A further discussion of stimulated emission of bremsstrahlung

In an earlier paper¹ we proved the existence of stimulated emission of bremsstrahlung for electrons moving in the vicinity of nuclei. However, no estimate of the available power was given at that time. This paper extends the theory to the fourth order of perturbation theory, which allows one to estimate the available power from this process. We find that the available power increases proportional to the fifth power of the frequency, and that one might obtain power in the order of one watt at a frequency of 1000 gigacycles. The oscillation condition at these high frequencies is met by the passage of many slow electrons through a dense assembly of ions or atoms. Although these conditions are uncommon, stimulated emission of bremsstrahlung may play a role at microwave frequencies in very high current semiconductor experiments.