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Old 07-22-2011, 09:16 PM #49
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Have you got the green running yet?


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Old 07-22-2011, 09:34 PM #50
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

IMHO, I doubt it really is a single pass ppln device, more like a extended cavity device. One way to find out.....
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Old 07-23-2011, 12:29 AM #51
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Quote:
Originally Posted by bhwollen View Post
Have you got the green running yet?
nope - haven't tried recently either
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Old 07-23-2011, 12:31 AM #52
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Thats a shame. you should try again.
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Old 07-23-2011, 01:19 AM #53
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

For me the green would be the main reason to get it.

I think it was himnl9 that said the crystal is temperature tuned for the pump wavelength, so I would set up a simple ddl for like 200ma and hook it to two pins then slowly heat it. If it gets fairly warm and never lights up then switch to other pins and repeat. Once it does light record the temperature, then it should be fairly easy to find the pins for the internal heater.

Ohh and side note rhd: that package still hasn't arrived yet, weird right?

Last edited by benmwv; 07-23-2011 at 01:22 AM.
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Old 07-23-2011, 02:33 AM #54
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

benmwv:

- That is weird, in fact absolutely nothing I shipped last weekend (I shipped a dozen or so things) has reached anyone - even the stuff that was staying within Canada.

I have some shipping to do this evening (or maybe tomorrow depending on how quick I am at packaging), so I'll inquire if it's the same person working. They generally remember you when you ship 12 things at once
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Old 07-23-2011, 04:18 AM #55
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Well it's good to know it's not just me, I was starting to worry it was lost in the mail, or my senile mail lady had given it to someone else (which she does a few times a year).
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Old 08-11-2011, 07:54 AM #56
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Microvision Tracker: ShowWX Tear Down
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Old 08-11-2011, 03:36 PM #57
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

And of course he doesn't take apart the part we care about. heh.
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Old 08-11-2011, 05:37 PM #58
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Maybe Canada Post is on strike again :P
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Old 09-21-2011, 09:21 AM #59
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Hi, Here's a photo of the cavity of the green laser. It seems to be built on a silicon substrate. Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green-picoprojector_green.jpg
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Old 09-21-2011, 09:59 AM #60
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Hm ..... it look as a direct-coupled diode-crystal assembly, placed in a folded cavity ..... not sure about the electro-actuated optical element in the middle of the cavity, can be a piezo-drived etalon unit ? ..... like in the Fabry-Perot interferometers ? ..... just an idea, i'm not sure about this, anyway

Powering the diode chip (the two lower contacts) only, does it produce any green ?
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Old 09-21-2011, 10:36 AM #61
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Didn't fire it up yet... I think the laser has an optically pumped Nd:YVO or semiconductor gain medium. The nonlinear crystal is periodically poled (visible under microscope) and sits on top of a thin film heating element. The cavity end mirror seems to have a concave inner surface.
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Old 09-21-2011, 12:33 PM #62
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Then is probably an intracavity setup, with the 808-1064 directly coupled to the LD, and the doubler in the cavity (the concavity of the end mirror is probably focused in the center of the crystal, for better efficence) ..... is strange that there is no thermal sensing, together with the heating unit, anyway ..... wondering how they drive the assembly, during the normal working cycle, and how they can stabilize the temperature without a feedback, in this case .....
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Old 09-21-2011, 05:04 PM #63
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

So it isn't anything all that exotic, just a different cavity arrangement? Still see what I assume is an 808nm diode, a temp stabilized doubler, and a Nd:YAG or YVO4, but with an output mirror between the yag and the doubler?

Thanks for the pic, love seeing guts like this, it's like a puzzle!
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Old 09-21-2011, 08:02 PM #64
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Default Re: Harvesting / Teardown of the Pico1 Projector - 450nm, 640nm, + non-DPSS Green

Here's my best guess of the parts and the beam path.
Any ideas what's the part after the gain crystal?

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