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Some possible innsight on the 6x diodes






JLSE

JLSE

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The GGW-H10N is expected to be released in May, just at the same time as Sharp Corporation's new laser technology for Blu-ray and HD DVD drives will appear, or better said appeal on/to the market. This new technology uses a 210mW blue-violet laser diode, which should yield recording speeds of up to 6x the speed, compared to 2x or even some models, like the one presented in this article, at 4x.
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http://news.softpedia.com/news/LG-and-Hitachi-prepare-a-Blu-ray-HD-DVD-Drive-49535.shtml
 
JLSE

JLSE

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20 November 2007

Nichia achieves 420mW pulsed operation of violet laser
Japan’s Nichia Corp has developed a violet laser diode operating at an out put power of 420mW in pulsed mode, with an estimated lifetime exceeding 10,000 hours and stable operation for 1000 hours at a case temperature of 80°C.

The performance is sufficient for next-generation DVD recorders with a double-layer disc operating at more than 12x record speed, or a quad-layer disc at more than 2x record speed.

Nichia has already been mass producing lasers with pulsed-mode output powers of 130mW since April and 180mW since June. The firm said in May that it planned to mass produce a 250mW model (for 8x speed recording) in January and a 320mW model (for 10x speed recording) in first-half 2008.

Nichia adds that it is aiming to expand its production capacity as well as improve product quality in order to meet demand for the next-generation DVD market.
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http://www.semiconductor-today.com/news_items/NEWS_2007/NOV_07/NICHIA_201107.htm
 
Hemlock_Mike

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We have been building with BR's from 6x drives and so far, I have only pushed to 165 mW.  I'm a little afraid to go farther because the diode is too $$$$  :D  Others are being more conservative on power and I don't blame them.   250 mW would be nice and we often run LD's in CW mode up near the published pulse range.

Mike
 
JLSE

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Thanks for the reply Hemlock, I came across these pages late lastnight and read as many as I could find. So from what ive read, id gather that 160-180ma range is probably a safe one? Considering that the heatsink they come in cant be as efficient as a larger one. Does the pulse make that much of a difference?

Also, 420mW for a 12x? That has to be good news for the eventual release of an 18x-20x :)
 
phenol

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So from what ive read, id gather that 160-180ma range is probably a safe one?
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GooeyGus blew his first 6x by accident at 240mA or so.
I dont think we can draw direct parallels between overdriving reds and blu-ray - both use different materials (AlGaInP vs GaN) and probably different passivation techniques to reach higher COD power levels.
Anyway, we are seeing steady progress in power levels and I wouldnt be surprised if within 2-3 years those BDs are on a par, if not stronger, than current red open cans.
 
JLSE

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I set up a BR labby with TEC, I think ill put a 6x diode in there and start playing with it. Im curious to see where the limit is. :eek:
 
S

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My guess is that they can be safely operated at somewhere between 180-200 mw.
It will be good to finally see some figures though. I understand peoples reluctance to test them but this is a hobby on the edge, you have to take some risks sometimes. :)
 
Hemlock_Mike

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Scog  --

You da man !!!!  I'm at 160 mA -- you take the next 10 mA step and I will follow with another 10 mA  ;D  
We'll lead the way :D
I went to 160 mA because DrLava sorta challenged me. This is how we push the limits.


Mike
 
JLSE

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LOL, "ill do it, if you do it" ;) You know what you guys should do, is take a collection or a fundraiser to purchase a sacraficial diode.
 
GooeyGus

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I'll set my driver at 150mA tonight and post the results. it will probably take my forever to figure out the resistor combinations though.

Oh yea and I know for sure they will die at 280ish mA. BUT one thing to note is that it did last surprisingly long ;D It had to be about 8 seconds at close to 300mA. Yea, it was bright.
 
JLSE

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Almost forgot, here is the 803t I killed today. It was doing good at 100mW, and then crapped from duty cycle testing. I was on the 5th minute, and I guess thats what killed it. The heatsink measured 33.7 degres C at the time of death, but still working on finding what current it was at. :mad:


[media]http://www.youtube.com/watch?v=wLbRlwsFUu8[/media]
 
S

Scog

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Hemlock Mike said:
Scog --

You da man !!!! I'm at 160 mA -- you take the next 10 mA step and I will follow with another 10 mA ;D
We'll lead the way :D
I went to 160 mA because DrLava sorta challenged me. This is how we push the limits.


Mike
Click to expand...
If I had one I would Mike, maybe after I sell a couple of Kryton 803ts. For me the risk is easy to justify. The expense however, is not.
I hope one day I can join you noble pioneers. :)
 
GooeyGus

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Well mine is set to 150mA and i'm getting close to 140mW of 405 :eek: :eek: :eek: :eek:

its gorgeous to say the least.
 
JLSE

JLSE

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I had mine running at 178ma and it seems it would have been ok but I ran it for 5mins straight.
I pushed my 6x to 240ma and got the magic flicker! It would seem that with TEC 210ma is doable but im not sure how safe. When I put my hand in front of the beam (focused infinate) it scortched my skin faster than my 300mW green!
 
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