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Old 09-04-2017, 02:48 PM #1
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Default Interesting Lab YAG laser (Disassembly)

At SELEM I bought this 1987 YAG laser from Alex. I don't think he tested it at all, so really nothing was known about it.

It has hose connectors for water cooling and indicates that it should not be run without water flowing. One place selling an almost identical laser lists it as 600mW @ 1320nm.

So naturally, after I powered it up and nothing happened, I opened up the laser. You can see in the first attached picture. I was surprised to see that the pumping source in an 500W halogen incandescent lamp. I didn't know you could pump a YAG this way. The water cooling only cools the YAG rod.

I believe that this laser is missing the HR mirror, though aside from that everything looks to be there (the reason it didn't run at first was because the interlock doesn't have the right pins shorted).

Just thought I'd share an interesting laser. I was quite surprised to find a halogen bulb in a laser.


EDIT: Upon further research it looks like it may be possible for me to use a aluminum FS mirror for the HR. As best as I can tell the OC is planer and from Sam's FAQ it seams it indicate that most lasers like this have a planer-planer mirror configuration. It looks like aluminum has a reflective of around 95% at 1.3 um range and since this is a CW laser I won't have to worry about ablating the mirror coating. I guess the question would be whether the laser could reach lasing threshold with the additional 5%+ losses?
Attached Thumbnails
Interesting Lab YAG laser (Disassembly)-20170904_103156-800x450-.jpg   Interesting Lab YAG laser (Disassembly)-20170902_170145-800x450-.jpg   Interesting Lab YAG laser (Disassembly)-20170904_103205-800x450-.jpg   Interesting Lab YAG laser (Disassembly)-20170902_171142-800x450-.jpg   Interesting Lab YAG laser (Disassembly)-20170902_170358-800x450-.jpg  



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Noteworthy Lasers and λ's:
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660nm: 230mW LPC-826
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632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
473nm: ~ 5mW B&W Tek
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
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405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector & 2.5W 532nm Halfnote, 1320nm YAG, SSY-1.

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Last edited by Mattronium; 09-04-2017 at 06:27 PM.
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Old 09-04-2017, 03:18 PM #2
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Default Re: Interesting Lab YAG laser (Disassembly)

Yow, I like the looks of that thing, very nice. I hope you get it running, if 1320 maybe make some 589 nm with it? If you can find the right crystal and the missing mirror.
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Old 09-04-2017, 04:36 PM #3
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Default Re: Interesting Lab YAG laser (Disassembly)

Yes, quite a number of high power Nd:YAG's are pumped by flashlamp. Its nothing surprising at all. In fact, the first ever laser was a solid state (ruby) and was pumped by a flashlamp. You either side pump by flashlamps or side/end pump using 808 LD's.
I believe they are either krypton or xenon filled for YAG's.





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Last edited by CurtisOliver; 09-04-2017 at 04:39 PM.
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Old 09-04-2017, 04:52 PM #4
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Default Re: Interesting Lab YAG laser (Disassembly)

Quote:
Originally Posted by CurtisOliver View Post
Yes, quite a number of high power Nd:YAG's are pumped by flashlamp. Its nothing surprising at all. In fact, the first ever laser was a solid state (ruby) and was pumped by a flashlamp. You either side pump by flashlamps or side/end pump using 808 LD's.
I believe they are either krypton or xenon filled for YAG's.

That's the thing. It is NOT pump by either a flash lamp or a diode.

If you look at the last attached image you can see the pumping source. What looks to be a common incandescent halogen light bulb. Although I would say that this bulb has had quite a bit of use.

I didn't find very much information about Halogen pumped YAG lasers, though there are a few times that they are mentioned in Sam's FAQ:
https://www.repairfaq.org/sam/laserssl.htm#sslops
Another YAG that uses halogen lamp pumping: https://www.repairfaq.org/sam/laserpic/cviypics.htm

A quote from Sam's site "A very few commercial SS lasers have used common halogen lamps (and lots of cooling!) for pumping and even the Sun and chemical reactions which produce light have been used in the laboratory but these are extremely inefficient."

A post here: A technical doubt - ND-YAG laser pumped with halogen ?



Quote:
Originally Posted by Alaskan View Post
Yow, I like the looks of that thing, very nice. I hope you get it running, if 1320 maybe make some 589 nm with it? If you can find the right crystal and the missing mirror.
It sure would be nice to get it running simply from a historical perspective. Although I don't know how easy it will be to find the proper HR mirror for 1320nm. Assuming it is 1320nm at all! There really is almost no information on this that I can find. I highly doubt making 589nm would even be possible, even doubling it to 660nm might be impossible. Not that I would try it, just getting it working will be fine for me.
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Mattronium's Laser Collection (with links to build threads etc.)

Noteworthy Lasers and λ's:
1064nm: SSY-1
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad, ~7mW Mini-SS AAA size pen.
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
473nm: ~ 5mW B&W Tek
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector & 2.5W 532nm Halfnote, 1320nm YAG, SSY-1.

