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FrozenGate by Avery

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.....
 
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?
 
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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 ;)
 
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).
 
Hi, Here's a photo of the cavity of the green laser. It seems to be built on a silicon substrate. Picoprojector_green.jpg
 
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 :thinking:

Powering the diode chip (the two lower contacts) only, does it produce any 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.
 
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 .....
 
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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