Old 11-29-2013, 02:48 AM #1
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Default Refinish a Yag rod?

Who polishes and recoats NdYag rods? I have one which
needs a job on one end. It got a little crap burned onto it.
As I recall, it has ~ 2 Deg angle on it. Try to keep it low $.
HMike

The big rod is ~ 6" x 3/16" -- I have another 5 mm x 90 mm
with a small pit at one end but at the very edge.


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Old 11-30-2013, 01:32 AM #2
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Default Re: Refinish a Yag rod?

BUMP -- Someone still makes NdYag rods.
They must know how to refinish an end.
HMike
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Old 11-30-2013, 07:31 AM #3
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Default Re: Refinish a Yag rod?

I don't think it can be done non-commercially. :/ I've never heard of an in-home solution to this. once the optical surface is destroyed its permanent unless you regrind it smooth again, which would alter the length of the rod and then it would have to be re-coated as well...are you sure it can be done mike?

Edit: maybe try getting a quote from http://www.cascadelaser.com/opre1.html
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Old 11-30-2013, 09:01 PM #4
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Default Re: Refinish a Yag rod?

The pits are tiny burn marks.
It will need to be polished off and a new AR coating
applied. This rod has about 2 Deg face angles.
I believe they were called Bruester angles.
Thanks -- HMike
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Old 11-30-2013, 10:08 PM #5
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Default Re: Refinish a Yag rod?

That would make sense but I reiterate that if it doesn't come off with a chemical rinse the ultrasonic cleaning is the next best step. After that it needs a resurface. The optical surfaces are very fragile. Can you get a good picture? I've done some yag cleaning, but generally it's a no go. You can't handle them bare handed, and the surfaces degrade on contact with literally anything. Touching them short of a resurface will damage them permanently
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Old 11-30-2013, 10:42 PM #6
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Default Re: Refinish a Yag rod?

Ulti.... -
I built this laser ~25 years ago. I mounted the rod in
black O-rings which splattered all over from the heat
of the flash tubes. It is possible the spots can be
removed with Freon solvent.
I have been afraid to fire it again because the damage
would get worse.
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Old 11-30-2013, 11:23 PM #7
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Default Re: Refinish a Yag rod?

Ah! Ok well that I didn't know. You hadn't told us that, I was under the impression there was actual damage to the rod itself. What is it coated for? Most yag rods I wash with lab acetone. It can dissolve rubber slowly. Perhaps that would work? I know hydrocarbons do as well but the impurities probably would be bad for the rod/coatings?
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Old 12-01-2013, 02:46 AM #8
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Default Re: Refinish a Yag rod?

I'll try the acetone wash first.
I hate to take it apart and loose
alignment. HMike
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Old 12-01-2013, 03:20 AM #9
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Default Re: Refinish a Yag rod?

I know what you mean. I rinse a glass beaker with distiller water and then fill it with lab grade acetone and let suspend the end of the rod in the acetone and let sit for a while, possibly with the occasional swirl for stubborn debris. This lets gravity pull the gunk off without touching the end to anything. If you see progress I'd change out the acetone after a bit to make sure nothing suspended in it is in for a revisit. The rod is pretty tough, but the coatings are very easy to damage.
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Old 12-05-2013, 06:07 AM #10
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Default Re: Refinish a Yag rod?

There's a couple little spots where the O ring
splattered from the flash tube heat. Thanks for
the acetone suggestion.
HMike
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Old 12-05-2013, 06:12 AM #11
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Default Re: Refinish a Yag rod?

no worries, thats how I clean most non acrylic optics with softer coatings, since they scratch easy. it tends to do the trick best, short of ultrasonics. sometims adding a little methanol to the mix helps dissolve a few things that the acetone won't, and then it can bet rinsed in pure acetone to prevent streaks. just depends on what it's made of and how much effort you want to put into cleaning it. I dont have a PSS YAG, but I've cleaned and re-aligned my friend's a few times. let me know how it turns out and good luck!
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476.5nm: Argon Ion Line

483nm Omni-643RYB Whitelight Line
488nm: Argon Ion Line, Spectra Physics Cyan 488-20 DECSL, 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: 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 561-100
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

Last edited by ultimatekaiser; 12-05-2013 at 06:13 AM.
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