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561nm Yellow YAG (?) from Lumenis Varia Eye Laser

Alaskan

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High power DPSS sure beats the pants off of direct to wavelength diodes for beam divergence and quality.
 





ultimatekaiser

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Yeah itll go well above its ratings. :) its hard on the diodes though. They can each take probably 40 A if theyre the 40W version, but thatd generate crazy heat and may thermal shock the crystals.

I have a couple of these diode bars and it takes alot of effort to cool one properly.
 
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paul1598419

paul1598419

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I think you will be very happy once you can get into this and start trying to get all three to work. Even though you were mainly interested in the 561nm, 5 watts of 532nm is nothing to turn your nose up at either. It may be easier to get that one running first before you tackle the 561nm.
 
Laserbuilder

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Thank you for running this thread, I've read it with big interest. High power yellow lasers are really very rare, and I am looking forward to seeing how it will work when you make it running.

By the way, the laser lab of our Ophthalmic Research Institute has a 2.2W 578 nm Coherent DPSS laser, it is rumored that in the past there was a CVL machine instead, because the wavelength is identical to yellow CVL line. That is a huge contrast -- the device with the size of a big book does the same as the huge metal cabinet with 3 phase electrical supply, 25 kV inside and water cooling.
 
ultimatekaiser

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Yeah i know what you're talking about. Probably has an OPSL genesis taipan stuffed in it. Theyre used quite frequently in those machines now in place of CVLs, sometimes with other wavelengths.
 
Alaskan

Alaskan

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Laserbuilder, I would like to see that big machine, sounds wonderful, maybe big, but cool. Paul, 5 watts of 532nm is a lot, I don't know what the duty cycle would be at that output, I'd be very happy with half that amount out of this unit.

The 561 is what interests me the most. RHD's relative brightness calculator shows 561 nm as being about 90% as bright as 532, being it is closer to 555 nm which is supposed to be where our eyes are the most sensitive, I don't understand that number.

I am looking forward to working with this and seeing what it can do :) For now, all I can do is look and learn, produce better photo illustrations:

8%20Novus%20Varia%20Tri%20Color%20Laser%20Cavity%20WP.jpg


Old price list for parts:

DSCF4050_1.jpg
 
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L

lazeristasUVISIR

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How are those lasers cooled down?
Looks that every crystal and diode mount have own TECs. Where heat dissipates from them? Just a huge case with a fan or fans under?
Do you know the material of the housing?
 
Alaskan

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Each 808 nm laser diode and KTP crystal has its own TEC under them to regulate their temperatures, there are aluminum heat sinks below the platform but I haven't seen what is happening yet, I assumed each TEC has its own heat sink below the platform, but I don't really know. I purchased this and had it sent home to Alaska, my wife took the pictures. I haven't had a chance to see it except through photographs.
 
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diachi

diachi

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Alaskan said:
Yea, he accepted $650 USD for it. Damn it!
Click to expand...


Damn, you're going to have an absurd stack of parts waiting for you when you get back!

Here, throw this in too: Laser Export LCM-DTL-374QT LASER HEAD AND POWER SUPPLY | eBay

Q-switched 355nm laser, can be converted to 532/1064nm fairly easily as well as 355/532/1064 all at once. :D

Made the seller an offer and he countered with $600, too high for me just now though I'd love to get my hands on one of those.
 
Alaskan

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Don't tempt me, I've done enough damage already. However, isn't that kind of low power, even at 10 ns? What is inside those?
 
diachi

diachi

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Alaskan said:
Don't tempt me, I've done enough damage already. However, isn't that kind of low power, even at 10 ns? What is inside those?
Click to expand...


Krazer actually has one, and there's some information about them on the FAQ.

Link: LCM-DTL-347QT

Seems they'll do 100mW 355, 100mW 532nm, 100mW 1064nm all at once once you take out the separation prism on the output.

If you take out the 355nm stage the 532/1064 power goes up, and if you take out the 532 stage the 1064 power goes up even more, up to around 0.5W average. Not a ton of power, but seeing as it's Q-switched it'll allow for some uses that a CW laser of the same power wouldn't.

These were going really cheap a few years ago, annoyed that I missed out back then!
 
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Alaskan

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50 kilowatt peak pulsed 1064nm is cool, I guess it is a find after all. I want it, but no way, spent too much this month already, I should be ashamed of myself, came over to Iraq to make money for saving, not spending.
 
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