10.6-um TEM00 beam transmission characteristics of a hollow circular cross-section multimode waveguide

Richard Michael Jenkins; R. W. J. Devereux

doi:10.1117/12.47175

1 September 1991 10.6-um TEM00 beam transmission characteristics of a hollow circular cross-section multimode waveguide

Richard Michael Jenkins, R. W. J. Devereux

Proceedings Volume 1512, Infrared and Optoelectronic Materials and Devices; (1991) https://doi.org/10.1117/12.47175
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

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 and 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); https://doi.org/10.1117/12.47175

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KEYWORDS

Waveguides

Wave propagation

Signal attenuation

Beam propagation method

Resonators

Silica

Waveguide modes

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