I have a question on the way he is cooling it, wont the water also absorb some of the light needed by the ruby? I think this is where a YAG rod would do a bit better as i undertsand it is a ruby rod is not totally bathed in the pumping light then the darker spots will absorb the laser light, cause uneven heating and even damage the rod, where YAG will transmit the laser light though areas that may not be at the same light energy.
His cap set up is interesting and must have taken a lot of time to make all the little bars to connect it up, he is still at about 6 times the energy level i can do though DIY is fun as hell. My luck with his type of set up would have one cap some place in the middle go bad, lol
Remember Remember The 8th of November, When No One Stood, but Kneel, In Surrender
In a popular government when the laws have ceased to be executed, as this can come only from the corruption of the republic, the state is already lost. Montesquieu