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Old 11-16-2011, 06:38 AM #1
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Default Q switch curiousity.

I am just curious. Have no genuine purpose other than I can't find my answer elsewhere. How many Watts do the average Q-switch medical laser's have? Ones mainly used for removing tattoo's is what I'm talking about.

Note* I have no intention in getting one of these. I was just wondering.


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Old 11-16-2011, 08:45 AM #2
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Default Re: Q switch curiousity.

No idea ! Any pics ?

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Old 11-16-2011, 08:55 AM #3
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Default Re: Q switch curiousity.

They range from 2 Watts all the way up to 1 Kilowatts. They vastly range in wavelengths such as 438, 440, 447, 473, 555, 561, 750-1000, 946, 1313, 1320, 1342nm

lol
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Old 11-16-2011, 09:12 AM #4
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Default Re: Q switch curiousity.

Pulsed lasers are not measured in watts. The watt really has no meaning in that context because it does not pulse over a full second. The Joule is the measure of energy used for pulsed lasers. Pulsed lasers are incredibly energetic. The q-switch allows the cavity energy to build to maximum and releases the full cavity energy in a pulse lasting anywhere from 10ns or so to 200ns depending on the design. Medical lasers generally range from mJ to J pulses depending on what they are to be used for. The last pulsed system I operated output 1.52mJ pulses at a wavelength of 532nm. This would punch holes in thin steel. I happen to love pulsed lasers. They are much more dangerous however due to the very high emission energies involved plus the electronics are often comprised of dangerous capacitor banks for driving arc or flash lamps (older systems).
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Old 11-16-2011, 10:14 AM #5
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Default Re: Q switch curiousity.

Okay smart one well he wanted his question answered so I answered it :P

Good looks though

Technically yes the lasers are not measured in watts
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Old 11-16-2011, 11:24 AM #6
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Default Re: Q switch curiousity.

Quote:
Originally Posted by FrothyChimp View Post
Pulsed lasers are not measured in watts. The watt really has no meaning in that context because it does not pulse over a full second. The Joule is the measure of energy used for pulsed lasers. Pulsed lasers are incredibly energetic. The q-switch allows the cavity energy to build to maximum and releases the full cavity energy in a pulse lasting anywhere from 10ns or so to 200ns depending on the design. Medical lasers generally range from mJ to J pulses depending on what they are to be used for. The last pulsed system I operated output 1.52mJ pulses at a wavelength of 532nm. This would punch holes in thin steel. I happen to love pulsed lasers. They are much more dangerous however due to the very high emission energies involved plus the electronics are often comprised of dangerous capacitor banks for driving arc or flash lamps (older systems).
Nice answer
You deserve it +1

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Old 11-18-2011, 06:18 AM #7
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Default Re: Q switch curiousity.

Quote:
Originally Posted by Jollyrajer73 View Post
Okay smart one well he wanted his question answered so I answered it :P

Good looks though

Technically yes the lasers are not measured in watts

Hey Jollyrajer73, while the frothy one may be correct in the strictest sense, you are not incorrect in practical terms. The manufacturer specs for pulsed lasers sometimes list figures for average output power, in which case, the unit is indeed the Watt.

And, speaking of "good looks", I hope for your sake that the sweet chiquita in your avatar is your gf. She's gorgeous. And by that, I mean take one look and fall outta your chair without noticing gorgeous. Relax, not lookin to steal her from ya, I'm on the East coast (but, man oh man if I wasn't.......).


Edit 2: HMMMMM, something just occurred to me: You might actually BE the sweet chiquita in that avatar (posing with a guy friend). If so, please excuse my assumption.

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Old 11-18-2011, 12:32 PM #8
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Default Re: Q switch curiousity.

1.52mJ can punch steel ? It's the same energy as 1.52mW over 1 second right ?
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Old 11-19-2011, 06:45 AM #9
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Default Re: Q switch curiousity.

This is why pulsed lasers are not measured in watts. What is the equivalent power if that energy is not over 1 second but over 80ns (pulse duration)? You will see why it will punch a hole in thin steel. Your solution should have a kW after it.
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Old 11-19-2011, 02:37 PM #10
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Default Re: Q switch curiousity.

1.52mJ/50ns = 30.4kW. Of course that's if it didn't "rest" between firing pulses at all.

