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

[steve-o]

My way converts green to yellow without a dye.
Steve

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

[mixedgas]

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



Steve

[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.

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

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.

[Meatball]

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?

[mixedgas]

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

[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?

[mixedgas]

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?

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

[planters]

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.

[swamidog]

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

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.

[buffo]

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

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

Adam