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Selective excitation of lowest-order transverse ring modes in a quasi-stadium laser diode

Takehiro Fukushima, Susumu Shinohara, Satoshi Sunada, Takahisa Harayama, Kenichi Arai, Koichiro Sakaguchi, and Yasunori Tokuda

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Abstract

For a two-dimensional quasi-stadium laser diode, we demonstrate stable excitation of the lowest-order transverse ring modes by optimally designing the confocal end mirrors of the laser cavity based on extended Fox–Li mode calculations. We observe kink-free light output versus injection current characteristics and highly directional single-peak emissions corresponding to the diamond-shaped trajectory in the cavity. These results provide convincing evidence for selective excitation of the lowest-order transverse modes.

© 2013 Optical Society of America

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