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We study lasing emission from asymmetric resonant cavity (ARC) GaNmicro-lasers. By comparing far-field intensity patterns with images of themicro-laser we find that the lasing modes are concentrated on three-bounceunstable periodic ray orbits, i.e. the modes are scarred. The high-intensityemission directions of these scarred modes are completely different from thosepredicted by applying Snell's law to the ray orbit. This effect is due to theprocess of ``Fresnel filtering'' which occurs when a beam of finite angularspread is incident at the critical angle for total internal reflection.Comment: 4 pages, 3 figures (eps), RevTeX 3.1, submitted to Phys. Rev. Lett;  corrected a minor (transcription) erro

Fresnel Filtering in Lasing Emission from Scarred Modes of Wave-Chaotic Optical Resonators