1 September 1991 10.6-um TEM00 beam transmission characteristics of a hollow circular cross-section multimode waveguide
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Abstract
The first direct measurements of a periodic variation in the axially dependent transmission characteristic of a hollow circular cross-section waveguide are described. The experimental results are explained in terms of the excitation and propagation of the two lowest order EH1n modes. As these modes propagate along the waveguide, they run in and out of phase with one another, causing a periodic refocusing of the input beam. Midway between the refocusing points, intensity profiles of a 'doughnut' form are produced. It is proposed that these dramatic field variations produce an axially dependent variation in the waveguide attenuation coefficient, thus explaining the experimental results.
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Richard Michael Jenkins, Richard Michael Jenkins, R. W. J. Devereux, R. W. J. Devereux, } "10.6-um TEM00 beam transmission characteristics of a hollow circular cross-section multimode waveguide", Proc. SPIE 1512, Infrared and Optoelectronic Materials and Devices, (1 September 1991); doi: 10.1117/12.47175; https://doi.org/10.1117/12.47175
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