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Old 10-27-2011, 01:41 AM #17
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Default Re: 470nm diode

I believe I would have to order at least 100 units, and I don't currently have enough money sitting in my back pocket.


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Old 10-27-2011, 02:02 AM #18
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Default Re: 470nm diode

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Originally Posted by Ablaze View Post
I believe I would have to order at least 100 units, and I don't currently have $10k sitting in my back pocket.
He doesn't need to know that (yet). Find out more info about the diode and it's wavelength before you break the news that you're not Bill Gates
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Old 10-27-2011, 06:06 PM #19
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Default Re: 470nm diode

Here is the spec sheet he sent me: Google Docs

It is not DPSS, and max power is 80mw.

So basically.. no idea what the history may be on this thing..
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Old 10-27-2011, 06:11 PM #20
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Default Re: 470nm diode

Hmm, that's intriguing... maybe we should see if we could do a group buy?

EDIT: By the way, didn't mean to come off as arrogant and harsh the other day... wasn't having the best of days, so my apologies.

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Old 10-27-2011, 06:21 PM #21
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Default Re: 470nm diode

Tell him you need an engineering sample to verify the wavelength before you can commit to a bulk purchase.

If he says no to that, then it's BS.

If he says yes, make sure he will guarantee you the engineering sample cost refund if it isn't really 470nm.

End of story. Do that
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Old 10-27-2011, 06:38 PM #22
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Default Re: 470nm diode

I know pictures aren't always an accurate representation of the color, but those sure don't look like 470 to me. Price quote needed.
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Old 10-27-2011, 06:43 PM #23
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Default Re: 470nm diode

The problem with that story is that I don't actually have the equipment to verify the exact nm reading, nor can I afford the $500 to purchase said equipment.

I could look in to a group buy, do those things tend to work out well? It sounds to me like I would need to write up a contract.
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Old 10-27-2011, 06:50 PM #24
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Default Re: 470nm diode

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Originally Posted by Ablaze View Post
The problem with that story is that I don't actually have the equipment to verify the exact nm reading, nor can I afford the $500 to purchase said equipment.

I could look in to a group buy, do those things tend to work out well? It sounds to me like I would need to write up a contract.
A group buy would be a disaster at this stage.

The problem is that I'd peg the possibility of this actually being 470nm, at like 1% (seriously).

If you had better communication with this seller, and they were more forthcoming with information about the diode, then it would be a different story. But as it stands, a groupbuy would be a recipe for disaster.

That said, you don't need to have much equipment to spot a 470 from a 450. A $3 diffraction grating will tell you how far apart (roughly) they are. If that approach suggested that you might actually have a 470, then you'd take the step of sending it to someone reputable here who CAN test it.

If the first "sniff test" suggests that what you receive could be a 470, then there will be more than enough interest to get lots of help drummed up in more thoroughly testing it.

But again, don't do anything here based just on that DIY-spec sheet they tried to pass off as authoritative. You need more info, and you need to make it clear that you won't purchase anything from them unless you can test one unit first, and unless they give you additional information about HOW they know it's 470nm (like, for example, the diode name, etc).
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Old 10-27-2011, 06:59 PM #25
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Default Re: 470nm diode

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Originally Posted by Ablaze View Post
Here is the spec sheet he sent me: Google Docs

It is not DPSS, and max power is 80mw.

So basically.. no idea what the history may be on this thing..
Did I miss something? How do we know it is not DPSS? The module looks to be the size of a DPSS module and the "Tech Sheet" is looks like something he created himself as it does not look like a manufacturers data sheet which you can find with most didoes.

Either way would be an incredible price for 80mW of 473.
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Old 10-27-2011, 07:22 PM #26
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Default Re: 470nm diode

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Originally Posted by DTR View Post
Did I miss something? How do we know it is not DPSS? The module looks to be the size of a DPSS module and the "Tech Sheet" is looks like something he created himself as it does not look like a manufacturers data sheet which you can find with most didoes.

Either way would be an incredible price for 80mW of 473.
Well, here's a quote of the email I sent him:

"Hello ,T Ablaze ,

1) Is the diode exactly 470nm, or is it actually 473 nm?

Yes the 470nm diode is exactly 470nm ,no the same as 473nm

2) What is the technology, is it DPSS or Direct Drive?

Attached the specs for your ref , it's not DPSS .

3) What range of power can these be made at? Can they go up to 40mw? can they go higher?

We can make the max. power 80mW ."

It is his standard practice to charge more for higher mw rating. i.e. the 80 mw ones would cost more than $100 per unit.
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Old 10-27-2011, 07:29 PM #27
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Default Re: 470nm diode

80mW.Hmmmm

www.rayfoss.com

^^^ Im sure they are using the single mode OPNEXT diode. "Cant find Datasheet"

If it goes up to 80mW pretty sure its that diode.

Plus the spec are very close to the diode. Probebly changed it to hide the identity.

Ive seen that module in use before with red lasers on Eba. Let me see if i can find it.
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Old 10-27-2011, 07:44 PM #28
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Default Re: 470nm diode

^That's what it looks like to me as well. Replace "470" with "450" and everything else about this thread makes sense.

Quote:
Originally Posted by DTR View Post
Did I miss something? How do we know it is not DPSS?
We obviously can't know much of anything for sure without having one... but here is some evidence:

1) It wouldn't make sense to power the driver of a 2V pump diode with 7V. Even the lm317 is more efficient than that.
2) the spot size is too large to be DPSS
3) The color looks deeper blue
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Old 10-28-2011, 01:18 AM #29
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Default Re: 470nm diode

Judging by the way the color looks, I'm sure its 405nm. :/
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Old 10-28-2011, 01:35 AM #30
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Default Re: 470nm diode

One thing is catching me here, and I can't get past it - The beam shape.

It's perfectly round. I had an OSRAM blue (~450) singlemod, and I now have the Opnext blue (~450) singlemode as well. They both have a beam shape on par with multi-mode 445s. Rectangular. You can't get away from rectangular beams with any of the ~450nm diodes that I know to be out there.

The photo shows a perfectly circular output, which you're not going to see with any 450 at the output power shown in that photo, no matter what lenses you use.

So, the obvious explanation is that this is a 405. But that doesn't really make sense economics wise, unless this guy is just totally trying to rip someone off. 80mW of 405 is almost free - you're talking $10 NewWish pens, not $100 modules.

The photo colour is meaningless. Until VERY recently, all of my 445 photos looked completely violet.
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Old 10-28-2011, 02:40 AM #31
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Default Re: 470nm diode

I can certainly understand everyone's skepticism. No one here has any reason to trust "someone from China." However, I have had good and honest dealings with this guy in the past.

Perhaps I can get a sample. When I do I will be sure to send one to someone on here for verification.
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Old 10-28-2011, 02:42 AM #32
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Default Re: 470nm diode

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I can certainly understand everyone's skepticism. No one here has any reason to trust "someone from China." However, I have had good and honest dealings with this guy in the past.

I will be starting a Kickstarter campaign soon. If all goes well I will be able to get some of these diodes at the end of the campaign. Or perhaps I can get a sample sooner. When I do I will be sure to send one to someone on here for verification.
Be careful.

The only thing this diode looks like it could be, based on the beam shape, is an 80mW 405nm diode - which is worth about $10.

I'd love it if you found a 470nm diode for $100, but I've gotta say I think you're crazy if you order more than just one of these (for testing).
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405|441|450|467|473|495|505|520|532|556|PGLRG|589|594|632|638|660


SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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