I want to interject here. I just saw this thread and there are some statements that I want to correct. The laser system I presented in the video is not that expensive. More than $1,000 and much, much less than $10,000, It is not delicate at all and although some owners of these KTP lasers use them to pump dyes many use the 40 or so watts of green for high power aerial displays which involves trucking them to remote sites and running them in some weather.
Almost all dye lasers that use a system like mine operate with sulforhodamine to generate around 620nm. I modified the optics and the dye mixture to operate at 575nm because that remains a rare and otherwise nearly impossible color to generate.
To avoid optical damage many dye lasers will pump the dye as it free flows a short distance from a nozzle to a receptacle. These are notoriously messy. To date I have not had a single leak or stain (knock on wood) and there is no odor.
Now, for the bad news. These are VERY dangerous. I'm not talking about the risks that anyone here faces, who has worked with multi-watt diodes and occasionally seen a flash of reflected light. The average amount of pump light that is required to get a dye to lase is dependent on the instantaneous intensity. Only very high quality CW 532nm lasers can be focused tightly enough to provide enough gain in the dye for lasing. The beam out of this laser is not nearly good enough, so this laser is Q switched. By using a pulsed radio frequency (MHz) a small silica crystal is forced to change its refractive index slightly and deflect the fundamental (1064nm) beam just enough to prevent lasing operation. The YAG continues to receive arc lamp input and the energy is stored until the Qswitch reverts to a non-deflected state and then BOOM, a pulse with tens of kW of power fires into the dye and it lases. This happens at a rate of 10-20kHZ, so it looks continuous, but even turned down to a couple of watts (average) it can cut steel. No kidding, I've done it.
I am now working on a solid state Raman shifted vanadate laser based on my DPSS laser that is designed to produce watts of output at 588nm. So, we'll see if it's possible to get away from dye and pulsed lasers.
Now what's with the cough, cough? There is nothing wrong with participating on LPF or PL as I see it. What am I missing?
Incidentally, the other videos on the Tech Ingredients site might be interesting (I'm prejudiced) for those that haven't seen them.
https://www.youtube.com/user/TechIngredients
Hope this helps.