Lowest-order axial and ring mode lasing in confocal quasi-stadium laser diodes |
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| Authors: | Fukushima Takehiro Sunada Satoshi Harayama Takahisa Sakaguchi Koichiro Tokuda Yasunori |
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| Affiliation: | Department of Information and Communication Engineering, Okayama Prefectural University, Soja, Okayama, Japan. fuku@c.oka‐pu.ac.jp |
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| Abstract: | We investigated the lasing modes of quasi-stadium laser diodes that have confocal cavity geometries, with stripe electrode contacts formed either along the cavity axis or a diamond-shaped trajectory. It was clearly demonstrated that by using narrow electrode contact patterns of 2 μm width, the lowest-order axial and ring modes were excited selectively. On the other hand, the second-lowest-order axial and ring modes were excited by using broad electrode patterns of 14 μm width. Experimentally obtained far-field patterns for lasers with broad and narrow electrode contact patterns agree very well with the simulation results obtained using an extended Fox-Li mode calculation method. |
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