Blu-Ray Writer Harvest - Success!

jayrob · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

SuperNova said:
Hi

Never messed with a blu, but the pic seems to indicate both leads with a wire attached are not the ground. maybe I cant see the photo well or I dont know how the blu pin config works, but those pins seem to be insulated from the case.

SN

Yeah...the normal 'red' diode pin out connection did nothing. (that is, on my last diode. I connected this new one, like the picture) I connected it this way, and it works. Now, I'm not sure if I can connect the heatsink to the host. Because I am using a DDL driver, which means that the negative side of the battery, is a direct connect to the case of the MXDL/LD case.

P.S. The other strange thing is, the last one of these, gave me a reading of 40mW's @ 70mA's. (but is was a Meredith glass lens) This one is only giving me 21mW's @ 75mA's. (Meredith acrylic) I am getting a 4.6 volt reading between the two leads @ 75mA. But, 2.84 volts between the positive lead and the LD case. ??
Turned it up to 80mA's. Got a reading of 24.8mW's, and 4.64 volts between the leads.
Who knows if this Sony sheet is the right information:
http://www.sony.net/Products/SC-HP/pro/laser_diode/blu_ray.html
I wonder if I should turn it up some more? I need some advice here...
Jay

P.S.S. Why the two different voltage readings?

supernova · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

found this in a thread elsewhere:

"also, another nice thing is, the diode is isolated from ground on both ends.
So far, I like it a lot."

It seems you should not ground power to the case of the diode from that quote.

Is there a way you can isolate the power from the housing?

If not it seems it may be difficult to use a heatsink or even mount it without a ceramic/plastic/rubber isolation.

I cant find any more detailed info aside from that.

SN

*edit*
The volt difference may have to do with the actual resistance of the diode as the case is not connected to either side, one pin is under load and the other pin is on the non loaded side. Or simply not having a ground on the meters negative lead (as the case is not connected to anything) is like placing the positive meter lead on a + battery side and leaving the meters negative lead in the air.

jayrob · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

Man I don't know enough about electronics to be messing with this expensive diode. If the die is isolated from the case, why would there be a 2.84 voltage reading between the positive lead and the case? On the other hand, if the case is not connected to either side, why would it matter if the negative side of the battery connected to the case, as well as the negative lead?
Jay

supernova · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

Over my head as well too i think, Knowing that the hairlike wires inside the diode are very close to the case and each other, seems even humidity or proximity could change the resistance or voltage reading via a meter. Some meters in resistance mode may even use too much voltage to test with and could cause a short in devices this miniature.

I will keep searching for a better data sheet on these diodes.

Which model # is the one you have specifically?

There are 3 in production on the sheet I read, with more to come, I didn't check the dates on the productions.

SN

jayrob · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

Thanks for your efforts there... Any help at all I can use here. The drive is a Sony BWU-100A blu-ray 2 X writer. I really don't want to have to isolate the heatsink from the MXDL body if don't have to. I wonder if I tried it, it would just not turn on? Or, if I could fry the diode?
Jay

jayrob · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

Here's a graph of 9 different current readings that I took so far. Readings were taken with my LPM-1 at 473nm X 1.75 using a Meredith acrylic lens. Notice that it started getting 'steeper' again after 95mA's. About 3 mW's gained per every 5mA's current. Think I should I go higher?
Jay
P.S. Voltage between the positive lead and the LD case is 4.3 at 110mA. Across the leads is 5.0 at 110mA's. Hmmm...that's what that Sony information sheet says the voltage is supposed to be. I think I better leave it at 110mA's...

Edit: After testing a 6 X diode, and then talking to Hemlock Mike for a comparison, the LPM-1 conversion rate for the 6 X blu-ray diodes is 2.6, not 1.75. I believe it is true for this 2 X blu-ray diode as well. This graph was made at the 473nm X 1.75 conversion rate. So, my 2 X blu-ray at 110mA's is actually putting out 63.2mW!

drlava · Feb 23, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

Wow, I'm suprised how shallow the slope is, I was expecting about 1mW/mA...

jayrob · Feb 24, 2008

Re: Blu-Ray Writer Harvest - 3rd Times a Charm -I

drlava said:
Wow, I'm suprised how shallow the slope is, I was expecting about 1mW/mA...

