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Review: 510nm Direct Green Diodes / Build Photos (DGH-N1, DGH-N2)

sopark4000

sopark4000

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jcranmer said:
I have no idea how things work in your part of the world, but here in the US that is exactly what happens. :)

Bar owners can and do get sued because they served that drunk driver one too many before they left. I'm sure the same thing happens to Gun manufacturers as well.

The same would hold true for Lasers. It would just take one aircraft accident caused by some idot with a green pointer and we've have a multi million dollar lawsuit filed against the laser operator, the laser manufacturer, and heck even the battery manufacturer.

US law is very flawed on this subject and people need / want someone to blame so they go after the people with the deepest pockets rather then the party actually at fault.
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No gun manufacturer in the US has ever been held liable for a shooting with one of it's firearms. Corporate liability laws are MUCH different than laws regarding a bar tender serving a clearly drunk person. The chances of a company producing bare diodes being held liable for there use in a laser pointer are slim to none. The person/entity that actually built the laser could be held liable.
 
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qumefox

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Those are from the same source as rhd and aryntha got theirs from KGB. And laser66 is just measuring and binning them himself and marking up the high wavelength ones. They aren't binned from the source. You get whatever they have to send. The only guarantee is 'between 505nm and 520nm' There isn't any picking or choosing.

I'm just curious how much he's marking them up.. Since I know how much they are straight from the source.
 
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CDBEAM777

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Thank you Rhd and Aryntha for your pioneering work !! Exiciting times !! First was the " Ruby" Laser in the 1960's....Now....the " Emerald " Laser !!! ...PHOTOXICATION !!!!! BEAM
 
cheech226

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just want to thank you both for your devotion and hard work (along with lotsa fun) y'all put into our hobby. i can't wait to own one, the color is stunning.
and it's great to see tight beams specs with this diode after the "flood light" 635nm red's.
 
Lase

Lase

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qumefox said:
Those are from the same source as rhd and aryntha got theirs from KGB. And laser66 is just measuring and binning them himself and marking up the high wavelength ones. They aren't binned from the source. You get whatever they have to send. The only guarantee is 'between 505nm and 520nm' There isn't any picking or choosing.

I'm just curious how much he's marking them up.. Since I know how much they are straight from the source.
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I'm pretty sure Aryntha said they were around the same mark. So he's not marking them up too much I guess.

Lase
 
qumefox

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Depends on how many he's ordering. He's a business, so you know he's making money off it or he wouldn't be doing it.
 
sopark4000

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While I am definitely looking forward to the progress of direct green diodes I fear that they will only see use in several hundred dollar pico projectors which means we won't have a k@$10 type of situation where you can get a ton of diodes out of one product. My big hope is that a company will end up using direct greens in a full size projector like k@$10 did. OMG IMAGINE A FULL SIZED PROJECTOR FILLED WITH A BUNCH OF 445 DIODES AND DIRECT GREEN DIODES....... I think I just came.

Obviously there wouldn't be as many greens because of green being more visible but it would still be incredible
 
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qumefox

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It's unlikely Ka$i0 will do it because more than likely, their phosphor disc is a much cheaper way to make suitable green.. The direct green diodes would have to prove to be cheaper, and better than that method before they'd change the design. Most likely initial use will be limited to pico projectors.
 
sopark4000

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qumefox said:
It's unlikely Ka$i0 will do it because more than likely, their phosphor disc is a much cheaper way to make suitable green.. The direct green diodes would have to prove to be cheaper, and better than that method before they'd change the design. Most likely initial use will be limited to pico projectors.
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I have the feeling that within the next 2-4 years direct greens will be nearly as cheap as the 445's we get out of k@$10 projectors (but only if they are put into a projector). K@$10 may not be the company to do it but I can dream cant I? Either way within the 2-4 year time frame direct green technology can only do one thing and that is get better. I honestly didn't even think there would be any direct greens in a hobbyists hands for years but here we are. Obviously they're not widely available but you have to start somewhere.

One question I have is what are the other applications for direct green diodes other than projectors and pico projectors?
 
Wolfman29

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Well, as we all know, green laser pointers are getting more and more popular for presentations. My guess is that we'll easily see low-powered direct greens for presentation pointers.
 
benmwv

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Wolfman29 said:
Well, as we all know, green laser pointers are getting more and more popular for presentations. My guess is that we'll easily see low-powered direct greens for presentation pointers.
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This will almost definitely happen, but by the time it does I can guarantee we will have had easy access to the diodes for some years already.

Just think how long it took for 532 dpss to trickle from its time of invention down to the readily-available pointer you can buy at any radio shack. (I do realize dpss is more complex, but the point still remains)
 
Wolfman29

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Oh, certainly. I was just pointing out the obvious :p

Oh, further, most red laser pointers today are simply the die on a chip with a single resistor and the 3 button cells... that certainly won't happen with green diodes for a LONG time.
 
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Wolfman29

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Well, for now. These are still just "failed prototypes", essentially. I am sure the finished products would require a standard of... I dunno, 4V? It seems that the lower the wavelength, the more voltage is required, with blue being at 4.5V and red being at 3.5V, so green would probably be at around 4V. If my simplistic model of the technology works :p
 
rhd

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Red is a different material, so I don't think that comparison holds true.

Further, single mode blue requires higher voltage than multi mode - nearly 6 I believe. So I think it actually has more to do with emitter size/shape, and perhaps the efficiency of technology in each diode.
 
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