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Pioneer 8X Blu-Ray-- BDR-203

Hemlock_Mike

Hemlock_Mike

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That graph is very informative. We finally see a knee in the power curve on a Blu. In the past, on reds, that knee indicated the limit for the diode. Also called the point of diminishing return.

Good work Dave.

Mike
 





A

Ammar

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How very impressive!
Both, the tester and the tested one, did a great job.
 
daguin

daguin

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rkcstr said:
Hey Dave, I can tell you how to raise the max input voltage from ~12V up to somewhere around 16V, if you want.
It just involved removing one component (the input MOSFET) and making a solder bridge between two pads.  It will defeat the input polarity protection, but I think you're probably careful enough ;)
BTW, the whole reason I haven't made it past 12V input protection is the availability of a suitable MOSFET for the job.  The one I use has a combination of characteristics that allow for a versatile range of input voltages, but maxes at 12V.  There are some that will do 20V+, but the minimum input voltage is around 4-5V or so, meaning that if someone wanted to run an IR diode, it may not work... so I just stick with the one I have.
EDIT:  nevermind, guess you did that already... I didn't read entirely through to the latest posts  :)
Click to expand...

I haven't done it yet. My bench PSU has a 12V setting. That's what I powered the driver with. The concern, of course, is with hosts that use three, AAA size batteries. That would power this diode fine, but would exceed the rating of the mosfet when fully charged. Most of these hosts use a battery carriage so reverse voltage is harder to do (not impossible, but harder). I think that I have a picture (from humansymphony or maybe it was drew) that shows the bypass.

I have an MXDL (DX #3405) with a Jayrob heat sink here I could use. Maybe I'll try to find that picture and run the "use" test in the MXDL

Peace,
dave
 
daguin

daguin

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jayrob said:
Dave, you animal!
That is amazing! :cool:
You also said it has an open can red? Do you know if it is a long open can, or a short open can?
Jay
Edit: Oh... I just read back and saw that you said it was a 3.8mm diode case. So it is a completely different red diode than we have seen so far. Great stuff Dave!
Click to expand...

Daniel is going to make me a heat sink for the 3.8mm diode when he gets home in a couple of weeks so I can push this little red around a bit. The drive is only rated at 16X for DVD so it may not be worth the trouble, but we won't know until we look.

Peace,
dave
 
GooeyGus

GooeyGus

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can you imagine the tiny hosts that could be built with that tiny red? Usually the 3.8mm diodes require less voltage than their 5.6mm counterparts, so let's hope this one is no different!
 
Hemlock_Mike

Hemlock_Mike

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Someone with contacts over there --- Start a GB for sleds. I'm starting to drool !!!!

Mike
 
C

climbak

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Hmm. This diode looks very promising. I may have to get a few and test their spectra and how easily they can be made single mode.
 
Spyderz20x6

Spyderz20x6

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Wait...
You mean the diode is multi-mode :-?
That doesn't seem likely, considering it is in a 5.6mm package...
 
JLSE

JLSE

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Spyderz20x6 said:
Wait...
You mean the diode is multi-mode :-?
That doesn't seem likely, considering it is in a 5.6mm package...
Click to expand...


Package doesnt matter.. I have yet to see a single mode 808 in a 5.6mm. Weather they are leadlight pumps or cheap china pumps, all multi. :(

I guess it depends on application, and what the customer requires.
 
daguin

daguin

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WannaBurn said:
[quote author=Spyderz20x6 link=1236464366/64#74 date=1236835113]Wait...
You mean the diode is multi-mode :-?
That doesn't seem likely, considering it is in a 5.6mm package...
Click to expand...


Package doesnt matter.. I have yet to see a single mode 808 in a 5.6mm. Weather they are leadlight pumps or cheap china pumps, all multi. :(

I guess it depends on application, and what the customer requires.[/quote]

How did 808nm get into the conversation about 405nm diodes?

Peace,
dave
 
JLSE

JLSE

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daguin said:
[quote author=WannaBurn link=1236464366/64#75 date=1236835902][quote author=Spyderz20x6 link=1236464366/64#74 date=1236835113]Wait...
You mean the diode is multi-mode :-?
That doesn't seem likely, considering it is in a 5.6mm package...
Click to expand...


Package doesnt matter.. I have yet to see a single mode 808 in a 5.6mm. Weather they are leadlight pumps or cheap china pumps, all multi. :(

I guess it depends on application, and what the customer requires.[/quote]

How did 808nm get into the conversation about 405nm diodes?

Peace,
dave[/quote]


My appologies... It is impossible for the 405nm diode to be multimode cause its 5.6mm :-? Just throwing an idea out ;)
 
C

carulli

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I doubt the diode is multimode as it is an optical drive but i very well could be wrong.
 
JLSE

JLSE

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From what I have read in the past, the PS3 sled diodes were multimode @ 5.6mm. There is some mention of it here... http://www.repairfaq.org/sam/Blu-ray/site1/diode.html

I doubt that these burners are using multimode, but I wouldnt base an assumption simply on package type alone.

*Edit. Not sure if it has anything to do with it, but there is corrective optics in the 4x, 6x, and possibly 8x that you do not find in reader sleds. There must be a reason why they are used, specifically in line with the 405nm diode.
 
pullbangdead

pullbangdead

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Multi-mode vs single-mode is completely relative.  Technically, every diode is multimode, there is always more than 1 mode in the output; it's really just the degree to which other modes are present besides the main mode.

There are numbers that can be measured/calculated to show "how single-mode" a laser diode is, something like a mode suppression ratio, which tells something like the ratio of power in main mode to power in any other mode.  You can do things like playing with external cavities to "get rid" of the other modes, and make a "more" single-mode output.

It's complicated, to say the least. And I suck at describing this stuff, plus they didn't offer the 2nd quarter of the laser diode specific course this year, so I've got a bit more to learn anyway.
 
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