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Old 06-11-2011, 02:02 PM #1
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Default Melles Griot Co2 Laser

Howdy ya'll.
I picked up this Co2 laser head from an auction a few weeks ago. There was a photo of it working at some point, and it seems to be in good cosmetic condition, but came with not information except that it could be powered by a 250 watt Linear amplifier of some sort....

I have found one video online showing it in use, aside from that I have no information as of yet.
http://www.youtube.com/watch?v=l4CKn8KqtzY&feature=player_embedded

If anyone could steer me in the right direction as far as powering it and what I'm looking at as far as the connections, it would be of great help.

I'v looked through Melles Griot's web site and found nothing, and the web hasn't given much yet as well.

Here are some photo's of the tube, perhaps if anyone can identify the inputs and perhaps what I should use to power it.
I do know the in and out are for the water cooling and from my understanding a simple fish tank pump should do the trick for that.
I also hear that a neon sign transformer can be used with these, or perhaps a Chinese PSU from ebay...

Thanks for any information ya'll might have or links that you've collected over the years.

[IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]


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Last edited by 532 with Envy; 06-11-2011 at 02:41 PM.
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Old 06-11-2011, 03:32 PM #2
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Default Re: Melles Griot Co2 Laser

Please tell me that's not the same guy you bought it from. The OC is probably ruined after the stunts he pulled.

It's RF driven in the MHz range (27.1MHz by one account but I'm not sure this value is critical and may vary between models), so that's the kind of amplifier you need. Hemlock_Mike would probably know more.
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Old 06-11-2011, 03:47 PM #3
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Default Re: Melles Griot Co2 Laser

Quote:
Originally Posted by Cyparagon View Post
Please tell me that's not the same guy you bought it from. The OC is probably ruined after the stunts he pulled.

It's RF driven in the MHz range (27.1MHz by one account but I'm not sure this value is critical and may vary between models), so that's the kind of amplifier you need. Hemlock_Mike would probably know more.
It is who you think....I got it for $10 and thought it would be worth a try.
Thanks for the info, i'll see if I can find a amplifier and post a link of what I find.
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Old 06-13-2011, 12:28 AM #4
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Default Re: Melles Griot Co2 Laser

Hey that's a fascinating piece of hardware, I didn't know MG even made CO2 lasers.

CB radios operate around 27 MHz so a linear amp designed for that and driven by a simple oscillator ought to work to power the laser. I know I've seen circuits out there on the 'net for (illegal) CB linear amps that are not terribly complex.
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Old 06-13-2011, 01:10 AM #5
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Default Re: Melles Griot Co2 Laser

That is completely different then the others I have seen. All the CO2 units I have seen are bare tubes. Good luck with finding the right PS for it. It should be a very interesting "toy" if you can get it fired up.
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Old 06-13-2011, 04:27 PM #6
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Default Re: Melles Griot Co2 Laser

Call Melles Griot and ask for " PM SENT" in Gas Lasers at Carlsbad.

If he has not retired yet.

I'd post his name but it is not wise that he be flooded with requests.


There are other frequencies used for ISM unlicensed emitters, 27.125 is the main one, which is CB Channel 14. 13.56 Mhz and 40.680 Mhz come to mind. Since a mismatched load (High VSWR) will strain or blow most RF amps, it is wise to find out what it is designed for, or at least probe it at low power with a directional coupler or SWR meter.

Steve

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Old 06-13-2011, 07:58 PM #7
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Default Re: Melles Griot Co2 Laser

Quote:
Originally Posted by LSRFAQ View Post
Call Melles Griot and ask for " PM SENT" in Gas Lasers at Carlsbad.

If he has not retired yet.

I'd post his name but it is not wise that he be flooded with requests.


There are other frequencies used for ISM unlicensed emitters, 27.125 is the main one, which is CB Channel 14. 13.56 Mhz and 40.680 Mhz come to mind. Since a mismatched load (High VSWR) will strain or blow most RF amps, it is wise to find out what it is designed for, or at least probe it at low power with a directional coupler or SWR meter.

Steve


Thanks for the connection, and all for the help. I'v been trying to put it together before I contacted MG just because I can only figure they don't like getting call's from people like me....non-researching...non-professional....non-paying
If it comes down to it and I can't find a matching power supply on the open market for the unit I'll give them a call though.
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Old 06-14-2011, 05:57 PM #8
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Default Re: Melles Griot Co2 Laser

[QUOTE=532 with Envy;922647]Thanks for the connection, and all for the help. I'v been trying to put it together before I contacted MG just because I can only figure they don't like getting call's from people like me....non-researching...non-professional....non-paying

NOT So, Melles is very professional about such things, you are a "future" customer to them. Often they are curious if the laser is still working.

