Abstract

Emission characteristics of an oval-shaped microcavity laser are studied. In experiments, modes localized on periodic orbits emit unidirectionally with a narrow in-plane divergence angle of about 12 deg. The origin of high directionality is elucidated by means of classical ray dynamics. Wave calculations show that the $Q$-factors of the resonances are higher than ${10}^8$. We explain this extraordinary high $Q$-factor in relation with a dynamical barrier region where Kolmogorov–Arnold–Moser curves significantly obstruct leakages of resonances.

© 2018 Optical Society of America

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