A number of lasers available in the demo room. This is not all of the lasers available for use. Far from it, actually. This just happens to be the few that were within arm's reach when I was documenting them.
Fun fact: LASER stands for Light Amplification by Stimulated Emission of Radiation, so something like PLDS (Pulsed Laser Diode Spectroscopy) is like a recursive acronym or something.