Chaotic microcavity laser with high quality factor and unidirectional output

Qinghai Song, Wei Fang, Boyang Liu, Seng Tiong Ho, Glenn S. Solomon, Hui Cao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

We demonstrate a chaotic microcavity laser whose quality is comparable to typical nonchaotic microcavity lasers, yet it has the unique characteristic of unidirectional output. The cavity shape is a disk with the boundary defined by a curve called limaçon of Pascal. For a lasing mode of volume less than 0.2 μ m3, the measured quality factor is 23000. The record-high quality and small modal volume result in extremely low-lasing threshold. The spontaneous emission coupling efficiency is approximately 6% and is the reported value for a chaotic microcavity laser. All the lasing modes have one output beam in the same direction with a divergence angle less than 40°. This universal directionality is determined by the chaotic ray dynamics in the open cavity.

Original languageEnglish (US)
Article number041807
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume80
Issue number4
DOIs
StatePublished - Oct 20 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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