Abstract
Earlier we presented papers concerning the development of planar hollow metallic waveguides (HMW) designed for transformation of middle IR-range laser emission. In these papers we analyzed the waveguides multimode operation characteristics. However, a single-mode operation is more desirable, since in this case the total emission intensity is transferred in the waveguide by weakly attenuated TE1 mode. In order to realize a single-mode transmission in a multimode waveguide, one has to excite a TE1 mode at the HMW input with efficiency higher than 96%. To achieve this, a precision alignment is necessary, since even a small shift results in excitation of higher TE2 and TE3 modes. The existence of the latter, along with a TE1 mode, gives use to the intermode interference which strongly effects the output intensity distribution and may result in misinterpretation of output mode content. (Thus, for example, the side maxima originating in TE1 and TE3 modes interference are often mistaken for diffractional maxima in a single mode operation.) In this paper we analyze the output intensity distribution and characteristics changes in intensity profile of interfering modes. We obtain, both numerically and experimentally, the relation between the intensity distributions in the near and far zones, which makes it possible to correct identification of a mode structure propagating in the HMW.
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