In Pokemon League Cynthia sell laser eyeballs for eyes and butts.

No; only some types of crystals, gases, etc. can be used in lasers.

A LASER is the results of a population inversion in the substance being stimulated. A solid state crystal LASER has a lamp that excites the crystals valence electrons into higher orbits. When they fall back they give off photons. They are confined to bouncing back and forth between two mirrored surfaces. One has a hole in it and the LASER beam comes out there.

It exists. It has mass. It is used in optics to make laser crystals and switches for pulsed lasers. Niobium is an useful element.

One can purchase a laser etched crystal at your local mall. All you need to do is bring in a picture or they can help you take a picture on the spot. The processing of the crystal will take a couple of days.