charles green wrote: >> 50%? I think that is physically impossible, due to the nature of a >> population inversion. >> > > http://www.rp-photonics.com/diode_bars.html has a paragraph on power > efficiency. the practical limit of efficiency has more to do with > interaction cross sections of excitation source with gain medium (in the case > of diodes is very high), and gain medium with oscillating modes (also high > with diodes). the ultimate conversion limit is the quantum efficiency of the > specific set of electronic transitions in question; in semiconductors, these > can be tailored in construction of the diode emitting area. > Yes, apparently I am out of date again! Not the first time.
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