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Old 02-18-2008, 10:06 PM #33
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Default Re: How to turn a GB diode into an open can!

My 0.02 worth, The windows cause etalon type effects causing several modes to oscillate at once in the LD.

If you do this to the rohm laser diodes you increase the longitudinal mode coherence length to about 160 meters up from about 30 meters or so; might do the same for other makes as well. Good for holography! Also, anyone tried a lg or pioneer open can for holography yet?


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Old 02-23-2008, 09:39 AM #34
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Default Re: How to turn a GB diode into an open can!

lol i want to see beam shot "before/after"style will you post ?
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Old 03-06-2008, 02:17 AM #35
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Default Re: How to turn a GB diode into an open can!

Here are some pics of a PS3 Bluray LD with the can opened up. (Still functional)

Freshly opened can:




The Business End


Stained Glass Window (note "burned" area)


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Old 03-06-2008, 02:35 AM #36
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Default Re: How to turn a GB diode into an open can!

The second open can blu ray, dude you're a legend. [smiley=happy.gif]
Amazing pics.
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Old 03-06-2008, 07:15 AM #37
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Default Re: How to turn a GB diode into an open can!

Quote:
Originally Posted by chimo
Here are some pics of a PS3 Bluray LD with the can opened up. (Still functional)
Your photos are always awesome. I bet you will get an increase of at least 5% by removing the can.
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Old 03-06-2008, 12:10 PM #38
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Default Re: How to turn a GB diode into an open can!

Thanks guys. I know I'm driving the hell out of this one - I'm surprised it had not fried yet. I'll attribute that to very short duty cycles (probably less shorter than 15sec).

It's back in the pointer now. If my Coherent Head is 1uV/mW and my DMM is anywhere near accurate at that low end, it's putting out around 70-80mW! Makes me think of the expression: "The candle that burns brighest, burns shortest"

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[quote author=chimo link=1189268933/30#34 date=1204773477]Here are some pics of a PS3 Bluray LD with the can opened up. (Still functional)
Your photos are always awesome. I bet you will get an increase of at least 5% by removing the can. *[/quote]
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Old 03-30-2008, 06:01 AM #39
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Default Re: How to turn a GB diode into an open can!

Would it be possible to fill the lower part of the diode with some sort of glue so that it would transfer the heat better?
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Old 03-30-2008, 12:35 PM #40
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Default Re: How to turn a GB diode into an open can!

I believe any improvement would likely be negligible and the risk high so I would steer away from that one.

Quote:
Originally Posted by hydrogenman15
Would it be possible to fill the lower part of the diode with some sort of glue so that it would transfer the heat better?
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Old 03-30-2008, 01:53 PM #41
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Default Re: How to turn a GB diode into an open can!

Quote:
Originally Posted by hydrogenman15
Would it be possible to fill the lower part of the diode with some sort of glue so that it would transfer the heat better?
In general, good thermal conductivity means good electrical conductivity, which means it would short out the diode. There are about 3 ways to conduct heat in a solid: electrons, phonons, and photons. In general, whatever you add to heatsink with won't be transparent, and having nothing there is a much more efficient way to let photons out of the diode, so photons as a means of heat dissipation are out. A glue or liquid substance that hardens probably won't be a good phonon transfer medium, so that's out. That leaves really the only good way to conduct heat out of the diode as electrons. And if electrons are free to move, then the material conducts electricity, and would short out all the contacts.

So unless there's some thermal epoxy material that conducts heat through phonons efficiently and is completely electrically insulating, the diode makers have already done all the heatsinking you can do for these things on that scale.
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