Abstract

The relationship between lasing threshold and quality ($Q$) factor is investigated. When a deformed microcavity laser composed of a circular arc and an isosceles trapezoid is excited by current injection, various modes lase in ten emission directions. The lasing modes are classified into four groups, and the lasing threshold of each mode group is obtained according to emission spectra. The $Q$ factor of each mode group is obtained from the resonance by comparing the far-field patterns of resonances with those of mode groups. Through the study, we find that the lasing threshold strongly depends on the $Q$ factor.

© 2014 Optical Society of America

Directional single mode emission in a microcavity laser

Myung-Woon Kim, Chang-Hwan Yi, Sunghwan Rim, Chil-Min Kim, Jong-Hoi Kim, and Kwang-Ryung Oh
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Lasing of scarred mode near above threshold in a semiconductor microcavity laser

In-Goo Lee, Chang-Hwan Yi, Ji-Won Lee, Jinhyeok Ryu, Sunjae Gwak, Kwang-Ryong Oh, and Chil-Min Kim
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Analysis of broad emission direction in a spiral-shaped microcavity laser

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Chaos-assisted tunneling in a deformed microcavity laser

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Unidirectional emission of high-Q scarred modes in a rounded D-shape microcavity

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Opt. Express 26(26) 34864-34871 (2018)