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Old 03-27-2011, 07:49 PM #1
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Default $29 laser diode (not a diode bar) that is 10 Watts?!?

LD66 laser diode 9-11W 904 nm UNUSED on eBay.ca (item 250794987898 end time 30-Mar-11 05:41:45 EDT)

What am I missing here? What am I looking at?

It's "10W" yet the sticker says Class IIIB?


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Old 03-27-2011, 07:53 PM #2
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

Good Catch....

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Old 03-27-2011, 09:10 PM #3
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

The operative words are "Max peak"
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Old 03-27-2011, 09:18 PM #4
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

Sorry Cyparagon - I'm still struggling with this a bit -

Wouldn't the IIIb classification also be determined by the Max Peak power?

Perhaps I'm confused because I'm used to thinking about peak power as being pretty close to what the typical power of a laser is. IE, people will identify a laser as having a peak of 250mW, and an average of around 220mW, etc.

So are you saying that this laser diode might have a peak of 10W, but an average power output that would be down below the 500mW cutoff for a Class IIIb ?
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Old 03-27-2011, 09:28 PM #5
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

This probably has a CW power of <100mW. Pulsed diodes are pretty common, and can have high peak power, as this does. I've seen 70W peak diodes in a tiny package on Osram's site, if memory serves they didn't even have a metal can.
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Old 03-27-2011, 09:55 PM #6
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

Quote:
Originally Posted by Prototype View Post
This probably has a CW power of <100mW. Pulsed diodes are pretty common, and can have high peak power, as this does. I've seen 70W peak diodes in a tiny package on Osram's site, if memory serves they didn't even have a metal can.
I have seen one too on RS.
OSRAM Opto Semiconductors | Optoelektronik og displays | Optoelektronik | Laserdiode | Laserdioder |SPL LL90_3

The ebay listing is pretty vague, at least I can't tell what type it is.
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Old 03-27-2011, 10:06 PM #7
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

(The seller just added some new photos.)

Interesting, I love learning something new all the time If I can guess at what the danish translates into, I'm thinking:

Max faldetid 45ns
Maximum Rise Time 10ns

Means that the pulse can last for 10ns, and then the diode must rest for another 45ns before pulsing again?

If so, that would still seem pretty amazing in terms of effective power.
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Old 03-27-2011, 10:09 PM #8
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

One hint is it ain't a $29 diode. The buy it now (what the seller will most likely end up sellling for, go ahead and bid on it and watch the immediate bid bumps) is $100!
But that still does not explain the Class IIIb and a Power rating of "8-11W". Something real fishy here. And, a power jump of <100mW continuous to "8-11W" peak pulsed is a bit of a leap IMO. Something not right...
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Old 03-27-2011, 10:17 PM #9
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

It could be pulsed. I have a book that tells me how to build a ten watt pulsed laser with a 904nm diode and it's around the same price. That seems to be the most likely explanation.
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Old 03-27-2011, 10:20 PM #10
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

GUYS I just found the spec sheet for it.

LD66 Spec Sheets Details Diodes, Transistors, Thyristors, Triacs, Diode Array, Integrated Circuits and Semiconductors — Product Line

Radiant Power Output - Min (W) : 8.0ъ
@If (A) : 40
Wvlngth (Peak) : 904n
Spect. BW (m) : 7.0n

Read more: LD66 Spec Sheets Details Diodes, Transistors, Thyristors, Triacs, Diode Array, Integrated Circuits and Semiconductors — Product Line


Is that really 40 amps?
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Old 03-27-2011, 10:31 PM #11
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

rdh,
I think the
Quote:
Max faldetid 45ns
Maximum Rise Time 10ns
refers to how fast the power can ramp up and down under really fast pulsing.
(There are applications where it matters.)

I read the datasheet some months ago and got the CW effect to app. 7mW, quite fitting for a package that size.

Anyway this does not beat the fibre coupled 20W I have just bought.
SPECTRA PHYSICS 20W LASER DIODE FIBER COUPLED - eBay (item 150576166104 end time Apr-11-11 10:31:06 PDT)
Whether I will actually get it powered up in a handheld is a different issue.
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Old 03-27-2011, 11:15 PM #12
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

O.K. another stupid question: Does the Class IIIb sticker really mean anything since it is just the diode, not an assembled end product?? where is the key switch? How do you know what to believe? (o.k.,, three stupid questions. I told you guys, I'm a senile old fart)
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Old 03-27-2011, 11:40 PM #13
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

The Class sticker should be able to apply to just the diode, since the class ratings don't (to my knowledge) have any relation to stuff like the FDA requirements etc (and in fact predate them).

I would love to undertake something like the SPECTRA PHYSICS 20W, or a pulsed laser head build, but I don't even know where to start. The real deal killer - I don't have IR glasses yet.
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Old 03-27-2011, 11:52 PM #14
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

Did anyone notice that on that auticion the label on the dioide picture says made in 83'?
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Old 03-28-2011, 01:45 AM #15
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

I found a "pointer" datasheet that seems to use this diode. 10W for 200ns is 2J. They run it between 10Hz and 100Hz, which averages to 20W and 200W respectively. If you look at some of the MPE charts, you can see this is almost an acceptable level to shoot right in your eye, thus the 3B designation.
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Old 03-28-2011, 01:52 AM #16
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Default Re: $29 laser diode (not a diode bar) that is 10 Watts?!?

Lol, the minute your PDF loaded, I thought to myself:
"What on earth is THIS from? Must be that Amazing1 website I used to look at 15 years ago"...

Then I checked out the URL... WOW - I had no idea those guys were still around.
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