Any idea on the question I have on the pin out? I am getting a 4.3 volt reading between the positive lead and the LD case with it turned on. No voltage between the negative lead and the LD case. I am wondering if it will be ok to connect the heatsink/LD to my MXDL host, which uses a DDL style driver. So, it would be like connecting the unused pin, to the negative lead.
Any thoughts on this?
Jay

drlava · Feb 24, 2008

Hi, as for your case isolation question, it might be OK but I can't say for sure because the datasheet doesn't have specifications about this. It's true that in its operating environment the case is grounded.

more blu-ray writer results here! (along with the > 1mW/mA slope):
http://www.laserpointerforums.com/forums/YaBB.pl?num=1203129030/42#42

jayrob · Feb 24, 2008

drlava said:
Hi, as for your case isolation question, it might be OK but I can't say for sure because the datasheet doesn't have specifications about this. It's true that in its operating environment the case is grounded.

more blu-ray writer results here! (along with the > 1mW/mA slope):
http://www.laserpointerforums.com/forums/YaBB.pl?num=1203129030/42#42

Thanks drlava. I had been reading your post already. Heck, I have the graph printed out already! That's my next drive to harvest!

Well, just to let you guys know, after I saw how HOT that 4/6 X diode is, I figured...'if I kill this one, it will be a good excuse to get that drive'! So, I went ahead and went with my gut instinct, and connected the heatsink/LD to the MXDL case! I even checked it with an ohms meter to make sure it had a good contact before I turned it on! Lol.

I am happy to report, that it works just fine. The mW reading was the same, whether the heatsink was connected to the MXDL case, or not...
Jay

amkdeath · Feb 24, 2008

jayrob said:
[quote author=drlava link=1202396141/60#72 date=1203813795]Hi, as for your case isolation question, it might be OK but I can't say for sure because the datasheet doesn't have specifications about this. It's true that in its operating environment the case is grounded.

more blu-ray writer results here! (along with the > 1mW/mA slope):
http://www.laserpointerforums.com/forums/YaBB.pl?num=1203129030/42#42

Thanks drlava. I had been reading your post already. Heck, I have the graph printed out already! That's my next drive to harvest!

Well, just to let you guys know, after I saw how HOT that 6 X diode is, I figured...'if I kill this one, it will be a good excuse to get that drive'! So, I went ahead and went with my gut instinct, and connected the heatsink/LD to the MXDL case! I even checked it with an ohms meter to make sure it had a good contact before I turned it on! Lol.

I am happy to report, that it works just fine. The mW reading was the same, whether the heatsink was connected to the MXDL case, or not...
Jay

[/quote]

now im sad.. no more 6x drive... way to spil the happy ending man...

JUST KIDDING

NICE!!! A BLURAY BURNER! beam shots, beam shots are needed!!

jayrob · Feb 24, 2008

amkdeath said:
now im sad.. no more 6x drive... way to spil the happy ending man...

JUST KIDDING

NICE!!! A BLURAY BURNER! beam shots, beam shots are needed!!

Oh heck yeah I'm still getting a 4/6 X drive to harvest! After seeing drlava's plot? Man, for sure. I'll probably be happy with this for a while though. If it lasts! Meanwhile, the other drive may come down in price. Not too sure how my camera will do with the violet, but I will get some pictures soon. When it gets a little darker...
Jay

jayrob · Feb 24, 2008

I'm not too good a taking 'low light' pictures. This picture is not too good of quality. But, for an idea of the comparison between the PS3 @ 16.7mW's vs my BWU-100A blu-ray @ 63.2mW's, here they are together...
Jay

jayrob · Feb 24, 2008

Here's a picture of both in normal room light:

And here's a picture them together when I accidentally moved the camera during the exposure:

scopeguy20 · Feb 24, 2008

Any chance you could build one of those 40+ mW bluray lasers for me?

jayrob · Feb 24, 2008

scopeguy20 said:
Any chance you could build one of those 40+ mW bluray lasers for me?

The only thing about that is the price of the drives! This last one, I got for $220. Plus other parts for the build. But the drive to get is this one!:
http://www.nowdirect.com/exec/partInfo/part_detail.tsb?prcpart=LGOGGW-H20L
That's the 4/6 X drive that drlava & Hemlock Mike are getting over 100mW's of blu-ray out of! Man, I wish I would been just behind them in this 'writer build'. Then I would have paid for that drive instead!

The thing about building one to sell, is that I would have to take the chance of accidentally killing the diode. Unless you might want to buy this one. Then I could buy the 4 X drive! Well, it would be hard to let it go so soon. This MXDL host that I found, is really nice too...
Jay

Blu-Ray Writer Harvest - Success!

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