Self-Consistent Solution of the Diffusion and Current Spreading Problems in Oxide Stripe Lasers Using Integral Equations: An Application to Triple Stripe Lasers

The problem of current spreading and diffusion in oxide Stripe lasers leads to two coupled boundary value problems. This paper presents an efficient method for the simultaneous solution of these two problems based on the conversion of the two-dimensional Laplace equation representing the current spreading into integral equations by means of a contour integral. The power of the method is illustrated by its application to a coupled triple-stripe laser. Highlights of the numerical method are discussed. © 1985 IEEE

A study of lateral modes in wide double-heterostructure GaAs-GaAlAs laser diodes

Higher-order lateral modes produced in wide GaAs-GaAlAs DH lasers were spectrally analyzed and photographed by the use of spatially resolved spectroscopy. These modes behave differently in mesa- and stripe-geometry lasers. They were studied in detail as a function of pumping current for the mesa structure. The spacing between lateral modes could be approximated by a simple model based on a sandwich-type symmetrical dielectric waveguide. Stripe-geometry lasers follow Hermitian-Gaussian mode patterns which are produced by parabolic refractive-index profiles. An anomalous development of mode intensities near threshold was observed in the mesa diode. Immediately above threshold, higher orders dominated the near-field patterns. Explanation for this could be found in the lateral optical gain profile produced by the interaction of the nonlinear characteristics of the p-n junction and the geometrical series spreading resistance of the substrate

Calculation of lateral current spreading and series resistance effects in oxide stripe geometry GaAs-GaAlAs DH lasers

An exact solution is presented to the problem of current spreading in the resistive layer of stripe geometry DH lasers. Computed examples demonstrate that the customary onedimensional treatment of the resistive layer or the assumption of constant current density distribution under the stripe contact are not always justified. © 1981, The Institution of Electrical Engineers. All rights reserved