Pioneer BDR-205 12X Blu-Ray Burner

i think its COD, so the mirrored facet face of the die that melts or blows off.. i didnt know that bonding wire melt is the main killer of LOCs?

..that could turn out to become a killer for BR too, with the currents we reach now.. perhaps they used more bondingwires though? we dont know the normal current for LOCs nor BR..

manuel

Meatball said:

IgorT,

What is it the you believe kills a "diode" first?

Would you say its normally the dye connections? Those tiny wires that burn out on LOCs?

Or would you say its the dye itself?

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I'm not Igor, but on these diodes at high powers, COD is pretty likely. COD was one of the biggest problems in getting diodes to operate at these high powers in the first place. An article has already been linked (linked by Larry, maybe?) showing how they put a thin AlON interlayer between the semiconductor and dielectric mirror coatings on the facets. That's NOT a trivial process, but it's just one of the things they've had to do to make these things work at such high powers.

Meatball said:

IgorT,

What is it the you believe kills a "diode" first?

Would you say its normally the dye connections? Those tiny wires that burn out on LOCs?

Or would you say its the dye itself?

Click to expand...

I don't think those thin golden wires are a common cause of death among diodes.. Otherwise they'd go completelly dark, not just produce a weird blob..


The end facets can't handle the intense optical flux they are exposed to continuously. They degrade for a while, power slowly drops, and when enough damage accumulates - COD, as was already explained...


Those fried golden wires you're talking about must have come from some serious cap-zapping!

good thinking, with the dim LED-glow!

manuel

".....with the result that the new laser device shows no kinks up through 600mW to 700mW optical output."

".... predicts demand for a 900mW laser diode, offering about double the output power of the current 450mW model, and plans to...."

:drool:

I wonder if they know about crazy people who rip apart state-of-the-art blu-ray burners to make pointers that burn junk...lol

Tabish said:

I wonder if they know about crazy people who rip apart state-of-the-art blu-ray burners to make pointers that burn junk...lol

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I, instead, wonder how much of the producers of these blu-ray burners have "undercover agents" in all the laser forums, that report the asking and GB's of their products, so they can increase the prices when the request of to-be-mangled burners increases ..... :eg: :crackup:

Will we need completely new hosts for these diodes?

Crazy Jay said:

Will we need completely new hosts for these diodes?

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If you put them in an old host they will laugh at you and taunt you in your sleep.

Crazy Jay said:

Will we need completely new hosts for these diodes?

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Probably not. The 5.6mm standard seems to be holding. They are working on a 3.8mm diode as well though.

Peace,
dave

I'd be more worried they would make them larger, not smaller! :undecided:
Now the 450mW 12x's will probably still be 5.6mm cans (i hope :angel....


But the future 900mW?!? In addition to the 900mW of optical power the diode will also create (and have have to dissipate) ~3.6W of HEAT (assuming ~20% efficiency)!
How will a 5.6mm can do that? Look at the pedestal of an open can! It's big for a reason - heat has to flow through it and the base into the heatsink...

Now we have BluRay diodes already exceeding open cans in power (altho i still don't understand how that is possible with 8x's - i expected 400-500mW from 12x's)!
For now, the tiny 5.6mm cans seem capable of dissipating all this heat into the heatsinks, but i wonder what a 900mW diode would look like! I'm thinking 9mm cans if not some flat chip thing mounted on a block of aluminum... :undecided:

Now THAT would be BAD for the laser hobby! I remember buying a 22x DVD writer only to find a flat-chip LD inside! We'd have to have special modules CNC machined (luckily we are adjustable)!


But I surelly hope no one in the BluRay LD industry decides to go that way and that they stick with our beloved 5.6mm cans for as long as physically possible! :angel:




Dave: Many of the diodes we use also exist in 3.8mm can versions, for laptop DVD/BR writers.. Email me if you want to see some datasheets...

If they come with a 9mm diode case, a Meredith module would work, and the heatsink fit for the Meredith...

But better yet, we'll just machine the fit on your V3 direct press heatsink Igor!

Wouldn't it be better if the diode was bigger? It would be a pain to make new heat syncs and find hosts to put them in but it could take more abuse.

About time for the industry to accept the C-mount diode.

HMike

HIMNL9 said:

I, instead, wonder how much of the producers of these blu-ray burners have "undercover agents" in all the laser forums, that report the asking and GB's of their products, so they can increase the prices when the request of to-be-mangled burners increases ..... :eg: :crackup:

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ROFL. I doubt that happens though. I mean over 99% of people who will purchase em will use em to, well, burn blu-rays. Not their fingers lol


As for the heat issue. Perhaps they have increased the efficiency ?

900mw will generate insane heat through the 5.6mm diode assuming same efficiency as 8x...


Anyone know what materials current diodes are made of, especially their base???

Maybe they will use more thermally conductive materials for 12x

Tabish said:

As for the heat issue. Perhaps they have increased the efficiency ?

900mw will generate insane heat through the 5.6mm diode assuming same efficiency as 8x...

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Daguin told me that the current is low for its intended use. So if you use it as an actual bluray burner it wouldn't over heat, but I'm probably wrong.

But of course everyone here would buy it to burn through more than BD-R's :eg:

Uhm, i don't know their internal design, but can say that, usually, the efficency of a resonant cavity is also in function of the lenght of the cavity ..... just wondering, ofcourse, but if they make the chip (that basically IS the resonant cavity, for a LD) more long, they can increase a bit the efficency and obtain more power with less current.

I suppose that is a bit too difficult, that someone already have a macro pic of a 12X decanned diode, for comparison ?