My sister Monica and her husband Jim came to visit us a couple of weeks ago and we worked some more on my laminar jet project. We focused on two things, one was designing a mechanism to quickly stop and start the water flow, commonly called a cutter among the cognescenti. We also tried to improve the performance of the jets. I would like them to be able to shoot about six feet into the air and to carry about seven feet without delaminating. We were more successful on the first effort than on the second. Here is Monica working on one of the cutter designs we tried.
Ultimately we went with something a little different. There is a solenoid in the container with the green bottom/top and when electrified it pulls on the wire that moves the rectangular piece of plastic and covers the hole.
Here is a video of two jets with the cutters working.
In their final versions the cutters would channel the water away in a more graceful manner, but I'm guessing you get the concept. You can also see that the two jets are quite laminar. You can tell because they make very little noise when they hit the pool.
Owing to the generous sharing of information by many laminar jet builders on the web I have a few more ideas that I'll be trying soon.