Modifying Q-switch driver for external modulation

[mixedgas]

To be fair, one you understand how an AO Q switch works, and where the giant pulse(s) originate, it is obvious what must be done to suppress them.

Nothing in that PDF says anything that someone who knows enough to use the knowledge cannot trivially work out for themselves.

Regards, Dan.

I'll scan in the neos schematic when I am renting a huge scanner tommarow. It will be on the FTP password locked.

Steve

[Laserman532]

To be fair, one you understand how an AO Q switch works, and where the giant pulse(s) originate, it is obvious what must be done to suppress them.

Nothing in that PDF says anything that someone who knows enough to use the knowledge cannot trivially work out for themselves.

Regards, Dan.

WADR I have known possibly dozens of very smart people who have no concept of FPS or even the existence of it. It is not obovious to anyone until the problem of it, or its lack of it, surfaces. If it were common this thread would not exist. That PDF explains its exhistance and the theory on how one could eliminate it if one so desired, and even my uneducated acknowledgment of the document perpetuates the informations validity.

With the proliferation of dangerous equipment, in the hands of incompetant individuals, in the interest of public safety some information should be restricted.

MY theory... Those who should figure it out, will...those who shouldn't figure it out, can't...unless taught.

[DMills]

You don't see me posting schematics for modifying KTPs do you?

IIRC I found out about giant pulse from my copy of SSLE, so all this stuff is in the standard literature.

The scientific journals faced with essentially the same problem, post the theory and the results, not the implementation of the experimental apparatus, this is done for a reason (If you are smart enough to reproduce the experiment meaningfully you are smart enough to design your own hardware).

It is one thing to understand the theory, quite another to be able to design and build the hardware (Especially because RF is a bit subtle in places).

Granted the availability of off the shelf packaged electronics modules throws a spanner into this, but I suspect that there are more of those CT drivers around then the NEOS and relative availability has a part to play in this as well.

Regards, Dan.

[uk-laser]

I am thinking linear amplifier with a DBM on the input (SBL1?) or pin diode, but brewing up a new design is probably easier then modifying an existing one (The bulk power setting could be done by modulating the supply rail which leaves the RF stage in class C so little heat production).
27Mhz is a nice frequency (lots of CB radio transistors!).

Regards, Dan.

Hi Dan,

I have looked at something similar myself and have found a particularly tasty VCA with sufficient o/p current to drive a PA directly (unique device - p/no. withheld) This could do FPS and with subtle modification could allow for analogue modulation as well. I have even bought the ferrites for the o/p impedance matching for a pair of IRF510s ..... one of those projects on the back-burner until I get some time.....


Pat,

Apologies if you thought I went too far in posting the link to the AOM application note.
I appreciate how instructions on how to hack the safety interlocks on your brand x medical laser would be controversial but info on FPS for machining lasers is commonplace and to me it does appear fairly obvious.
If you think it necessary I'll happily remove the link and reference but I still think you need a reasonable amount of background in the field of RF and electronics to do anything useful with the information.

Rgds,
Robin

[Laserman532]

once you have FPS under control you have modulation.

Do not remove post on my behalf- im sure the information has been pilfered, and is being digested.

Our little problem over here has escalated to another level anyway, my hope was for equipment failure due to inadequate measures being taken for modulation.

no apologies necessary, you guys know the skinny, I just wish you would have talked amongst yourselves. I know it is a public forum, somethings are best left to experimentation.

my task / mission was dis info...FAIL

[Simon]

I find it really funny that people are not willing to share at least theories on solutions to problems or issues they have on technical problems or modifications.

I thought thats what public communities like this did !

I fully understand that final solutions take time and effort and I personally would not expect just to copy someone elses work without their permission or rewarding them.

As for Pat, deliberately trying to make sure someones laser is destroyed, that is just wrong.

Oh and yes, I do understand FPS

[Laserman532]

"As for Pat, deliberately trying to make sure someones laser is destroyed, that is just wrong. "

its the lesser of two evils...diabolical...brilliant muuhaaaaaaaaaa

[logsquared]

Laserman532,

If you are so concerned about people owning or using laserscope KTPs why do you sell parts on ebay? Can't these parts be used to kill or blind someone when installed? Or, are the parts you sell sabotaged?

Also, pictures you have posted here on this board show no regard for laser safety. Couldn't this be considered dangerous information?

I guess i missed a joke or something somewhere along the line.

[Laserman532]

Laserman532,

If you are so concerned about people owning or using laserscope KTPs why do you sell parts on ebay? Can't these parts be used to kill or blind someone when installed? Or, are the parts you sell sabotaged?

Also, pictures you have posted here on this board show no regard for laser safety. Couldn't this be considered dangerous information?

I guess i missed a joke or something somewhere along the line.

you missed the entire boat

the bullet analogy...bullets don't kill people, guns don't kill people, people kill people.

those are not my pictures...only evidence...

[heroic]

But if you sell someone a bullet and a gun, knowing they are going to use it to kill someone, you might get sued if you didn't do your due diligence.