Date of Award

Winter 1994

Document Type

Thesis

Degree Name

Master of Science in Applied Physics - (M.S.)

Department

Physics

First Advisor

Ken K. Chin

Second Advisor

John Charles Hensel

Third Advisor

Yuan Yan

Abstract

A theoretical study of the semiconductor laser structures with lateral discontinuity in the optical resonant cavity is presented in this thesis. Specifically, the lateral discontinuity is referred to the lateral expansion structure newly invented for increasing the power output of semiconductor lasers while keeping single mode operation.

In the first part of the thesis (Chapter 2 and Chapter 3), an explicit expression for calculating the lateral discontinuity problems is formulated by the incorporation of mode-matching method. Our approach is based on the mode expansion theory developed for lossless micro-wave and optical fiber waveguides, but the effect of gain in active laser media is discussed. Direct numerical evaluation to various discontinuities problems in semiconductor laser stripes are feasible, as long as the discontinuity lies entirely in a surface perpendicular to the direction of propagation.

The second part of the thesis is devoted to applications of the theoretical approach. A computer program written in Fortran-5.0 is used to calculate the efficiency of lateral expansion laser structure. Graphs of the electric field patterns are produced by a program written in programming language C.

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