Old 07-26-2014, 06:58 PM #1
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Default Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm

Lumenis Vasculight Laser Head Nd:YAG 1064nm

I bought a NOS 1064nm ND:YAG laser head without the power supply or control circuitry. Trying to find specs on the flash lamp and coolant flow required for this head as well as anything else that can be found about it. The manufacturer isn't helpful, tried already, they just want to sell me the newer version of this unit. The unit is capable of up to 50 joules of power, that's many thousands of watts of peak power.



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Old 07-26-2014, 07:01 PM #2
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

Two more photographs from the head:





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Old 07-26-2014, 08:22 PM #3
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

Are you sure that that is the complete laser?!! I think that's way too small for what you said no way getting a 50J pulse out of that!
Looks like a fibre coupled handheld
can you please post a pic of the cable connections
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Old 07-26-2014, 10:55 PM #4
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

It's a full head with rod and flash lamp as well as plumbing for coolant. The rod is 8mm X 110mm and the head is marked 2 to 16 ms at 50 J/cm2 max energy (someone else is stating the rod to be 6mm diameter, not sure). Of course, the repetition rate isn't very fast as you must wait a few seconds between pulses and maybe that's where you are questioning the rating, why so small, it's small for that amount of peak power because the average power is far far below that amount.

Here's a photo of what is inside the unit, from another sale on ebay, not the one I bought.



Here's the connector end of the head:



More photo's of what is inside of one of these heads here:



http://www.ebay.com/itm/High-Power-N...item3f1c2fb2e6

http://www.ebay.com/itm/Coherent-Lum...item4d14cfbd6d

Based on all of the above, the size of the crystal rod and the 7mm dia. x 14cm long flash tube etc., can someone please give me a reasonable guess on what voltage and current the flash tube needs? I have no experience with something like this (I state the obvious by now) and could use the help of someone who has, just a few pointers. What kind of liquid is used with these? Water or?

Edit: I found a good link for YAG experimentation here: http://192.197.62.35/staff/mcsele/lasers/LasersYag.htm
So, this will help me tremendously, but I wish I could find the actual specifications for this particular units flash tube, maybe I should keep trying with the manufacturer but I tried twice already and no info was given. Looking into this information further it appears the flash tube on this unit is rated at 50J but that probably doesn't mean I can get that much power out of the unit, I'm guessing there are large inefficiencies with these units.
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Old 07-27-2014, 06:01 AM #5
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

The voltage depends on the capacitor used and flashlamp length and bore diameter. Typically values between 400V and 800V are common. YAGs also require a pulse formation network (PFN), and whether or not that was contained in the head or the power supply is not immediately obvious. There's no pulse cap in the head, that's for sure, so you could theoretically match a power supply to a pulse cap you find, as long as the (electrical) pulse energy is within the flashlamp's rated range. Likewise, flashlamps require a trigger voltage, usually in the tens of kilovolts, to initiate the discharge. There are two methods; external (parallel) and internal (series) triggering. A simple piezoelectric butane ignitor unit can suffice. Finally, you need to know if it is passively or active Q switched. If it is passive then that is the easiest to get going. Active q switching requires precision high speed electronics design.
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Old 07-27-2014, 06:12 AM #6
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

Thank you, I'm starting to think the pulse width information on the side of the unit isn't what I thought it meant, looking into ND: YAG's it appears the pulse widths are much shorter than 2-16ms. I've built my own 3800 VDC 2 amp CCS (4 amp ICAS) high voltage power supply in the past, so I'm not afraid to tackle a project like this but I can now see it would be better to find a suitable power supply for the unit than have to build from scratch but I will see what I can do after I learn more about this YAG.
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Old 07-27-2014, 06:58 AM #7
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

I invite you to initiate a conversation with Hemlock_Mike. He has done wonders getting old Nd:YAG units to run beautifully off of nothing more than disposable camera flash circuits. Make sure to let him know about your experience with high energy and high voltage electronics as well as your understanding of laser safety, else he may not divulge much info (as I wouldn't either!).
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Old 07-27-2014, 07:20 AM #8
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

OK, thanks much. The HV power supply I built about 10 years ago was to drive two 8877 triode tubes in parallel for EME into a 16 X 32 element array at 144 MHz, made some great echo's off the moon
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Old 09-14-2014, 01:37 AM #9
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

I've sent Sam Goldwasser at the Laser FAQ a spreadsheet for calculating lamps.
I'd start with having him help you reverse engineer the xenon flashlamp parameters.
I'm up to my ears with projects right now, but Sam is retired.

For good Yag operation, one likes a higher voltage and smaller capacitor on a flashlamp pumped system like that. I used to service a similar product line used in labs, not for medical.

You need a cap charger, a cap, a series inductor of between 20-40 uH etc. You'll need a series injection trigger transformer, the whole lamp current flows through the trigger transformer. Due to the wet cavity, an external spark will not do.

If you can find a big Russian diode, you can also simmer and injection trigger the lamp. Coherent will have probably simmered the lamp, which is running a 30-60 mA current at DC through the lamp and dumping the cap into the lamp via a high DI/DT SCR or IGBT and a blocking diode..

