Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers



Blu-Ray/445 Diode Test Current Levels for Long Life

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Re: Blu-Ray Diode Test Current Levels for Long Life

From the limited experience i had with them and what i heard, they don't seem to be as tough as the old GGWs were.. 200mW might be too much for them, 170mW would be the minimum i would hope to get reliably, but might yield "too much" time. Or not.. They are really strange, their average efficiency much higher than that of old GGWs, they should have a 100mW CW/200mW Pulsed power rating, but somehow i don't trust them as much.

I'll probably set it in the middle and see what happens. I predict this test will be over before the 12x arrives...
I too, have noticed the higher efficiency of the Sanyo SF-AW diode,
compared to the GGW.

It also shows no "kinks" compared to the GGW.

This should enable it to deliver similar power, but many times it doesn't.

My guess is the diode will deliver 200mw on your test rig with the same heatsink.

Sanyo rates it @ 200mw pulse power (graph in post #25)

Surely, it can handle that level.

LarryDFW
 
Last edited:



IgorT

New member
Joined
Oct 24, 2007
Messages
4,177
Points
0
Re: Blu-Ray Diode Test Current Levels for Long Life

It also shows no "kinks" compared to the GGW.

This should enable it to deliver similar power, but many times it doesn't.
GGWs were the first diodes where i stopped seeing kinks. The second was the 100mW CW/200mW Pulsed Nichia, which i have in Jayrob's 10280 Keychain host producing 204mW after acrylics (very comparable to GGWs, and seemingly just as tough).

Since 4x's are 85mW CW/170mW Pulsed, i assumed that means that diodes with ratings above that, or rather 100mW CW or better will have no kinks.


Seeing how the SF-AW also has no kinks and good efficiency (if GGWs showed such efficiencies during my pre-testing, i wouldn't have to weed any out!) i also thought they could hold up with GGWs or the 100mW Nichia, but then i lost one at 210mA after only a couple of weeks of normal use, and heard of another poofing at 180mA (or was it 180mW?)..

Some GGWs can also give up too soon at those currents/powers, but it's very rare, so this kinda made me worried about the SF-AWs... That's why i'm recommending 170mW max for now, when someone asks me. But i would like to get out more, if safelly possible - that's why i want to do the test.



My guess is the diode will deliver 200mw on your test rig with the same heatsink.

Sanyo rates it @ 200mw pulse power (graph in post #25)

Surely, it can handle that level.
That would be ideal, but for some reason i dare not go that far just yet.


But how do you know what the SF-AW is rated as? Because the chart shows 200-210mW Pulsed for 6x's?

Do we even know for sure what the SF-AW is? I mean, i don't know which drive it is from, perhaps it is known, i wasn't around when they appeared...

But on the other hand, BDR-S03's also show no kinks, and yet there is speculation they are not even 6x's...


It's possible that kinkless diodes appeared below the rating of 100mW CW, or perhaps 100mW CW diodes from different manufacturers simply vary in toughness, or rather their flexibility towards overdriving.

I have a couple of "S03s" from Dave here to torture. I'll hook one of those up as soon as there is an empty space in the Torture Chamber again...
 

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Re: Blu-Ray Diode Test Current Levels for Long Life

GGWs were the first diodes where i stopped seeing kinks.
Since 4x's are 85mW CW/170mW Pulsed, i assumed that means that diodes with ratings above that, or rather 100mW CW or better will have no kinks.

Seeing how the SF-AW also has no kinks and good efficiency (if GGWs showed such efficiencies during my pre-testing, i wouldn't have to weed any out!) i also thought they could hold up with GGWs or the 100mW Nichia, but then i lost one at 210mA after only a couple of weeks of normal use, and heard of another poofing at 180mA (or was it 180mW?)..
This is drlava's recent chart of the GGW (courtesy of Steve @ L.Enthusiast):

He also charted the SF-AW with the same equipment showing no kinks.

But how do you know what the SF-AW is rated as? Because the chart shows 200-210mW Pulsed for 6x's?

Do we even know for sure what the SF-AW is? I mean, i don't know which drive it is from, perhaps it is known, i wasn't around when they appeared...

It's possible that kinkless diodes appeared below the rating of 100mW CW, or perhaps 100mW CW diodes from different manufacturers simply vary in toughness, or rather their flexibility towards overdriving.
The SF designation denotes Sanyo sleds, according to several different sled dealers.
I would think that Sanyo would use their own BR diodes in their sleds.
Sanyo states 200mw pulsed power as a requirement for a 6X drive.

Sony has described making "kinkless" diodes in some of their press releases.

