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PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please sub

Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

paul1598419 said:
Shipping in the U.S. is not cheap either. I think he's trying to make a profit on the shipping as well.
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Either that or he's crating it and shipping it with decent protection, which I doubt. If anyone is seriously considering buying it I would ask how he intends to ship it first.
 





Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

My argon was packed well and shipped from basically the same area and cost a third of his shipping costs. It was larger too.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Seller responded to my shipping cost question:


New message from: red5conan (189Turquoise Star)

The high shipping cost takes into account a very rigid and well packed package to ensure head does not get broken or thrown out of alignment. It also has to do with the weight and your geographic location (ebay calculates). I am really hoping that I can find someone locally and take it to them. I really don't want to hassle with packing this system up.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I'm becoming interested in YAG's and found this Q-Switch plate on ebay, I've tried to contact the seller asking if these are made for specific wavelengths, but no answer. The second photo of the glass shows a drawing of a Ruby YAG on it which makes me believe perhaps these plates are for red wavelength, does anyone know if Q-Swtich plates like this are typically broadband enough to use for ND:YAG 1064nm?

Laser Q Switch Glass 3" x 3" x 1 8" Thick | eBay
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Alaskan said:
I'm becoming interested in YAG's and found this Q-Switch plate on ebay, I've tried to contact the seller asking if these are made for specific wavelengths, but no answer. The second photo of the glass shows a drawing of a Ruby YAG on it which makes me believe perhaps these plates are for red wavelength, does anyone know if Q-Swtich plates like this are typically broadband enough to use for ND:YAG 1064nm?

Laser Q Switch Glass 3" x 3" x 1 8" Thick | eBay
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I think you have combined two laser rod types, as a ruby is 0.5% to 1% chromium doped Al2O3 and YAG is yttrium aluminum garnet and is ND doped. This appears to be a passive Q switch for a ruby laser. As such, it is placed between the rod and the HR mirror. It would be a good buy if you wanted a Q switch for a ruby laser build. I never heard of them being used for a YAG build, but that doesn't mean it can't be done. I wonder if the seller would even know the answer to this question.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Ooops, you are right, a ruby rod is synthetic ruby, a YAG another thing, knew that, but used YAG anyway. Well, I can say this, the SSY1 has a passive Q switch and it is a ND YAG. Not sure if a passive Q switch plate is made for a narrow range of wavelengths or not. If I can use this, I might make an offer. Anticipate working with ND YAG in the future.
 
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Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

I have a couple already, but have been looking at some larger ND YAG lasers on ebay which can do about 250 mJ, but the one I found does not have a Q switch
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Alaskan said:
Ooops, you are right, a ruby rod is synthetic ruby, a YAG another thing, knew that, but used YAG anyway. Well, I can say this, the SSY1 has a passive Q switch and it is a ND YAG. Not sure if a passive Q switch plate is made for a narrow range of wavelengths or not. If I can use this, I might make an offer. Anticipate working with ND YAG in the future.
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Sounds like an interesting project. Good luck with it, and let us know how it turns out. :D
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

YAG lasers open up a whole new vista of photonic technology for me, interesting indeed.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Alaskan said:
I'm becoming interested in YAG's and found this Q-Switch plate on ebay, I've tried to contact the seller asking if these are made for specific wavelengths, but no answer. The second photo of the glass shows a drawing of a Ruby YAG on it which makes me believe perhaps these plates are for red wavelength, does anyone know if Q-Swtich plates like this are typically broadband enough to use for ND:YAG 1064nm?

Laser Q Switch Glass 3" x 3" x 1 8" Thick | eBay
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Just so you know, a passive Q-switch like this IS going to be wavelength dependent. In a ruby cavity with no Q-switch, you pump the rod and it will begin lasing during the flashlamp pulse once it achieves a population inversion, and will continue to lase throughout the pulse (actually you'll see a train of pulses, but that's beside the point.) The initial lasing comes from when a little bit of fluorescence light from the rod bounces between the mirrors and gets amplified.

Now if you throw an optic like this in the cavity, it acts as a "saturable absorber" and it will absorb all of that initial light produced by the rod, which means there is no light to bounce around in the cavity to get amplified. This allows the crystal to become more and more energized without losing energy due to lasing. That optic will only absorb so much light though, and eventually all of its absorbing species in the glass will have absorbed a photon and exists in the excited state (just like the state of the lasing medium!!) This means it can no longer absorb light, and then suddenly the glass becomes transparent to the light from the ruby. Then any light that gets produced will bounce around in the cavity and get amplified, and all of that energy will get dumped all at once into a fast and powerful pulse.

So I guess the point of all of this is that the saturable absorber in this has been tuned to absorb 694nm light, and I wouldn't bet on it absorbing 1064nm light for Nd:YAG. Plus you can't toss in any passive Q-switch into your laser as one with to much doping will kill the output of your laser, and one with too little will saturate too early and may not give you good Q-switching. If you felt like experimenting you could build your own passive Q-switch with a dye that absorbs 1064nm, and then you could tune the dye concentration to optimize the output.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Thank you, nice explanation. Good thing I asked and you were willing to help.
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Very interesting styro +
 
Re: PERMANENT THREAD: Ebay& other internet FINDS of interest- read all the OP please

Alaskan said:
Can anyone tell me what this might have come out of, wedge shaped unit, a bar array?

Laser Optic Diode Array Q Switch with Laser Crystal | eBay
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Not out of a bar array seeing as it's a Q-switch and a Q-switch wouldn't be much use with one of those.

Could be from a Q-switched YAG or some other Q-switched laser. Hard to say.
 
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