Heat-Affected Zone, or the area where laser beam and metal (or other) surface are in contact.
A substance or device used to dissipate or absorb unwanted heat, as from a manufacturing process (or, with lasers, from reflected rays).
Abbreviated HeNe. Laser in which the active medium is a mixture of helium and neon, which is in the visible range. Used widely in industry for alignment, recording, printing, and measuring, it is also valuable as a pointer or aligner of invisible CO2 laser light.