Steve
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Old 06-14-2011, 10:02 PM #9
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Default Re: Melles Griot Co2 Laser

Wow, that's a neat little set up. Hope you can one again get her to lase, for $10.00 I guess it's hard to go wrong.
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Old 06-25-2011, 01:15 AM #10
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Default Re: Melles Griot Co2 Laser

Wow, heh. I'd kill for a cylindrical MG CO2 like that...
I do have a 1.5kW linear amplifier, and a few 100w transmitters that'll do 27mhz.
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Old 06-25-2011, 01:50 AM #11
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Default Re: Melles Griot Co2 Laser

Quote:
Originally Posted by aryntha View Post
Wow, heh. I'd kill for a cylindrical MG CO2 like that...
I do have a 1.5kW linear amplifier, and a few 100w transmitters that'll do 27mhz.
Sent you a PM....
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Old 07-05-2011, 07:09 PM #12
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Default Re: Melles Griot Co2 Laser

Make sure it has water cooling the tube or the tube will overheat and die. Apply 27.1mhz with a CB linear amp at 150 to 250W. Watch it burn stuff. The OC is fine, it was protected by a window for the burning demos.
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Old 07-05-2011, 09:00 PM #13
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Default Re: Melles Griot Co2 Laser

Ok. It's currently in my lab right now; so the questions:

Water flow rate. Would an aquarium pump be OK? Or do I need more flow.

Should I split the cold water (input) and output water reservoirs? Or can I recirculate the water?

Nothing has to be done with the little 4 pin connector in the back? Just apply 150-250w at 27.1mhz to the coax, and I should get a CW output?
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488nm:Nlx DPSS 7mW ∙ JDS 2214 ArI 40mW ∙ JDS FCD488 DPSS 25mW
ML:MG 65A106025 ArI ML 115mW
476/480nm:Nichia Diode 28mW
473nm:PGL3A 45mW(80pk) ∙ PGL3C 110mWpk ∙ PGL3C 95mWpk ∙ RPLB-25 60mWpk
465nm:DTR NDB7676 2.03w
458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
452nm:Osram SM 47mW
445nm:Yob 1410mW ∙ Polaris 156mW ∙ PGL3C 1200mW ∙ DTR-EHG 32650 2136mW
405nm:Yob 630mW ∙ Qfox 750mW ∙ JETL PLC 780mW
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Old 07-05-2011, 09:12 PM #14
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Default Re: Melles Griot Co2 Laser

Quote:
Originally Posted by aryntha View Post
Ok. It's currently in my lab right now; so the questions:

Water flow rate. Would an aquarium pump be OK? Or do I need more flow.

Should I split the cold water (input) and output water reservoirs? Or can I recirculate the water?

Nothing has to be done with the little 4 pin connector in the back? Just apply 150-250w at 27.1mhz to the coax, and I should get a CW output?

I'm pretty sure any small aquarium pump will work for it. and also you can use a 5 gallon bucket and just recirculate the water. From what I understand, unless you have it running at full power for hours and hours and hours, you should be okay.
The electronics are all you
Good luck and have some good safe fun.
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Old 07-05-2011, 09:24 PM #15
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Default Re: Melles Griot Co2 Laser

Sure thing 532. Was seeing if heruur maybe knew more about the pins on the back. Will give it a shot here shortly.

Anyone know what wl of glasses I should be wearing before I give it an attempt?

Somewhere betwen 9400-10600 I'm guessing... The scatter from this must be unreal.... I likely should acquire those before making any attempts; I'll make sure real quick that none of my existing IR goggles don't cover that.
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808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
780nm:OLIKE 120mW
685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
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589nm:CNI PGL3C 106mW ∙ CNI PGL3C 85mW
561nm:CNI PGL3C 30mW(41pk)
556nm:CNI PGL3C 20mW(22pk)
544nm:JDS1675P HeNe 2mW ∙ REO LHGR 2mW ∙ Lasos 7786 2mW
532nm:PGL3C 150mW(180pk) ∙ PGL3C 578mWpk ∙ PLC 440mWpk
515nm:JDS 221420GL ArI 30mW
510nm:52mW DG#2 ∙ 50mW 26650 DG
488nm:Nlx DPSS 7mW ∙ JDS 2214 ArI 40mW ∙ JDS FCD488 DPSS 25mW
ML:MG 65A106025 ArI ML 115mW
476/480nm:Nichia Diode 28mW
473nm:PGL3A 45mW(80pk) ∙ PGL3C 110mWpk ∙ PGL3C 95mWpk ∙ RPLB-25 60mWpk
465nm:DTR NDB7676 2.03w
458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
452nm:Osram SM 47mW
445nm:Yob 1410mW ∙ Polaris 156mW ∙ PGL3C 1200mW ∙ DTR-EHG 32650 2136mW
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Last edited by aryntha; 07-05-2011 at 09:25 PM.
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Old 07-05-2011, 10:40 PM #16
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Default Re: Melles Griot Co2 Laser

^^^ You should be safe with most any type of clear plastic safety goggles, that wavelength cannot pass through regular glass or plastic! ( At least very quickly! )
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