Laser was originally an acronym, for "light amplification through stimulated emision of radiation".

R. J. De Young has written:

'Scaling blackbody laser to high powers' -- subject(s): Lasers, Blackbody radiation

'Lasant materials for blackbody pumped-lasers' -- subject(s): Solar-pumped lasers, Lasers in astronautics, Energy conversion, Laser pumping, Blackbody radiation, Laser cavities, Laser propulsion, Black body radiation

'A blackbody-pumped CO-N' -- subject(s): Lasers

Light Amplification by Stimulated Emission of Radiation = LASER

It is balanced by radiation pressure, and gas pressure.

All tunable LASERs are LASERS, however not all LASERS are tunable. In a tunable laser the lasing medium, which is typically a gas, dye or crystal, can be altered to produce slightly different frequencies, thus allowing the laser to be 'tuned' or frequency changed where most LASERS produce a very narrow band of radiation frequencies.