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Proceedings Paper

Distributed Feedback Phenomena At 10.6µm
Author(s): P. J. Gorton; R. M. Jenkins
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Paper Abstract

A distributed feedback approach to CO2 waveguide laser resonator design based on the use of wall gratings has a number of potential advantages. In particular a move away from the need for bulky, accurately aligned, multidielectric coated mirror resonators, could have a significant impact on both manufacturing time and overall size leading to a new generation of compact low cost 10μm waveguide lasers. Distributed feedback (DFB) from wall gratings in hollow dielectric waveguides has been treated theoretically, initially by Marcuse 1, and further extended by Miles and Grow 2. The critical result of the latter analysis being that in order to attain sufficient feedback from a wall grating the waveguide wall separation should be of the order of 100Pms. Unfortunately waveguide attenuation is proportional to the inverse cube of the waveguide wall separation, with the result that commonly used waveguide materials such as Alumina, whilst having low enough attenuation for the fabrication of 1.5-2.0 mm bore lasers 5, have prohibitively high losses at 100um bore sizes. In this paper, following a brief review of hollow waveguide distributed feedback phenomena, the parameters affecting both waveguiding losses and feedback coefficients will be considered in the context of achieving highly transmitting small cross-section waveguides which will provide an effective basis for experimental studies of DFB phenomena. The results of theoretical predictions of potentially attractive waveguide materials and configurations will be presented and discussed. Finally the details of an experimental study of attenuation and distributed feedback phenomena in very small cross-section hollow dielectric waveguides will be described, with preliminary measurements being compared with computed data and the potential for a DFB waveguide laser being reviewed in the light of the results.

Paper Details

Date Published: 24 August 1987
PDF: 4 pages
Proc. SPIE 0806, Active Infrared Systems and Technology, (24 August 1987); doi: 10.1117/12.941395
Show Author Affiliations
P. J. Gorton, Royal Signals and Radar Establishment (United Kingdom)
R. M. Jenkins, Royal Signals and Radar Establishment (United Kingdom)


Published in SPIE Proceedings Vol. 0806:
Active Infrared Systems and Technology
V. G. Roper, Editor(s)

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