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FrozenGate by Avery

Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Maybe the "?" is a mirror HR@808 and AR@1064 to give another pass to the gain medium?
 





That is one busy little module :eek:

Definitely an alignment nightmare for the hobbyist. The proverbial '10ft pole' comes
to mind.

Anybody LPM'd one of these yet?
 
Which are you talking about? The green module or the RGB module?

I have one on the way, I'll try to get some white light out of it.
 
Does the projector have built in memory/sd card slot to display pictures and videos from or does it have to be hooked up to something at all times? If it has a sd slot you could just fill it with pictures that are just solid color arranged by wavelength. And put in a mirror to deflect the beam out the side before the mems. Then you could sit there flipping through the rainbow with your laser.
 
Always needs an input. However, it has native iPod support, so you can create an elaborate laser colour changing app if you so desire :p
 
This is simultaneously embarrassing and depressing to admit:

I've lost my 457nm Osram. Physically. I can't find it! This is so weird. I never just lose diodes, especially not such special ones :(
 
The one you marked "green blocking filter" is more probably the 808->1064 converter ..... the one marked "?" can be a mirror or a waveplate filter, but is difficult to say it precisely, without have it in hand for do some tests, sorry.



EDIT: can be interesting if the next one that want to rip one of these projectors, before, can do a test on these units with an oscilloscope, for signals and levels ;)
 
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I know in the pico projectors, the green laser is polarized oppositely to the red and blue diodes, so there's a good chance there could be a waveplate in there.
 
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HIMNL9 said:
The one you marked "green blocking filter" is more probably the 808->1064 converter ..... the one marked "?" can be a mirror or a waveplate filter, but is difficult to say it precisely, without have it in hand for do some tests, sorry.



EDIT: can be interesting if the next one that want to rip one of these projectors, before, can do a test on these units with an oscilloscope, for signals and levels ;)
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Do you mean a Nd doped crystal with 808->1064 converter? I don't think that's the case because then the big lens afterwards won't make sense, it would make the cavity unstable if it would have a cavity at all, the now marked gain medium isn't positioned to reflect anything from the pump side but to reflect from the SHG side.

My guess would that the "green blocking filter" would be something like a FAC to get a better beam profile at the gain medium. The gain medium looks tiny, any chances this is an OPSL? It looks overly complicated for a doubled Nd:YAG or Nd:YVO4 laser. OPSL's can be modulated faster after all. The SHG crystal is periodically poled and temperature regulated, not something for a typical doubled Nd:something laser.

I don't know how OPSL's work, but the gain is probably broad which you don't want for SHG, so that unkown optic may be an etalon. Just guessing here, somebody should check the wavelengths involved in here.
 
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^ well, it don't LOOK as a FAC, but that is one of the problems, from that point of view only, is difficult to say what it can be (also the lens ..... only cause it look round and enclosed in a tube, it don't mean 100% that is just a lens) ..... also, a reflection gain medium ? ..... hm ..... still possible anything, without have the unit in hand for do some tests anyway, yes .....
 
Another more simple test method would be to simply test a working projector on a spectrum analyzer and see if the green component falls on 532nm or if it's some other wavelength. That will tell more about the technology involved without even being invasive.
 
qumefox said:
Another more simple test method would be to simply test a working projector on a spectrum analyzer and see if the green component falls on 532nm or if it's some other wavelength. That will tell more about the technology involved without even being invasive.
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It is absolutely positively 532nm. It's the "Corning G-1000"

It's not made anymore, but you can still find information on it. It is definitely 532nm.
 
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