(under subclass 154) Subject matter wherein the atoms of a medium at the transmitter are caused to be raised from certain lower to certain higher energy levels to cause a population inversion between certain intermediate levels in order to ultimately produce photons when the energy level moves from higher to lower levels.
(1) Note. This is a form of optical amplification.
SEE OR SEARCH THIS CLASS, SUBCLASS:
134, for a pump in at least one of the plural sources to produce wavelength division or frequency division multiplex.
345, for a particular pumping type in an optical amplifier.
SEE OR SEARCH CLASS
372, Coherent Light Generators,
69+, for particular pumping type which is not used for amplification of a light beam input.
