Old 03-11-2015, 08:16 PM #1
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Default Cheap source for high mJ at super low times?

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 . 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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Old 03-12-2015, 03:01 AM #2
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Default Re: Cheap source for high mJ at super low times?

Don't you need UV laser pulses to really ionize air?
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Old 03-12-2015, 03:38 AM #3
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Default Re: Cheap source for high mJ at super low times?

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.
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Old 03-12-2015, 04:51 AM #4
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Default Re: Cheap source for high mJ at super low times?

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Originally Posted by H2Oxide View Post
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 . 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.
Key word here: not .
Probably should have left that out to avoid confusion. Sorry .
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Old 03-14-2015, 06:25 AM #5
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Default Re: Cheap source for high mJ at super low times?

I imagine using a SSY1 YAG (or other 1064nm YAG) coupled with a LBO crystal made for high pulse power would do that.
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Old 03-14-2015, 07:21 AM #6
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Default Re: Cheap source for high mJ at super low times?

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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.
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?
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Old 03-14-2015, 07:51 AM #7
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Default Re: Cheap source for high mJ at super low times?

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Originally Posted by H2Oxide View Post
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?

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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Old 03-14-2015, 09:42 AM #8
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Default Re: Cheap source for high mJ at super low times?

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
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Old 03-14-2015, 06:17 PM #9
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Default Re: Cheap source for high mJ at super low times?

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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
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.
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Old 03-14-2015, 06:22 PM #10
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Default Re: Cheap source for high mJ at super low times?

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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.
Of course. This is a loooong term project, I'm just gathering some information before I decide whether it's worth it or not .
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Old 03-20-2015, 07:39 PM #11
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Default Re: Cheap source for high mJ at super low times?

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 .
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Old 03-20-2015, 09:52 PM #12
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Default Re: Cheap source for high mJ at super low times?

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Of course. This is a loooong term project, I'm just gathering some information before I decide whether it's worth it or not .
I understand, I'm working on a project of similar complexity and I am currently at around the planning stage too.
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Old 03-31-2015, 02:39 AM #13
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Default Re: Cheap source for high mJ at super low times?

Can you please give me the link of the post you mentioned (Cheap laser that ionize air)
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Old 03-31-2015, 02:47 AM #14
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Default Re: Cheap source for high mJ at super low times?

I'm looking for a laser that can Ionize air (thats cheap as well)
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Old 03-31-2015, 05:00 AM #15
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Default Re: Cheap source for high mJ at super low times?

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Originally Posted by aelshafiey View Post
Can you please give me the link of the post you mentioned (Cheap laser that ionize air)
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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Last edited by H2Oxide; 03-31-2015 at 05:01 AM.
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Old 03-31-2015, 05:26 AM #16
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Default Re: Cheap source for high mJ at super low times?

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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