The Big Green Thread (I'm gonna regret posting this in the morning)

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Originally Posted by mixedgas

My way converts green to yellow without a dye.
Steve

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"Your way" as in proprietary? Your invention? You'll be a billionaire soon :D

naw.... So one else invented it, I just rediscovered it in a carefully optimized search.



Steve

Oh Boy. As you can tell from the post time, this has been consuming. Just finished the SHG alignment and although the power is a little low (for now) 750mW @ 25% pump power, the beam is other worldly. 2.5 mm @ aperture and 2.5 mm at 11M. The divergence/ beam waist are under my measurement precision! Thermal CONTROL of the KTP is critical and needs to be much less than 1 degree otherwise there is significant power loss.

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Woah, .. Orange and yellow. Awesome! Steve, you think that you could design something like this for less than 17 thousand euros?

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I am pretty sure we could do it. A modified version of the laser I built ( I now eat, sleep and s**t DPSS) could do this. But sitting here right now I think $50,000 would be fair.

Well congrats to Steve on the new job - you've got a place to stay in Nebraska if you're ever on the way through.

Planters - Congrats on the progress you've seen! That must be satisfying to have such a stunningly bright product of your labor! Is this project considered "open source" to where the design and parts resources are released for amateur construction and community involvement?

1. Planters when I get back I will improve your measurement capabilities. Its not difficult, and is something I've wanted to disclose on PL for years.
2. Congrats on First Light!
3. I bought some optics for 1121 nM a year ago, they are a set for a Q-Switched laser. Qswitched does not mean bad things at 20 Khz.
4. I have another way that starts with Green and converts to red, yellow, and orange, or all three at once.
Its not inexpensive, either. It may need licensed, which is always a thorn in the side.

Steve

I remember I saw somewhere some simple organic polymer disks with embedded standard dyes and an AR coating for generating orange-reds from green... isn't there some room in this direction?

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Originally Posted by shrad

I remember I saw somewhere some simple organic polymer disks with embedded standard dyes and an AR coating for generating orange-reds from green... isn't there some room in this direction?

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For Qswitched pumps, yes, that works. Lifetime and power is limited. The disk has to be spun.
Steve

Steve,
On one, that will be useful. Nevertheless, the divergence/diameter product is unquestionably in the "lab" class and not typical CN "projector" class.

Lets talk about #3.

I know about #4, but licensed? We need to talk about this too. The modifications that I believe should be made to the current design will involve some ABCD calculations and I know you can do this. But, this may be a little premature as strict thermal control of the KTP is the next priority for increasing output power.

when will your next excellent video on the project be out?

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Originally Posted by planters

Oh Boy. As you can tell from the post time, this has been consuming. Just finished the SHG alignment and although the power is a little low (for now) 750mW @ 25% pump power, the beam is other worldly. 2.5 mm @ aperture and 2.5 mm at 11M. The divergence/ beam waist are under my measurement precision! Thermal CONTROL of the KTP is critical and needs to be much less than 1 degree otherwise there is significant power loss.




I am pretty sure we could do it. A modified version of the laser I built ( I now eat, sleep and s**t DPSS) could do this. But sitting here right now I think $50,000 would be fair.

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Originally Posted by planters

thermal control of the KTP is the next priority for increasing output power.

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How are you controlling the TEC right now? Did you try that digital controller that I linked you to yet?

Adam