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Old 09-09-2016, 12:04 PM #1
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Default SSY1 ND YAG Divergence Question

OK, I've spent an hour searching the web today trying to find the approximate divergence of small ND YAG lasers such as the SSY1 which use close to a 3.5mm X 60mm rod, so far I'm not satisfied with what I'm finding. Does anyone know the approximate divergence of those small laser range finding YAG's?


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Old 09-09-2016, 02:32 PM #2
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Default Re: SSY1 ND YAG Divergence Question

I have just spent a bit finding out for you. Unfortunately I have had no luck either.
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Old 09-09-2016, 02:45 PM #3
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Default Re: SSY1 ND YAG Divergence Question

Depends on what cavity optics are on there - the ones on yours may be different from the SSY1. Measuring the beam directly may prove to be a bit of a pain due to the short pulse length and single shot nature of those heads.
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Old 09-09-2016, 02:46 PM #4
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Default Re: SSY1 ND YAG Divergence Question

Thanks, I did find mention that when the SSY1 is passively Q-switched the divergence is greater, but I am guessing having the Q switch shortens the pulse while at the same time increasing the power so much it more than makes up for it.
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Old 09-09-2016, 03:28 PM #5
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Default Re: SSY1 ND YAG Divergence Question

Quote:
Originally Posted by Alaskan View Post
Thanks, I did find mention that when the SSY1 is passively Q-switched the divergence is greater, but I am guessing having the Q switch shortens the pulse while at the same time increasing the power so much it more than makes up for it.

Why did I think the SSY1 had an active rotating prism type Q-switch? Must be thinking of some other small YAG...

Edit: Sam's FAQ says "a few mRad" divergence - not yet measured. Not terrible ... stick one of your big expanders on there

But yes, the Q-switch will make a big difference.

With Q-switch (Yellow, lamp current. Blue, lamp light. Pink, laser light):


Without Q-switch:


From this page: http://c4r0.elektroda.eu/_hv/index.php?page=lasers/ssy1

Isn't c4r0 a member here...?
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Old 09-09-2016, 03:49 PM #6
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Default Re: SSY1 ND YAG Divergence Question

Thank you so much, great. I'm a bit confused though, with the Q switch the graph shows a nice short duration spike, but I don't see that it is (edit: all that much) higher to indicate more peak power, I thought I'd see a big difference, is that a log scale?
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Old 09-09-2016, 04:03 PM #7
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Default Re: SSY1 ND YAG Divergence Question

Quote:
Originally Posted by Alaskan View Post
Thank you so much, great. I'm a bit confused though, with the Q switch the graph shows a nice short duration spike, but I don't see that it is (edit: all that much) higher to indicate more peak power, I thought I'd see a big difference, is that a log scale?
He's using double the pump energy with the Q-switch removed. 32J instead of 16J - that may explain it.

Plus this setup here isn't exactly the best way to accurately measure pulse energy:

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Old 09-09-2016, 05:27 PM #8
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Default Re: SSY1 ND YAG Divergence Question

oh, i am using my cell phone, loading that link is slow. flying to another base tonight.
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Old 09-19-2016, 12:11 PM #9
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Default Re: SSY1 ND YAG Divergence Question

Interesting web page on the SSY1

Laser YAG déclenché pompé par flash

Edit: Look at all the cool pages he has here: http://www.swissrocketman.fr/lasers-...es,fr,2,51.cfm
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Old 09-19-2016, 03:01 PM #10
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Default Re: SSY1 ND YAG Divergence Question

Quote:
Originally Posted by Alaskan View Post

Yep, discovered his page ages ago, I'm sure I posted it somewhere. Lots of cool stuff!

FYI, he also has a YouTube channel
https://www.youtube.com/user/rocketman340

He's the guy I mentioned in another thread that's been working on the TEA CO2 pumped dye laser, using the light from air breakdown caused by the CO2 laser to pump the dye.
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Old 09-19-2016, 03:09 PM #11
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Default Re: SSY1 ND YAG Divergence Question

Oh, I have watched his videos many times before. I didn't notice the URL.
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Old 09-19-2016, 03:41 PM #12
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Default Re: SSY1 ND YAG Divergence Question

I've had the luxury of being able to search the net all day long for several days while waiting for the next flight out of this base, a whole week between flights to where I need to go, so googling information, when I can... the internet is up and down here terribly, but sometimes up for hours, yay! So, I found his web page when YouTubing YAG's. My next question to find the answer to is to understand how the power output and pulse width of a SSY1 YAG is changed when removing the passive Q-switches. I think I saw where the thing puts out ten times more power due to the power being concentrated in such a short pulse when using a Q switch, trying to confirm. If anyone knows, please jump in.

Yep, more info just found:

I no sooner post this and I find that without the Q-Switch the rod just lases and outputs power as long as the pulsed light from the flash tube is active, so the pulse width then depends upon how long the flash is present, another subject to chase down now to know what determines how long a flash is but I suspect that is determined by the particular flash tube, the amount of capacitance and the choice of inductor used for the flash circuit, unless you have some fancy circuit board which can control the pulse width to the flash tube.

So, I'm digging for info on the above, and I need to find how many mJ of 1064nm one of these YAG rods can produce without a Q-Switch. Also, I need to know how the output might be polarized, or not.... seeking that info, so I re-welcome anyone who can answer those questions to jump right in, if you feel inclined, could save me some time searching, but I will keep looking in the mean time, will post if I find the info.
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Old 09-19-2016, 03:45 PM #13
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Default Re: SSY1 ND YAG Divergence Question

I know with those 532nm laserscopes, the Q-switch helped tremendously with the power output compared to without. I'm guessing it would be same with the YAG rod.
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If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
Bang Good Home

For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

For more sites and information please check out this thread.
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Old 10-04-2016, 11:09 AM #14
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Default Re: SSY1 ND YAG Divergence Question

I'm investigating optic choppers to Q switch that way, but getting conflicting info regarding whether that method is a good way to go or not.
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Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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