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Old 09-19-2016, 12:03 AM #1
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Default ND YAG Breakdown Video

Interestingly soft spoken chap showing the innerds of a high power ND YAG while explaining how it works:



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Old 09-19-2016, 08:41 AM #2
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Default Re: ND YAG Breakdown Video

Nice informative video, thanks for sharing
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Old 09-21-2016, 08:28 AM #3
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Default Re: ND YAG Breakdown Video

Wish there was a ~800nm YAG, I guess it doesn't exist.
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Old 09-21-2016, 08:37 AM #4
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Default Re: ND YAG Breakdown Video

Maybe a new doping will come available in the future.
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Old 09-21-2016, 02:35 PM #5
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Default Re: ND YAG Breakdown Video

Ahh yes, Photonicinduction, great channel! He has an argon laser (ALC60) meltdown video too (and loads of other cool videos!). Pretty sure it was someone over on PL that sold him that YAG.
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Old 09-21-2016, 11:16 PM #6
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Default Re: ND YAG Breakdown Video

That's photonicinduction, I've been watching him a long time, check out his yt channel, he loves to break stuff.

Watch his trailer Below

>>>>> https://www.youtube.com/channel/UCl9...Xui-gRsnWjSrlA
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Old 09-23-2016, 09:29 AM #7
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Default Re: ND YAG Breakdown Video

He seems to be a very techno-scrappy fellow, thank you for the link. Yea, I guess 800nm YAG's or close to that wavelength aren't going to happen, if they haven't already been made. Maybe there isn't a need for them when we have 1064nm. Suppose a frequency doubled YAG at a longer wavelength landing at near 800nm might be more likely, I will keep searching, maybe one exists. I just want high peak pulsed power which lands in the shorter wavelength end of the Near-IR spectrum, shorter than 1um.
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"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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Old 09-23-2016, 07:31 PM #8
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Default Re: ND YAG Breakdown Video

I had the exact same YAG laser , unfortunately it suffered a lamp failure .


Did get a 80W run from it though .

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Old 09-23-2016, 07:42 PM #9
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Default Re: ND YAG Breakdown Video

Quote:
Originally Posted by DashApple View Post
I had the exact same YAG laser , unfortunately it suffered a lamp failure .


Did get a 80W run from it though .

0011 by TwirlyWhirly555, on Flickr
Yeah! Thought you had the same one! Was it just the lamp that failed or did it take out the YAG/Pump Chamber too?
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Old 09-23-2016, 07:46 PM #10
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Default Re: ND YAG Breakdown Video

Quote:
Originally Posted by diachi View Post
Yeah! Thought you had the same one! Was it just the lamp that failed or did it take out the YAG/Pump Chamber too?
Just the lamp failed , chamber and yag rod was in perfect condition when i sold the head , I still have the PSU and radiator though
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Old 09-24-2016, 11:38 PM #11
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Default Re: ND YAG Breakdown Video

Just saw this thread. I've watched this guy from time to time. He does come up with some new information for me occasionally. Thanks for sharing this, Alaskan. I can't rep you yet, but will get to you ASAP.
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Old 11-10-2016, 10:14 AM #12
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Default Re: ND YAG Breakdown Video

Paul, please let me know how you are doing when you are feeling better and back online.

Folks, I found this photo of a Continuum ND:YAG (NY81-10) which was listed on ebay and trying to understand what the unit was doing. I tried to find something about it online, but so far no joy. In the below photo, it appears the output of the front most YAG in the photo was feeding into another YAG, after a couple of turning mirrors. Might this be a seed driven setup? I believe this was 1064nm which may have been pumping a NL crystal for VIS 532nm green or UV output, not sure, many of the parts are missing including the Pockel cell to the left of the first YAG where you can see the HV driver leads hanging.



If no one has an idea, I will try contacting Continuum but thought I'd try here first.

Edit: Learned this since the post; Was a 1064nm to 532nm SHG pulsed laser at one time, but I don't understand why the two YAG's yet. Perhaps for wavelength stability? The SHG and perhaps THG section long gone, robbed from the box for something else. Both YAG's show electrical wiring to flash tubes, so both were flashed, but one feeding into the other one, why? Is it possible to feed one YAG's output through another YAG to increase total power, that reason alone is why?

Here is a photo of a Continuum laser very similar to this one I found on Wikipedia



Late Edit:

I think I understand what is going on with the two YAG configuration now, one YAG is an oscillator, the second the amplifier, see the screen shot below:

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Old 11-12-2016, 08:46 PM #13
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Default Re: ND YAG Breakdown Video

Quote:
Originally Posted by Alaskan View Post
Wish there was a ~800nm YAG, I guess it doesn't exist.
Get a ti:sapph

Quote:
Originally Posted by RedCowboy View Post
That's photonicinduction, I've been watching him a long time, check out his yt channel, he loves to break stuff.

Watch his trailer Below

>>>>> https://www.youtube.com/channel/UCl9...Xui-gRsnWjSrlA
Yes he does. Especially as I love his Arc light videos. I love xenon arc lamps.

Quote:
Originally Posted by Alaskan View Post
Paul, please let me know how you are doing when you are feeling better and back online.

Folks, I found this photo of a Continuum ND:YAG (NY81-10) which was listed on ebay and trying to understand what the unit was doing. I tried to find something about it online, but so far no joy. In the below photo, it appears the output of the front most YAG in the photo was feeding into another YAG, after a couple of turning mirrors. Might this be a seed driven setup? I believe this was 1064nm which may have been pumping a NL crystal for VIS 532nm green or UV output, not sure, many of the parts are missing including the Pockel cell to the left of the first YAG where you can see the HV driver leads hanging.



