I'm doing a very short presentation on a laser. I want to discuss the most important concepts of a laser (in less than ten minutes). What should I include? I was thinking about stimulated emission and amplification. (But I'm not sure I really grasp these concepts) For instance, does stimulated emission occur only in a laser? Is it a rare thing? Is stimulated emission the reason why the photons experience amplification? Also, what role do the mirrors play? Are the mirrors the reason the beam is collimated? Or do the mirrors act to induce the semi-isolated system of the laser that allows for stimulated emission? Any helpful information would be great!!!