Pic of my gutted 105 - Wheres the YAG?

[deezdrama05]

http://home.insightbb.com/~deezdrama05/IMAG0209.JPG

Heres a pic of my leadlight 105 gutted and everything in order that I pulled them out. Where is the YAG crystal? Is there a thin YAG film on one of the lenses or did I loose the yag crystal?

 

[LaserMod]

The crystal is inside the barrel, like this...erm better wait until I get the website back up. /ubbthreads/images/graemlins/smile.gif

 

[Arni]

The YAG is in the 3. pice (count from right). you can see on one side the big IR-filter and on the middle of the other side you see a very small (1mmx1mm) glas, fixed with a white glue. This is the YAG. And DO NOT take this out.

 

[liteglow]

i did take it out /ubbthreads/images/graemlins/smile.gif
Then i put all stuff togheter...

Then i got a sweet Nigh Wision pen to use on "night mode" on the Camcorder...

And yea sure the light will BURN up eyes, and u dont know it before it`s to late...

that`s wy i did take it apart again and never put it toghether again...

 

[deezdrama05]

I know the long rectangular cube that is inside the brass disc that has a slot, this is the ktp crystal right- the clear lens that is behind the ir filter I thought was the colomating lens. I see the ktp but not the yag the yag is a thin violet colored square-right? I dont see it.

 

[deezdrama05]

Is it right behing the glass lense on top of the ktp?

 

[deezdrama05]

My laser that used to be 65mw but is now only 20, after examining the insides magnified I believe its not the diode or MCA that is my problem. I believe my problem is in the driver circuit board. I have the same results with the 220 ohm resister and with it completeley off. So I bridged the gap with solder and still no difference. http://home.insightbb.com/~deezdrama05/IMAG0228.JPG
Its strange shouldnt the laser of not powered on with the 220 resistor tooken off? I still have the 3.3k resistor on back http://home.insightbb.com/~deezdrama05/IMAG0229.JPG
Anybody have any idea as why im not getting the full 65mw output that I was? Im still getting 20mw so I dont think the diode is bad, and after pulling off the 220 res. and it still powering on at 20mw this makes me think something in the circuit is screwed. I know your all tired of hearing about this laser but dont worry I have a couple more on the way so Ill have plenty of parts to play with.

 

[deezdrama05]

someone please help!!!!!!!! /ubbthreads/images/graemlins/banghead.gif /ubbthreads/images/graemlins/mecry.gif

 

[Spec]

you will not be able to see the faults in the ktp or yag block.

microscopic fractures man. disassembly looks to be your culprit here, have you double and triple checked the allignment of everything?

I know you dont want to hear it, but it could easily be your diode also, they have been known to dramatically decrease in output when the tolerances(still unknown) are exceeded, even for a moment.

 

[deezdrama05]

I havent removed any of the mca from there glued brass housing so I dont think I screwed them up, It may be the diode since I did put some stress on the driver board by pressing down on it too hard, I may have tempararily loosened a pin out of the diode and when I pushed it back it may have poped back into place but I may have tor off one of those hair thin wires from the diode chip or something. I will problly order a diode from ifixlasers.com but he says there max output is 390ma or am I mixing that up? It confuses my why diodes are rated by mw and ma at the same time.

 

[Spec]

[ QUOTE ]
deezdrama05 said:
he says there max output is 390ma or am I mixing that up? It confuses my why diodes are rated by mw and ma at the same time.

[/ QUOTE ]

Well they damn sure dont run on happy thoughts....

A = amperes; current, Lop in mA
W = watt; measurement of VA or calculated photonic emission, take your pick.

390mA is their midline operating current to produce a given number of mW laser output.

 

[LaserMod]

Ah, here it is:

Just a quick search on the forum found it a few times...

Original Thread

 

[Bengal]

Just for some information.
There is no YAG in leadlight pointers.
If there was there would be a much higher price on them.
The crystal used is "Vandate" for the short name.
Nd:YVO4 (Neodymium-doped Yttrium orthoVanadate)

 

[Raccoon]

Are you certain of this? /ubbthreads/images/graemlins/ooo.gif

 

[Bengal]

Yes, YAG is much more expensive and is used for higher power.
Vandate is more efficient, and cheaper.
But does not handle the higher power well.
The KTP is the same in most dpss lasers.
Thats why when you get above 100mw or so the price skyrockets.

Check out sams laser faq
http://repairfaq.ece.drexel.edu/sam/laserssl.htm#sslcav

Nd:YAG - Neodymium doped Yttrium Aluminum Garnet (Y3Al5O12). Another synthetic crystal. It is purplish/lavender in appearance and lases at 1,064 nm. This is near-IR but totally invisible and NOT eye-safe. Nd:YAG has been by far the most common solid state laser material - much more so than ruby - partly because its lasing threshold is much lower so more output energy is available for a given input.

Nd:YVO4 (Neodymium-doped Yttrium orthoVanadate) - This crystal, often just called "vanadate", is the material of choice in low to medium power (up to a few watts) diode pumped solid state (DPSS) lasers operating at 1,064 and 1,340 nm (or doubled to 532 and 670 nm) due to its large stimulated emission cross-section, low lasing threshold, and polarized output. See the additional comments in the next section.

 

[deezdrama05]

yeah I visited Cseles laser site last night and it answered alot of questions I had, they showed the cross section of a pointer and it shows that the ktp block has the vandate and mirror built into the block. Thats all I needed to know was where the yag or vandate was located and I guess its on the ktp the cube of ktp is a 3 layered block. |vandate|ktp|ocmirror| all in one block.

 

[Lasernerd]

Bengal is right on it!

 

[Arni]

I have the same problem with one of my new Laser yesterday. 50mW for a few minutes and the only 4mW forever with all kind of mod. (The diode takes 450mA). Changed the diode...4mW, changed the driverboard...4mW... Good buy Cristalls!!!! This is the last picture with 50 mWatt you can see there is something not OK !

But in this Laser the cristalls was very bad. When i switch it on it has 32mW (without any mod.!)after a half second it goes down to 7mw, but not every time.