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Last edited by Mattronium; 09-04-2017 at 06:12 PM.
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Old 09-04-2017, 05:13 PM #5
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Default Re: Interesting Lab YAG laser (Disassembly)

Well, it is still a flashlamp. Although it doesn't look too healthy. Does anyone know if the pump source is ok?
If it is indeed halogen then it is an odd one I admit.
Thanks for sharing with us.
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If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
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Sanwu are known to be very high quality and every newcomer should check them out.
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Bang good is a good source for many electrical items and are often cheap and reliable.
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Last edited by CurtisOliver; 09-04-2017 at 05:13 PM.
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Old 09-04-2017, 08:15 PM #6
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Default Re: Interesting Lab YAG laser (Disassembly)

That lamp looks like it has quite a bit of solarization. Seems to have had a hard life.
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Old 09-04-2017, 08:37 PM #7
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Default Re: Interesting Lab YAG laser (Disassembly)

600 mw of CW sure doesn't impress, but if that's all you need, that's all you need. What is the rod diameter and length?
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Old 09-04-2017, 10:29 PM #8
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Default Re: Interesting Lab YAG laser (Disassembly)

Without looking at it now, (packed it away for now), I would have to say it is about 2mm x 50mm. It is hard to say without opening up the cavity, which I probably should do sometime just to check the rod and make sure everything looks good.
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Laser Safety Information

Mattronium's Laser Collection (with links to build threads etc.)

Noteworthy Lasers and λ's:
1064nm: SSY-1
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad, ~7mW Mini-SS AAA size pen.
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
473nm: ~ 5mW B&W Tek
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector & 2.5W 532nm Halfnote, 1320nm YAG, SSY-1.

"Fiat Lux" - preferably laser light.

Last edited by Mattronium; 09-04-2017 at 10:30 PM.
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Old 09-05-2017, 07:24 AM #9
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Default Re: Interesting Lab YAG laser (Disassembly)

That's about the size of a "SSY-1" rod which is Q-switched. I can understand why the CW power would be 600 mw, especially if pumped by a Halogen lamp. At that power level, you don't need an arc lamp, nor would you want to use one if a Halogen could be used to produce the power needed.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"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.

Useless troll fighting.
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Old 09-08-2017, 01:51 AM #10
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Default Re: Interesting Lab YAG laser (Disassembly)

So I'm curious as to how much one of these lasers might be worth if working? (for considering how much $ it is worth to spend on repairs)
So my question to everybody is, What would you pay for a laser like this that is working? (assuming it is 1320nm and 600mW).

EDIT: So I opened the reflecting up and everything did indeed look good. Also, the YAG rod is actually closer to 35mm long.
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Noteworthy Lasers and λ's:
1064nm: SSY-1
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad, ~7mW Mini-SS AAA size pen.
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
543.5nm: 3.1mW Coherent HeNe
537nm / 542nm / 545nm / 550nm multi-line DPSS +/- 1nm
532nm: 500mw CNI PGL-III-C
515nm: 36mW laserBtB
503nm SB1573N91 Assembly in progress...
514.5nm/501.7nm/496.5nm /488.0nm/476.5nm/457.9nm 2214-40MLA Argon Ion
475nm: 50mW-80mW Assembly in progress...
473nm: ~ 5mW B&W Tek
462nm: 2W M462 Kryton Groove
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser & DIY laser projector & 2.5W 532nm Halfnote, 1320nm YAG, SSY-1.

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Old 09-09-2017, 06:41 PM #11
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Lightbulb Re: Interesting Lab YAG laser (Disassembly)

Quote:
Originally Posted by Mattronium View Post
At SELEM I bought this 1987 YAG laser from Alex. I don't think he tested it at all, so really nothing was known about it.

It has hose connectors for water cooling and indicates that it should not be run without water flowing. One place selling an almost identical laser lists it as 600mW @ 1320nm.

So naturally, after I powered it up and nothing happened, I opened up the laser. You can see in the first attached picture. I was surprised to see that the pumping source in an 500W halogen incandescent lamp. I didn't know you could pump a YAG this way. The water cooling only cools the YAG rod.

I believe that this laser is missing the HR mirror, though aside from that everything looks to be there (the reason it didn't run at first was because the interlock doesn't have the right pins shorted).

Just thought I'd share an interesting laser. I was quite surprised to find a halogen bulb in a laser.


EDIT: Upon further research it looks like it may be possible for me to use a aluminum FS mirror for the HR. As best as I can tell the OC is planer and from Sam's FAQ it seams it indicate that most lasers like this have a planer-planer mirror configuration. It looks like aluminum has a reflective of around 95% at 1.3 um range and since this is a CW laser I won't have to worry about ablating the mirror coating. I guess the question would be whether the laser could reach lasing threshold with the additional 5%+ losses?
Actually, your eyes don't deceive you. The Yag 2 lasers from the 1980s are CW and do in fact use a special high temperature quartz lamp as the pumping source. We had 2 or 3 at Uvic that are now long gone.
So, yes that's indeed what it is.... btw, There are several retrofits that can be done to make this laser more efficient.
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532nm 10mW-15mW DPSS Module IR filtered(S.Korea)RyanSoh3 Class IIIb
450nm CarbonFiber ElectricPlasma build 9mm +6W Class IV
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405nm Daguin Kryton Groove SO6J 700mW build. Class IV
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Last edited by Seoul_lasers; 09-09-2017 at 06:43 PM.
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