A and getting that.

Your Nearly 500mA more and are Just Under. Thats a big difference.

I can tell you right now you better keep the tec on that thing.:p

With No Tec they start to dim around the 2.2A to 2.3A Mark. Maybe 2.4A....

With a Tec I notice they can take More HOWEVER it does not mean it is OK. You are Just Delaying it.

What i have tested and about 3 more people that tested they all said 2.3A...

Though Iam Considering a Re test for you guys with TEC.:thinking:

Very Interesting test. Thank You for posting that.!:beer:

Also as a Side Note. I killed a 9mm diode at 2.5A Not Chilled.


Edit:

@Kjd What was your voltage.?
Click to expand...

Sorry i never measured it. I lent my other meter out. I do agree no TEC and diode would be dead!.

You do have one efficient diode there. I want one too :)

You are right from then on increasing the current more was useless as the rate of increase in output power of the diode was deceasing rapidly.
It just goes to show you Keep your diodes as cool as possible.
 
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kjd

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Though Iam Considering a Re test for you guys with TEC.

That would be interesting. Would not be surprised if you get close to 4 watts with that diode.
 
lazeerer

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kjd said:
Sorry i never measured it. I lent my other meter out. I do agree no TEC and diode would be dead!.

You do have one efficient diode there. I want one too :)

You are right from then on increasing the current more was useless as the rate of increase in output power of the diode was deceasing rapidly.
It just goes to show you Keep your diodes as cool as possible.
Click to expand...

It is very good that you pushed it though as it shows we have a little more room to play with.:beer: I was Concern to go Higher in fear of Death but it seems that these are a Little more Lenient just like the 5.6mm diodes.

How many Grams is your heatsink.?

I think you can get some better performance out of this laser of yours.

Ive noticed with a Tec that there is Point where Chilling any further does nothing.

I also noticed that there is A Big difference if you dont have the balance of Heatsink Vs Tec Cooling done Correctly. This can Change a Difference quit a lot.

If your Heatsink is too small you will get a Nice High Peak but a a Lower power stability output.

Which is what you want for a Handheld. IMO. "When I say High Peak I mean a Nice High Peak for a minute or two then it slow stabilizes."

If your in a Lab setup you want to have a Higher stability since you plain on running it for long hours. SO you want the laser to Ramp up to power.

Then there is Condensation you want to worry about.

You really dont have to worry about the diode. Though ill talk about that later.

Its the Lens that will start to get condensation on it. Which will fuzz up your output and kill your power.

This is a BIG Problem when you turn the unit down. You can Actually see it forming then after a few Minutes go away. It helps to make everything sealed up and remove any humidity from your module. If you cannot do this then having the lens separate from the Tec/Heatsink module will solve this as well but you will have power loss doing this since now you cannot use a Short FL lens.

I think we can get to 3.5W with these or around that. I dont see 4W. I mean to get 4W your going to need one doing 3.4W Normal at ~2.2A and i just dont see that.

But we never know.:D
 
lazeerer

lazeerer

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Hey Guys,

SO i could not resist my curiosity and wanted to see what these can truly take Chilled.!

This is a 9mm diode and was Putting out 2.8W at 2.2A No TEC.

At 1.85A it was Putting Out 2.5W.

Here is a Video I shot. To see what these can actually take on a TEC. I had the TEC running at 5C.

It Happens Quick..


3.14A At 5.4v and dint even LED. THe Bonding wires Broke.:eek:

However what I notices as I ran this test a few times but stopped at 2.8A I notice under TEC at 5C i see Little Drop in power. "Dimming"

Exactly what i was talking about above.^^^

If this was not Chilled and i did this you would see it actually dimming out then POP.!

Another one bits the Dust.:beer:
 
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K

kjd

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I think we can get to 3.5W with these or around that. I dont see 4W. I mean to get 4W your going to need one doing 3.4W Normal at ~2.2A and i just dont see that.

But we never know.:D[/QUOTE]

You are just about there 3.375 W @2.14Amp:)
 
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