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Old 01-16-2012, 10:10 PM #1
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Default low efficiency A140 diodes

I have a small problem, some/most A140 diodes I have seem to be a bit inefficient. I picked two average diodes and put them in a knife edge setup and I only get 2.5W at 1.6A, dropping of fast to something like 2.4W and below as it heats up. Running ti at 1.7 or 1.8A hardly gets more output of the diodes. I'm using the original lenses from the projector. The beams reflect of a single mirror, this is probably a ~13% loss, but that doesn't explain all te loss. I expected to more out of these diodes.

A while back I even killed a diode around 1.8A (LED'ed), supposedly an efficient diode. Anyone an idea what's happening or am I just overestimating these diodes? I see a lot of high power builds, nearly all with higher efficiency than mine My diodes are properly heatsinked so that shouldn't be the problem. I don't use the popular 405-G-1 lens, but in this thread the original lens actually performed well. Any one got an idea about this?


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Old 01-17-2012, 12:07 AM #2
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Default Re: low efficiency A140 diodes

I think you might just be overestimating them a little bit. The A-140's aren't meant to be run at 1.8A.
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Old 01-17-2012, 12:13 AM #3
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Default Re: low efficiency A140 diodes

i think you want the new M series ones.
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Old 01-17-2012, 12:20 AM #4
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Default Re: low efficiency A140 diodes

All the new 2W+ builds are using the M series diodes.

That's why now all of a sudden 2.1W+ is no longer such a rarity, and some folks have hit ridiculous high numbers with them.

Edit: A ton of testing has been done on A series diodes, I remember seeing a very nicely detailed thread with efficiency distribution. I was very surprised by the huge gap between the 2-3 highly efficient diodes in a projector vs the least efficient ones. IIRC the difference was over 30%.

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Old 01-17-2012, 12:45 AM #5
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Default Re: low efficiency A140 diodes

Quote:
Originally Posted by InfinitusEquitas View Post
All the new 2W+ builds are using the M series diodes.

That's why now all of a sudden 2.1W+ is no longer such a rarity, and some folks have hit ridiculous high numbers with them.

Edit: A ton of testing has been done on A series diodes, I remember seeing a very nicely detailed thread with efficiency distribution. I was very surprised by the huge gap between the 2-3 highly efficient diodes in a projector vs the least efficient ones. IIRC the difference was over 30%.
QFT. If you want to safely run diodes at 1.7A you need the M-140 diodes. Even for the most efficient A-140's 1.7A is pushing it. I think that when you say "I see a lot of high power builds, nearly all with higher efficiency than mine" that you're actually looking at reports for M-140 diodes. For example this is an efficiency plot for my M-140.

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Laserglow- 532nm lab 2,500mW output= 2,573mW
Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
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Old 01-17-2012, 01:32 AM #6
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Default Re: low efficiency A140 diodes

It sounds like you are over estimating the "A" series diodes and maybe confusing them with the "M" series that are making the 2000mW+ builds.

You stated you even blew out a High Efficient diode @ 1800ma how are you coming up with that it was a high efficient diode ?? was it a "A" or "M" series ??
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Old 01-17-2012, 01:54 AM #7
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Default Re: low efficiency A140 diodes

Honestly, this sounds par for the course.

At 1.6A, I'd expect around 1.4W from an average A140, if going through a glass 3-element lens. So double that, and subtract 13% -

(1.4 X 2) * .87 = 2.4W

Yep, right on target (and I didn't plan the numbers that way )
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Old 01-17-2012, 02:07 AM #8
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Default Re: low efficiency A140 diodes

Quote:
Originally Posted by rhd View Post
Honestly, this sounds par for the course.

At 1.6A, I'd expect around 1.4W from an average A140, if going through a glass 3-element lens. So double that, and subtract 13% -

(1.4 X 2) * .87 = 2.4W

Yep, right on target (and I didn't plan the numbers that way )
Was thinking the same thing. I have seen A140's that will give 1W @ 1.5A and ones that will give 1.6W with the same using a three element lens. That is a huge swing but smack dab in the middle the average is about 1.3W so 2.6W minus any loss from using the stock projector lens and any other optics puts his unit pretty close to par.
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Old 01-17-2012, 09:42 AM #9
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Default Re: low efficiency A140 diodes

At least nothing weird is going on. I looked at a compilation of data in some other topic and most people for 1W around 1.1A, so I figured I could do better at a higher current. I expected differences, but not 1 to 1.6W at 1.5A. Anyway, I'm letting my diodes run safey around ~1.45A getting a 2.2W out.

The high power builds I mentioned were before the M140 btw.

edit: spread rep before bla bla bla
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Big Sky Er:YAG - HP 8168D 1480-1570nm tunable laser source - Spectra Physics 3800 modelocked Nd:YAG - lots of IR diodes and bars - LPC-815 200mW 650nm - DL 6353TL 635nm 5mW - HP5501A stabilized HeNe - 2x Melles Griot 05-STP-910 stabilized HeNe - Spectra Physics 3500 Dye laser - REO 30536 543nm 2mW - Coherent DPY315-100 532nm 100mW SLM DPSS - Lexel 85 - 3x B&W tek 10mW 473nm - 445nm 3W Bluefan Sabre module - SF-AW210 150mW 405nm - DPSS inc 355nm 100mW Q-switched

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Laser precision RkP-575 w/ RK-5710 - Ophir 10A-V2-SH - Ophir OEM 20C-A - HP 8152A w/ 2x 81521B - Coherent 212 - Anritsu ML93 w/ MA98A - 2x laser precision AM-400 - Leader LPM-8000


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