Gaussian optics can be used to design a quasi-optical system converting the TE 06 mode output ( f =388 GHz) of a submillimeter wave gyrotron into a well-collimated, linearly-polarized free-space beam with a circular cross-section. A quasi-optical antenna produces a main beam with an elliptical cross-section, which is then converted by two mirrors into a well-collimated beam with a circular cross-section.
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Ogawa et al. (1999) studied this question.
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