A Basic Study of Beam Stability in Optical Waveguides.
Final rept. 1 Jul 71-30 Jun 74,
RHODE ISLAND UNIV KINGSTON DEPT OF ELECTRICAL ENGINEERING
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The report describes the results of research on beam positional instabilities in optical beam waveguides. Theoretical and experimental work was undertaken in an effort to determine the effect of instabilities on transmission performance and to determine how to best stabilize the guide. Beam waveguides are an excellent transmission medium. Beam instability is caused by statistical variations in guide parameters. After propagating the beam 180 meters through 9 guidance elements, the author measured only very small variations in the beam position 2mm over 2 months. Instability can be controlled with beam position control systems. Bothersome system transients can be controlled by increasing damping. The interaction between controllers acting at different lenses can be eliminated by designing the controllers to respond to changes in the beam slope. This improves the transient response and results in the movement of only those lenses that are misaligned. Modified author abstract
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