My new homemade CO2 laser

Here is another CO2 laser I made. With the exception of the neon sign transformer, the glass tubing, and the resonator optics; most of the parts can be obtained from a hardware store. It is smaller than my first homebuilt CO2 laser. A section of PVC pipe is used for the cooling jacket. The PVC pipe is 28, 1, 2 long. PVC compression fittings have been placed over the ends of the PVC pipe. A pair of PVC caps have been placed on the ends of the fittings (opposite the pipe), and holes have been drilled through t br, br,