However the classical external trigger will not work.

The good news is you can wind the inductor easily enough out of #10.

Coherent's Medical Partnership (Aka Lumenis) (and nearly every one else) flows partially deionized, filtered water through the cavity. Just a few litres per minute, at low rep rates like that. You need water at about 8 Megohms, not fully De-Ionized water. Fully deionized 18 Meg water will corrode the cavity. This is achieved by connecting a very small deionizer cartridge across the tubes to the laser head with tiny *********; sized tubing. The DI cart thus never sees enough flow to fully de-ionize the water. Without water, you run a strong chance of imploding the lamp.

The goal for running the small YAG laser is a critically damped flashlamp circuit. Otherwise you get horribly short lamp life. Running a mix of low voltage caps will not be such a good idea. The critically damped circuit gives you a higher peak power in the rod, which is desirable.

That has enough connectors on it that I believe it will have a Electro-Optic Q Switch on it.

SAM's page in the FAQ on the SSY-1 will give you a good start.

EG&G / Perkin Elmer have flashlamp guidebooks that are on the net at multiple locations.

You'll need to open the cavity up and see if there is a Q-switch crystal in there. May be, May not. Your pulse length spec is too vague for me to decide.

Pulse times in Nanoseconds indicate a Q-switched Laser. Pulse times in 100s of nanoseconds or a few microseconds indicate a free running laser.

YAG Pulse times in milliseconds mean the laser is probably Quasi-CW. Quasi CW means the lamp is simmered and a long DC pulse is dumped into the lamp for a few tens/hundreds of milliseconds using a switching power supply. (very rare)

50J/CM^2 at what spot size? That is not a 50 Joule head, by any means. (50 Joule per pulse Yags are massively huge)

READ: http://www.google.com/url?sa=t&rct=j...75097201,d.aWw


I've emailed my medical YAG friend, I'll see if he knows about that one.... It looks like a small IR "Versapulse" cavity.

Oh, and did I mention you need laser safety glasses of at least Optical Density 6 or OD7....

Lumenis reuses model names like crazy, you'll have a hard time finding data.


Steve

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Old 01-22-2017, 02:34 PM #10
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

What developments for this, I also want to know about the voltage and current.
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Old 01-22-2017, 03:04 PM #11
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

Steve, somehow missed your reply until now! Thank you, I have copied your response for the project, still haven't started yet, but I did find a second unit cheap, so I now have two of them.

Chris
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Old 01-23-2017, 12:51 AM #12
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

Chris --
I have an SSY-1 plus a couple little brothers made in Israel, both
using low duty cycles for range finding. Mine have Q switch cells
which self trigger and give a shorter pulse.
As stated above, I started with good sized camera strobe power
supplies but you need to find out the wiring for triggering as noted
above. Mine are not water cooled because they are low duty cycle
and no flash tube simmer current.

It appears that there are others here familiar with your device. I
hope they can help on this specific device. USE GOGGLES....

HM
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Old 01-23-2017, 06:15 AM #13
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

Mike and Steve, from further google searches I found the unit is long pulse; 1 to 200 milliseconds but generally was used between 2-16 ms for medical treatments at 70-150 J/cm2 energy density producing a 6 mm spot size. Even though the specification says "energy density at cm2" this appears to be far too much, considering how inefficient a YAG rod is. Also, I am not sure how to calculate the peak power with this unit when it can run such a long pulse range, what to use, 1 ms at 70 J for the short end? I doubt it, I need to find the power output graph vs pulse width. Without a Q switch, I imagine the pulse width is varied by how long the lamp flashes, anyone?

Rod length - 10.5cm. Rod diameter - 6mm. Arc lamp length - 15cm. Lamp diameter - 6mm~

I have a couple of SSY-1 YAG's now too, plus a couple of these Coherent 7960 (?) 3mm X 52.3mm YAG's that use passive Q switches out of a Lumenis Selecta II eye laser:


Selecta II | Lumenis

That's a lot of peak power:


http://www.ophiropt.com/laser-measur...wer-calculator

I should change my member name back to Laser Project, that is mostly all I have, parts for projects. I have acquired a pair of the original HV flash power supplies for the above unit, so good to go with that now. I will hold on to the Lumenis Vasculight units I have, but not sure I will end up using them after finding these smaller units which do not use liquid coolant. Perhaps I will use them if I can simply fill with liquid and only use them at a very slow pulse rate so they don't overheat.

I like to collect these little guys with the thought of using them someday, if in the future if anyone has any of these small air cooled units and wants to put them up on ebay I will bid on them, or consider a buy it now, perhaps a direct purchase through PayPal.
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Last edited by Alaskan; 01-23-2017 at 12:31 PM. Reason: added more
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Old 01-23-2017, 04:24 PM #14
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Default Re: Please help with Lumenis Vasculight Laser Head Nd:YAG 1064nm Crystal

what you've made a firing at the laser head in the first post image.
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