Thesis

Transverse confinement in lasers

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Awarding institution
  • University of Strathclyde
Date of award
  • 1994
Thesis identifier
  • T8263
Qualification Level
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Department, School or Faculty
Abstract
  • We divide lasers into two classes, depending on their aspect ratio : defined to be the ratio of the width of the transverse beam to the characteristic scale of the pattern comprising it. We have studied, theoretically, the transition from large to small aspect ratio systems by considering the effects of transverse boundaries on the pattern forming behaviour of the laser equations. Specifically, we have considered the effects of transverse reflecting boundaries, gain guiding, and curved cavity mirrors on the travelling waves found in the infinitely extended system. We have shown that there is a transition between travelling wave behaviour and a boundary dominated rĂ©gime and have gone some way to characterising this transition by using the pump strength as a parameter. As a special case we have considered gain guiding in a solid state microchip laser and have shown that such a confinement mechanism provides a very effective suppression for higher order transverse modes.
Advisor / supervisor
  • Firth, William J.
Resource Type
DOI
EThOS ID
  • uk.bl.ethos.881475

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