Disassembly of a 589nm laser PGL-III-A (PIC HEAVY)

[Deleted member 17304]

Re: Disassembly of a 589nm laser PGL-III-A

Hm. Maybe they set the process up differently for the smaller versions? From my source, a III-C module has the two crystals bonded together somehow.

*shrugs* I dunno. This module should have the same setup...

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I've never heard of Nd:YVO4 doing either 1319nm or 1347nm. You sure you got your facts right? It has a 1342nm line...

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

what do you mean? it is taking an input of 808nm. if it was two crystals bonded in the middle then they are considered a single structure. with a substrate in the middle effectively.

Edit: the 808 would go through the whole crystal, and the 1064 would use the whole cavity length (crystal length) and the 1319 would use the second half of the cavity length most likely, since it is lower gain, and you'd want it going through less material.

 

[crazyspaz]

Re: Disassembly of a 589nm laser PGL-III-A

what do you mean? it is taking an input of 808nm.

sorry! I was still thinking it was 2 seperate crystals. Derp.

I just cant figure out how one crystal can lase two lines...maybe thats why they have such crap efficiency, cant imagine it works very well.

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

edited my above post. even if it was two crystals it would still work fine

 

[The Lightning Stalker]

Re: Disassembly of a 589nm laser PGL-III-A

Are you able to identify the optic in front of the diode? I've been wanting to try a 532nm build and so far
this is the only thing I'm not sure about.

Multiple lines lasing in a single crystal is no feat, AFAIK. Gas lasers do it no problem. It's all in the
coatings. It's only a matter of having enough energy input to get multiple lines lasing at the same time.
The hard part would be getting equal output on both lines because the 1064 line is so strong. It wouldn't
be necessary to get a perfect balance, though the extra photons would go to waste.

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

You are absolutely right.

and the optic doesn't appear to be special, but has a very round high focal length, suggesting its gathering up the 808 to force it through the YAG like I drew

 

[The Lightning Stalker]

Re: Disassembly of a 589nm laser PGL-III-A

When you say "high" focal length do you mean short focal length?

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

yes. we're dealing with very small spaces, a few mm focal distance. its very thick and round on one side, and pretty flat on the other, so I'm not sure exactly. I cant really get a good pic of it due to it being inside the positioning ring. almost looks like a marble in the ring from the output side.

 

[LtKernelPanic]

Re: Disassembly of a 589nm laser PGL-III-A

Sounds like it. They have a similar structure I think too. Would you like me to dig it out? Problem is a new diode means a new alignment

I may have to take you up on that later. I don't have any spare cash at all right now so getting a new diode isn't even a possibility right now. The thought of realigning the thing is scary as hell though.

EDIT: after i think about that, b-mounts would be a PITA to use in handhelds. I just figured c-mounts would be too big for pointers, although i have never seen one of CNI's pens in person so i dont know the actual size...

CNI's 589 GLPs use a 500mw 808nm (IIRC) c-mount diode. They had to trim at least one corner of the diode to make it fit. I'm guessing they have to carefully file it by hand. I forget who it was but someone posted pics of the inside of a CNI 589 module.

I don't have mine handy but size wise they're about the same length as your standard fleabay pointer but have a diameter slightly larger than the CR2 battery they use.

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

I may have to take you up on that later. I don't have any spare cash at all right now so getting a new diode isn't even a possibility right now. The thought of realigning the thing is scary as hell though.

Sure, just let me know. I can even give all the optics a good clean if they need it. I had to remove a blemish from the YAG anyway, which i suspect was lowering the output power. it was smack dab in the middle. possibly from assembly, its good as new now. I'm actually cleaning out a couple of my 3 element lenses as we speak, they got some dust between them somehow.

CNI's 589 GLPs use a 500mw 808nm (IIRC) c-mount diode. They had to trim at least one corner of the diode to make it fit. I'm guessing they have to carefully file it by hand. I forget who it was but someone posted pics of the inside of a CNI 589 module.

I don't have mine handy but size wise they're about the same length as your standard fleabay pointer but have a diameter slightly larger than the CR2 battery they use.

yeah that would make sense. alot of high power DPSS uses C-mounts or open can packages. They're far easier to use, because you can get the optics much closer to the actual diode because they don't have a Can around them, conserving your losses and ensureing as much of the light goes through as possible.

 

[The Lightning Stalker]

Re: Disassembly of a 589nm laser PGL-III-A

Well :thanks: that helps a lot even without a pic. It sounds like a very SFL plano-convex.

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

its just gathering all the light it can out of the 808 C-mount cavity to send it on to the Nd: YAG it would make sens that it has to be really close to the crystal while being very wide angle to get all the light it can and push it through such a tiny space immediately in front of it. its collimating light from a cavity behind it that probably about 3-4 times its own diameter.

 

[djQUAN]

Re: Disassembly of a 589nm laser PGL-III-A

alot of high power DPSS uses C-mounts or open can packages. They're far easier to use, because you can get the optics much closer to the actual diode because they don't have a Can around them, conserving your losses and ensureing as much of the light goes through as possible.

I had a 532 pen back then that had an open can 5.6mm diode and the crystal was right up against the diode die.

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

I had a 532 pen back then that had an open can 5.6mm diode and the crystal was right up against the diode die.

yes, this is to ensure as much of the 808nm is used as possible. this limits waste, and helps control excess heat in the cavity, as well as backfeed to the diode. (both bad )

It also helps to set the diode's natural polarization to the YAG. helping you to create a fixed, stable, and properly polarized output from the YAG/Vanadate. The polarization coming from the vanadate wil dictate the positioning and rotation of the KTP afterwards to allow the photons passing through it to interact with one another and create the new output, using the crystal as the gain medium typically.

 

[Deleted member 16589]

Re: Disassembly of a 589nm laser PGL-III-A

NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO Why kill such a beautiful laser. :cryyy:

I cringed when you Removed the OC. That alone will be a pain for you to realign then you go and remove the crystals. Are you trying to give us a stroke. Hope you didn't loose the orientation of those Crystals.

Any way your sacrifice :tinfoil: was not a waste I have always wondered how these were build it the inside.

+1 for you

 

[ultimatekaiser]

Re: Disassembly of a 589nm laser PGL-III-A

NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO Why kill such a beautiful laser. :cryyy:

I cringed when you Removed the OC. That alone will be a pain for you to realign then you go and remove the crystals. Are you trying to give us a stroke. Hope you didn't loose the orientation of those Crystals.

Any way your sacrifice :tinfoil: was not a waste I have always wondered how these were build it the inside.

+1 for you

Lol, didn't you read it? It was already dead and misaligned, that's why I took it apart. I know how to do DPSS. It's not too big of a deal, but there's no easy way to put this back together as it was. I Might rebuild the cavity externally sometime.