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Cheap source for high mJ at super low times?

H2Oxide

H2Oxide

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Hello everyone, I have another (probably stupid) question for all of you. What is the cheapest way to get ~500 mJ at 532nm? There was a previous thread about ionizing air with this kind of thing, but that's not what I'm trying to do. There are skin care lasers that do ~400 mJ at 532 (supposedly), that power would be acceptable, but they do it in ~6-10ns. I'm trying to get that power in 1ns or less :eek:. So my question is, is there any affordable way of doing this? All rep. rates will work, I just need something that can spit out a ton of power in a super tiny period of time. Would it be possible* to build one?

*possible, not realistic.
 
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ChaosLord

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It's about power density. There's a few threads around about solid state range finder lasers (from M1 tanks i believe). SSY1 I think it's called, 1064nm output that can ionize with proper lens.
 
H2Oxide

H2Oxide

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H2Oxide said:
Hello everyone, I have another (probably stupid) question for all of you. What is the cheapest way to get ~500 mJ at 532nm? There was a previous thread about ionizing air with this kind of thing, but that's not what I'm trying to do. There are skin care lasers that do ~400 mJ at 532 (supposedly), that power would be acceptable, but they do it in ~6-10ns. I'm trying to get that power in 1ns or less :eek:. So my question is, is there any affordable way of doing this? All rep. rates will work, I just need something that can spit out a ton of power in a super tiny period of time. Would it be possible* to build one?

*possible, not realistic.
Click to expand...

Key word here: not :p.
Probably should have left that out to avoid confusion. Sorry :(.
 
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Alaskan

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I imagine using a SSY1 YAG (or other 1064nm YAG) coupled with a LBO crystal made for high pulse power would do that.
 
H2Oxide

H2Oxide

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Alaskan said:
I imagine using a SSY1 YAG (or other 1064nm YAG) coupled with a LBO crystal made for high pulse power would do that.
Click to expand...

Don't SSY1s have rather long pulses? (as in tens of microseconds?) The power that I need can actually be fairly varied, probably 200mJ and up, but it's the timing i'm having trouble with. Anywhere from 500 picoseconds to 1 nanosecond would work. I'm starting to wonder if q-switching is even the road to go down. Maybe mode-locking?
 
diachi

diachi

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H2Oxide said:
Don't SSY1s have rather long pulses? (as in tens of microseconds?) The power that I need can actually be fairly varied, probably 200mJ and up, but it's the timing i'm having trouble with. Anywhere from 500 picoseconds to 1 nanosecond would work. I'm starting to wonder if q-switching is even the road to go down. Maybe mode-locking?
Click to expand...


You'll have a hard time getting those pulse widths (reliably at least) with Q-switching. Looking at >10ns for Q-switching. Mode-locking would probably be the best way to go for those pulse widths.

Now you said you need it to be affordable, what do you consider affordable? A project like this would be very complex and expensive. Maybe you could luck out and find a working unit capable of what you want on eBay or somewhere like that, but even then I'd expect it to run you a good few thousand dollars.

Edit: What is it that you are trying to do that requires 500ps pulse durations?
 
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H2Oxide

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I'd say affordable is anywhere from $1000 - $10000. Wouldn't really expect it to be any less, couldn't afford it for more. (can't really afford that as it is =/). As for what I'm doing, I'm trying to measure long distances super accurately, on surfaces that may or may not be reflective. Big project :undecided:
 
diachi

diachi

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H2Oxide said:
I'd say affordable is anywhere from $1000 - $10000. Wouldn't really expect it to be any less, couldn't afford it for more. (can't really afford that as it is =/). As for what I'm doing, I'm trying to measure long distances super accurately, on surfaces that may or may not be reflective. Big project :undecided:
Click to expand...

It might be something that can be done on that kind of budget with some lucky surplus finds. If you're confident about moving forward with this project then there are some who may be able to point you in the right direction. Steve (Mixedgas on PL) may be able to help you if you're serious. He works on these kinds of lasers for a living.

I should reiterate - this is not going to be a simple project, maybe start off by building a simple, linear, DPSS unit first? Then work your way up.
 
H2Oxide

H2Oxide

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diachi said:
I should reiterate - this is not going to be a simple project, maybe start off by building a simple, linear, DPSS unit first? Then work your way up.
Click to expand...

Of course. This is a loooong term project, I'm just gathering some information before I decide whether it's worth it or not :).
 
hakzaw1

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Steve comes here also on occasion- super helpful and tons of knowledge.
his username here is LSFAQ(iirc)--(Laser Safety) He took the LSO course at the same time i did. He would know what lasers are inside what .
hak
 
diachi

diachi

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H2Oxide said:
Of course. This is a loooong term project, I'm just gathering some information before I decide whether it's worth it or not :).
Click to expand...

I understand, I'm working on a project of similar complexity and I am currently at around the planning stage too. :)
 
H2Oxide

H2Oxide

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aelshafiey said:
Can you please give me the link of the post you mentioned (Cheap laser that ionize air)
Click to expand...
It was actually your thread. Sadly there doesn't really seem to be any surplus for these kind of things :(.

EDIT: btw, why do you want to ionize air?
 
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A

aelshafiey

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I have 2 electrodes, the cathode is connected to a Marx generator and the anode is connected to ground, when it reaches a certain range of voltage, self break down occurs. However I'm trying to trigger the spark gap so it arcs at the voltage I want every time (because the self break down occurs whenever it occurs)
 
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