If no one has an idea, I will try contacting Continuum but thought I'd try here first.

Edit: Learned this since the post; Was a 1064nm to 532nm SHG pulsed laser at one time, but I don't understand why the two YAG's yet. Perhaps for wavelength stability? The SHG and perhaps THG section long gone, robbed from the box for something else. Both YAG's show electrical wiring to flash tubes, so both were flashed, but one feeding into the other one, why? Is it possible to feed one YAG's output through another YAG to increase total power, that reason alone is why?

Here is a photo of a Continuum laser very similar to this one I found on Wikipedia



Late Edit:

I think I understand what is going on with the two YAG configuration now, one YAG is an oscillator, the second the amplifier, see the screen shot below:

Yes. You can actually do this with the helium neon laser too. Actually done this with my Spectra-Physics 127 and my 120. Take the mirrors out of the 120, then run the 127 beam through it. Then turn on the 120. The power will go up a mW or two generally, despite the tube having no mirrors, as the beam passing through it'll create a limited amount of stimulated emission on its own and make the tube work as an amplifier.

Same thing can happen here as long is the delay between the two sides is accurate, creating a kind of cascade effect.
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588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

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641nm: Melles Griot RCS
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671nm: CNI PGL-III-C-100
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Last edited by ultimatekaiser; 11-12-2016 at 10:54 PM.
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Old 11-13-2016, 01:20 AM #14
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Default Re: ND YAG Breakdown Video

Alaskan, what would the use of an ~800nm YAG laser be?
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Old 11-13-2016, 05:31 AM #15
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Default Re: ND YAG Breakdown Video

UK, I'd like a Ti;Sapphire if I could find one surplus at the prices I can find for ND:YAG's. I recently came across the information the Sapphire rods can tune to 800nm, even shorter wavelengths into the red, but looking on ebay for rods, wow..... the few listed are $$$.

I just watched a MIT video showing how a gas laser can amplify, very cool. One of the things I'd like to know is the difference between an oscillator and an amplifier YAG, if they don't have mirrors built into them. Another thing I am trying to research is the amount of flash input power vs output for different diameters and length rods. Can't find a list showing some general rules of thumb yet.

Why? I am wondering if I find a big old surplus YAG and cavity with flash tubes if I can pulse the unit with far less flash tube power and then not need the huge liquid cooling system. This would just be for a few flashes, or if the YAG is able to take many flashes at relatively low intensity for what the unit was designed for when water cooled. I saw Styro had a video where a friend brought a YAG laser to his place and they were flashing it a few times without cooling.

Crazy, 800nm is easier to pick up on a camera, even with the IR filter removed 1064nm is probably only 1% the intensity to CCD cameras. I would love to take some photographs of the output of a YAG where a camera could really see the beam well.
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Each of these three rabbit holes go deep, ending up in the same place.

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Old 11-13-2016, 06:28 AM #16
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Default Re: ND YAG Breakdown Video

yeah. Ti:sapphs are expensive. last setup I saw was a good quarter mil. at least. filled a whole countertop. used a coherent Verdi as the pump, was 10 or 15W IIRC. crazy amounts of green...

You can probably underpump a YAG fairly easily, as they dissipate heat alot better than ruby does, and have a far lower threshold. but realistically its not worth it generally speaking. though I have seen people use a camera flash and a small yag to make a kind of mini yag laser. lots of possibilities if you get creative, though with those big 40W coherent diode bars, they're far more realistic and affordable and energy efficient. flash pumping is kind of a thing of the past now except in special circumstances. lamps are expensive and don't last long too.
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325nm: Omni 2056-M-A01 HeCd
375nm: Melles Griot RCS-007

405nm: Melles Griot RCS
430nm: Coherent D3 430-10
441.6nm: Omnichrome 2056-M-A01/4074-P-A03 HeCd laser
457.9nm: Argon Ion Line

472nm Omni-643RYB Whitelight Line
473nm: CNI MGL-473-100, CNI GLP-473
476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics >20mW Cyan DECSL Laser, Coherent Sapphire 488-20 OPSL

496.5nm: Argon Ion Line
501.7: Argon Ion Line
514.5nm: Argon Ion Line
520nm: Trustfire A8 Custom

532nm: CNI MGL-F-3W, Coherent Genesis MX Taipan OPSL, LG Hercules-325
543.5nm: 05-LGR-193 Melles Griot HeNe 3.8mW
Melles Griot LGB-563 HeNe

561nm: Melles Griot 85-YCA-015, Coherent Sapphire 561-20
568nm: Omni-643RYB Whitelight Line

577nm: Coherent Genesis MX Taipan OPSL
583.8nm: DPSS line
586.2nm: DPSS line
588.6nm: CNI PGL-M-80

591nm: DPSS line
593.5nm CNI MGL-H-50 Lab Laser
594.1nm: Coherent 31-2230-000 (4.5mW)

604.6nm: LOR-150 HeNe line
609nm: Raman HeNe line?
611.8nm: Melles Griot LOR-150 HeNe (5mW), LOR-006 HeNe (0.5mW)

632.8nm: Spectra Physics Model-127 (>35mW), Model-124B, Model-120, Model-117, others
Melles Griot LHB-580, LHB-190, WHR-570

641nm: Melles Griot RCS
647nm: Omni-643RYB Whitelight Line
659.6nm: Laser Quantum IGNIS DPSS laser 0.5W

671nm: CNI PGL-III-C-100
676nm: Omni-643RYB Whitelight Line
690nm: custom diode laser
694nm: Portable Q-switched Ruby Laser

1152.6nm: SP-120 HeNe alt. mirrors
1523.5nm: Melles Griot LIR-151 HeNe
3391nm: SP-124 alt. mirrors
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