Method to achieving high-power microwaves in air and argon

The paper summarizes the results of the microwave generation in atmospheric air and argon at high pressure. The method how to proceed to achieving higher power level is presented. Two experimental setups were considered. Attention is paid to the interactions between the frequencies in the resonant cavity i.e., the coherence effect. The objective is to get reproducible data and the generation of the microwave emission at the single frequency to avoid the coherence effect. The electrons in the cavity are created by the electric field and by the photoionization, enabling the population inversion to be obtained. Because of the electron impact with N
₂
in air, molecules cannot lose this energy by photon emission, their excited vibrational levels are metastable and live for a long time. The microwave pulse of long duration can be generated. The various radiation lines created in the resonant cavity are noted. To achieve high-power microwave emission, the resonant cavity has to be tuned to the more powerful line of the rotational and/or vibrational transition of molecules in air occurring at high frequency and not at 1-GHz frequency used in this study. A compact system could be achieved by using the high-frequency line. The study points out that the microwaves are produced through the amplification by stimulated emissions of electromagnetic radiation (maser action) in air and argon.