2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/125855We study the far field characteristics of oval-resonator laser diodes made of an AlGaAs/GaAs quantum well. The resonator shapes are various oval geometries, thereby probing chaotic and mixed classical dynamics. The far field pattern shows a pronounced fine structure that strongly depends on the cavity shape. Comparing the experimental data with ray-model simulations for a Fresnel billiard yields convincing agreement for all geometries and reveals the importance of the underlying classical phase space for the lasing characteristics.4 pages, 5 figures (reduced quality), accepted for publication in Physical Review LettersOpticsMesoscale and Nanoscale PhysicsChaotic Dynamicstext