Sony - We have fabricated 400-nm-band GaN-based blue-violet laser diodes (BV-LDs) with high reliability on GaN substrates. Under 45 mW continuous wave (CW) operation at 60°C, these LDs have been operating stably for more than 1400 h. We have adopted the narrow ridge width of 1.4 μm and both sides of ridge stripe are covered with a stacked layer of Si on SiO2. As a result, we have succeed in producing BV-LDs with a kink-free output power of more than 150 mW. The threshold current was 35.4 mA at 25°C. The operating current and voltage were 65.8 ma and 4.66 V, respectively, under 45 mW CW operation at 25°C.

LarryDFW
 
Last edited:

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Re: Blu-Ray Diode Test Current Levels for Long Life

Tested the new "Green PCB diode" that sk8er4514 got from his supplier.

While it did not seem to be an 8X,

it did seem to outperform the 6X GGW I have charted.

http://laserpointerforums.com/f38/8x-sled-diode-47634.html

I would rate it as a more efficient 6X GGW and operate at the same current.

LarryDFW
 

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Re: Blu-Ray Diode Test Current Levels for Long Life

Igor reported 450 hours today on his 1st 8X test diode.

This is a great accomplishment considering the diode was operating @ 150% of the maximum peak power level.

So ...
160% of peak power should a safe "long life" level for 8X and 12X diodes.

LarryDFW
 
Last edited:

HaloBlu

New member
Joined
Dec 27, 2009
Messages
1,326
Points
0
Re: Blu-Ray Diode Test Current Levels for Long Life

Excellent & of great use to many. Sticky?
 

RDTech

Active member
Joined
Apr 6, 2010
Messages
263
Points
28
Re: Blu-Ray Diode Test Current Levels for Long Life

I understand it will be difficult to find out which diode goes into each type of burner, but we have Sont, Sanyo, Sharp, Nichia, Etc. I will try and get the actual data on certain diodes and attempt to put them in a spreadsheet with mfg, diode m#, output power (CW) since nobody is using pulsed here,Iop,& Imax if available. We shhould know which laser diode is in these sleds rather than guessing by the sled, and killing laser diodes to reverse engineer the products. I believe we will save money. I do think that calling Toshiba or Plextor and saying "hey, can you tell us what laser you are using ?" will work....
 

HaloBlu

New member
Joined
Dec 27, 2009
Messages
1,326
Points
0
Re: Blu-Ray Diode Test Current Levels for Long Life

Blu-ray lasers Did play movies when they where part of the Blu-ray player / burner we ripped them out of.
~EDIT~
Guess whohasbatman69 met 2007rev's BanHammer. :na:
I thought it was a real question. :eek: Hey some members are really young!
 
Last edited:

marihuano

Member
Joined
Mar 11, 2010
Messages
91
Points
8
Re: Blu-Ray Current Levels for Long Life

Well now that you put it that way...

I guess I am just used to seeing the 5,000 hour life times on all of the laser sites :p
Me too :(. 1000 hrs would be a very good number
 

daguin

New member
Joined
Mar 29, 2008
Messages
16,573
Points
0
Re: Blu-Ray Current Levels for Long Life

Me too :(. 1000 hrs would be a very good number
We would need to reduce our recommended currents to the current recommended by the manufacturer for this to happen

As you can see from the OP, we drive all of them harder than they are driven in BluRay burners

Peace,
dave
 

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Re: Blu-Ray Diode Test Current Levels for Long Life

Well, finally it looks like the 450/500mw BR diodes are going to be released . . .

according the the BlueRay standards committee.

We have waited quite a few months.

LarryDFW
 

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Re: Blu-Ray Diode Test Current Levels for Long Life

Added 445nm diodes to the 1st post.

Larry
 

Ramsey_innovations

Active member
Joined
May 10, 2009
Messages
375
Points
28
Larry, I know it's not the hot topic right now with 445 taking the stage but I was wondering what you would consider a "safe" input value for a 10x BR diode to be? Is there enough info around? I know several members have benn running them from 350ma to 400ma and I too am running my LG 10x @ 370ma with 4hrs run time and no significant degrations. I have noticed a unique difference in output structure between the 10x diodes and the other BR diodes I have worked with. The 10x does not exibit wings like other BRs but instead it has two very small dots on either side in place of the wings. In addition I am able to achieve lower divergence (1.25mmX1mm @25ft) while using the same lens (405-G-1) than with other BR diodes. Thanks Larry!
 

LarryDFW

Well-known member
Joined
Dec 6, 2008
Messages
1,579
Points
63
Larry;

Lower divergence sounds very promising.

Thanks for reporting the divergence info.

Based on the testing for 8X & 12X,

I think 400ma should give you over 100 hours of life.

LarryDFW
 
Last edited:




Top