Suppose there are 5000 pulses per second. 1.52mJ * 5000 / 1s = 7.6 watts.

The difference between this laser and a 7.6 watt Continuous Wave laser is that it puts out 30kW for a fraction of the time and recovers the rest of the time, averaging out to 7.6W overall. But you'll be slicing away a tiny chunk of steel each pulse, rather than barely heating it up at all.
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Old 11-19-2011, 04:02 PM #11
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Default Re: Q switch curiousity.

Oh if it does 5000 such pulses per second, then fine.
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Old 11-19-2011, 04:04 PM #12
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Default Re: Q switch curiousity.

Quote:
Originally Posted by DrSid View Post
Oh if it does 5000 such pulses per second, then fine.
Well I have no idea, I'm just illustrating the math. 50ns is 50 billionths of a second. There are 20,000,000 of those intervals in one second. I also picked 50ns out of thin air as well.

The reason it cuts steel is that for a 20-millionths (1/20 of a millionth) of a second the laser is a 30KW laser. Then it's off for a while. Then back on at 30KW.
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Last edited by arcaneinsomniac; 11-19-2011 at 04:06 PM.
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Old 11-19-2011, 04:23 PM #13
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Default Re: Q switch curiousity.

Yeah, but generally it's all about transfered energy. 1J pulse may by 100ns short, or 1s short .. and it should generally have same effects. With steel it won't be same, as steel conducts heat well, and short pulses will be much more effective .. but IMHO not 1000 times.
I doubt ONE 1.52mJ pulse can burn steel, or anything any well. I guess you have all seen SSY-1 videos .. those are single pulses about 0.1 J. And they are just on border of denting steel.
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Old 11-20-2011, 05:33 AM #14
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Default Re: Q switch curiousity.

Quote:
Originally Posted by FrothyChimp View Post
This is why pulsed lasers are not measured in watts. What is the equivalent power if that energy is not over 1 second but over 80ns (pulse duration)? You will see why it will punch a hole in thin steel. Your solution should have a kW after it.
I just happened to stumble on one of your video's on youtube. The 10W green dpss.
I must say sir that is most impressive.
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Old 11-20-2011, 09:00 AM #15
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Default Re: Q switch curiousity.

Quote:
Originally Posted by Ilotrophic View Post
I just happened to stumble on one of your video's on youtube. The 10W green dpss.
I must say sir that is most impressive.
Wow I just saw it too.

How much does a unit like that cost?
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When setting up LFI make sure you check the "Laser On" Option to turn on the signal!! This took me forever to figure out.
M-140 445nm@ 1800mA in L2X body (I have both a 2x18650 and 1x18650 L2X tubes that I drive with either 2x18650 or 2xIMR18350) with G2 LFL lens
Mitsubishi "500mW" 638nm @ 1400mA in Solarforce P1D Grey, beautiful custom Copper heatsink in a waterproof configuration and with a G2 lens You have outdone yourself Flaminpyro!
M-140 445nm @ 1800mA Lazeerer X-Drive 2x14430 host thanks Ehgemus
Crooked 500mW O-Like Crown 532nm thanks Susie (but damnit, it's mounted crooked)
Mitsubishi "300mW" 638nm @ 775mA in Solarforce L2T Waterproof
A-140 445nm @ 1500mA flexdrive, Aixiz 445 lens in Solarforce L2P Waterproof thanks Jayrob
BDR-S06J @475mA L2P thanks Flaminpyro
LPC-826 in Aurora SH-032 Stainless @417mA
PHR-803T @ 85mA
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Old 11-20-2011, 09:36 AM #16
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Ilotrophic Ilotrophic is offline
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Default Re: Q switch curiousity.

Quote:
Originally Posted by arcaneinsomniac View Post
Wow I just saw it too.

How much does a unit like that cost?
I don't know exacts. But more than my car.
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1000mW Spartan (445)
800~1000mW DIY (445) IN PROGRESS
5mW Ebay (532)
30~45mW DIY (532)
250~300mW RayFoss Labby (650)
2000mW DIY (808) IN PROGESS
____________________________________
Dragonlaser 405-540nm Eye protection
Eagle Pair 190-540nm Eye protection
Eagle pair 190-540nm & 800-2000nm Combo
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Rayfoss Tripod (actually works very well with the spartan)
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